diff --git a/2018i.png b/2018i.png
deleted file mode 100644
index 1015b3d..0000000
--- a/2018i.png
+++ /dev/null
Binary files differ
diff --git a/2020d.png b/2020d.png
new file mode 100644
index 0000000..91885fe
--- /dev/null
+++ b/2020d.png
Binary files differ
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f635526..ac774a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,41 @@
+## 2020d
+
+### Zone Changes
+
+* Update some Canadian zones as follows ([#90](https://github.com/evansiroky/timezone-boundary-builder/issues/90))
+  * Use OSM timezone relations in entirety for the following zones: `America/Blanc_Sablon`, `America/Glace_Bay`, `America/Halifax`, `America/Swift_Current`, `America/Toronto`
+* Add disputed area along Northwest Bhutan-China border.
+* Manually add back the Jungholz Village to `Europe/Vienna` ([#93](https://github.com/evansiroky/timezone-boundary-builder/issues/93)).
+* Update to latest OSM data
+
+### Other Changes
+
+* Switch command line flag processing to use the yargs library. Existing flags have changed: ``--no-validation` and ``--filtered-zones` have been renamed to ``--skip_validation` and `--included_zones` respectively. `--included_zones` now takes a list without quotes or commas.
+* Addition of new flags: `--excluded_zones`, `--dist_dir`, `--downloads_dir`, `--skip_analyze_diffs`, `--skip_shapefile`, `--skip_zip`. See `--help` and README.md for details.
+* Remove unneeded downloaded files from downloads directory before creating input data zipfile ([#82](https://github.com/evansiroky/timezone-boundary-builder/issues/82)).
+* Junk directory names when zipping data for releases
+* Add ability to generate a difference of the zone boundaries between the current config and the latest release. ([#83](https://github.com/evansiroky/timezone-boundary-builder/issues/83)).
+
+## 2020a
+
+### Zone Changes
+
+* Allow timezones `Asia/Tbilisi` and `Europe/Moscow` to overlap
+* Rename `America/Godthab` to `America/Nuuk` ([#77](https://github.com/evansiroky/timezone-boundary-builder/issues/77))
+* Update some Canadian zones as follows ([#76](https://github.com/evansiroky/timezone-boundary-builder/issues/76))
+  * Make Listuguj part of `America/Halifax` instead of `America/Moncton`
+  * Make `America/Nipigon` comprise of most of mid-Ontario. _Credit to OSM user [Arctic gnome](https://www.openstreetmap.org/user/Arctic%20gnome) for OSM edits._
+  * Make `America/Rainy_River` comprise of the Westernmost parts of Ontario bordering Manitoba. _Credit to OSM user [Arctic gnome](https://www.openstreetmap.org/user/Arctic%20gnome) for OSM edits._
+  * Split Northwest Territories timezones (`America/Inuvik` and `America/Yellowknife`) in two using 120th meridian
+  * Make `America/Swift_Current` comprise of all areas in southwest Saskatchewan between the `America/Regina` and `America/Edmonton` timezones.
+  * Split Yukon timezones (`America/Dawson` and `America/Whitehorse`) in two using 138th meridian
+* Update to latest OSM data
+
+### Other Changes
+
+* Update packages to latest versions
+* Include input data in release files ([#78](https://github.com/evansiroky/timezone-boundary-builder/issues/78))
+
 ## 2019b
 
 ### Zone Changes
diff --git a/README.md b/README.md
index 6986de6..0b2e1f5 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,9 @@
 
 The goal of this project is to produce a shapefile with the boundaries of the world's timezones using OpenStreetMap data.
 
-<p align="center"><img src="2018i.png" /></p>
+<p align="center"><img src="2020d.png" /></p>
 
-[![Github downloads for all releases](https://img.shields.io/github/downloads/evansiroky/timezone-boundary-builder/total.svg)](https://www.somsubhra.com/github-release-stats/?username=evansiroky&repository=timezone-boundary-builder)  [![GitHub release](https://img.shields.io/github/release/evansiroky/timezone-boundary-builder.svg)](https://github.com/evansiroky/timezone-boundary-builder/releases/latest)
+[![Github downloads for all releases](https://img.shields.io/github/downloads/evansiroky/timezone-boundary-builder/total.svg)](https://tooomm.github.io/github-release-stats/?username=evansiroky&repository=timezone-boundary-builder)  [![GitHub release](https://img.shields.io/github/release/evansiroky/timezone-boundary-builder.svg)](https://github.com/evansiroky/timezone-boundary-builder/releases/latest)
 
 
 ## Shapefiles and data
@@ -30,11 +30,12 @@
 | [Timeshape](https://github.com/RomanIakovlev/timeshape) | Java |
 | [node-geo-tz](https://github.com/evansiroky/node-geo-tz/) | JavaScript (node.js only) |
 | [timespace](https://github.com/mapbox/timespace) | JavaScript (node.js and in browser) |
-| [tz-lookup](https://github.com/darkskyapp/tz-lookup/) | JavaScript (node.js and in browser) |
+| [tz-lookup](https://github.com/darkskyapp/tz-lookup-oss) | JavaScript (node.js and in browser) |
 | [GeoTimezone](https://github.com/mj1856/GeoTimeZone) | .NET |
 | [Geo-Timezone](https://github.com/minube/geo-timezone) | php |
 | [timezonefinder](https://github.com/MrMinimal64/timezonefinder) | Python |
 | [lutz](https://github.com/ateucher/lutz) | R |
+| [wheretz](https://github.com/zverok/wheretz) | Ruby |
 
 Another common way to use the data for lookup purposes is to load the shapefile into a spatially-aware database.  See this [blog post](https://simonwillison.net/2017/Dec/12/location-time-zone-api/) for an example of how that can be done.
 
@@ -51,17 +52,48 @@
 **Run the script to generate timezones for only specified timezones.**
 
 ```shell
-node --max-old-space-size=8192 index.js --filtered-zones "America/New_York,America/Chicago"
+node --max-old-space-size=8192 index.js --included_zones America/New_York America/Chicago
 ```
 
+**Run the script to generate timezones while excluding specified timezones.**
+
+```shell
+node --max-old-space-size=8192 index.js --excluded_zones America/New_York America/Chicago
+```
+
+**Run the script with custom working / output directories.**
+
+timezone-boundary-builder downloads boundaries from OpenStreetMap and places them in the `./downloads` directory by default. It generates output files in the `./dist` directory by default.
+
+If you want to use different directories, you can do so with the `--downloads_dir` and `--dist_dir` flags.
+
+```shell
+node --max-old-space-size=8192 index.js --downloads_dir ./downloads2 --dist_dir ./dist2
+```
+
+**Other command line flags**
+
+Other command line flags:
+
+  + `--help` - show some basic usage information
+  + `--skip_analyze_diffs` - do not analyze differences between the current output and another version
+  + `--skip_shapefile` - do not create the shapefile from the geojson file
+  + `--skip_validation` - do not validate the time zone boundaries
+  + `--skip_zip` - do not zip the generated geojson files
+
+
 ### What the script does
 
-There are three config files that describe the boundary building process.  The `osmBoundarySources.json` file lists all of the needed boundaries to extract via queries to the Overpass API.  The `timezones.json` file lists all of the timezones and various operations to perform to build the boundaries.  The `expectedZoneOverlaps.json` file lists all timezones that are allowed to overlap each other and the acceptable bounds of a particular overlap.  
+There are three config files that describe the boundary building process.  The `osmBoundarySources.json` file lists all of the needed boundaries to extract via queries to the Overpass API.  The `timezones.json` file lists all of the timezones and various operations to perform to build the boundaries.  The `expectedZoneOverlaps.json` file lists all timezones that are allowed to overlap each other and the acceptable bounds of a particular overlap.
 
-The `index.js` file downloads all of the required geometries, builds the specified geometries, validates that there aren't large areas of overlap (other than those that are expected), outputs one huge geojson file, and finally zips up the geojson file using the `zip` cli and also converts the geojson to a shapefile using the `ogr2ogr` cli.  The script has only been verified to run with Node.js 10 on the MacOS platform.
+The `index.js` file downloads all of the required geometries, builds the specified geometries, validates that there aren't large areas of overlap (other than those that are expected), analyzes the difference between the current output and the last release, outputs one huge geojson file, and finally zips up the geojson file using the `zip` cli and also converts the geojson to a shapefile using the `ogr2ogr` cli.  The script has only been verified to run with Node.js 10 on the MacOS platform.
 
 The code does query the publicly available Overpass API, but it self-throttles the making of requests to have a minimum of 4 seconds gap between requests.  If the Overpass API throttles the download, then the gap will be increased exponentially.
 
+The validation and difference analysis can take a really long time to compute. If these tasks are not needed, be sure to add the `--skip_analyze_diffs` and `--skip_validation` flags.
+
+As of release 2020a, it is possible to run the script with the underlying input data that was used to build the timezone geometries at the time of the release. In the release files, the `input-data.zip` will have all of the necessary input data including the downloaded files from overpass, the `timezones.json` file and the `osmBoundarySources.json` file as well.
+
 ## Limitations of this project
 
 The data is almost completely comprised of OpenStreetMap data which is editable by anyone.  There are a few guesses on where to draw an arbitrary border in the open waters and a few sparsely inhabited areas.  Some uninhabited islands are omitted from this project.  This project does include timezones in the oceans, but strictly uses territorial waters or Etc/GMT timezones instead of unofficially observed areas such as Exclusive Economic Zones.
diff --git a/android/README.md b/android/README.md
new file mode 100644
index 0000000..62e440a
--- /dev/null
+++ b/android/README.md
@@ -0,0 +1,69 @@
+This directory contains Android's additions to timezone-boundary-builder
+project.
+
+Directories:
+
+`android_inputs/`
+  - Files downloaded from upstream to seed `android_downloads/`
+
+`android_downloads/`
+  - The .json files used to generate the output. Equivalent to upstream's
+    `downloads/` directory.
+
+`android_dist/`
+  - The generated output files. Equivalent to upstream's `dist/` directory.
+
+`tools/`
+  - Scripts used to execute the timezone-boundary-builder generation process.
+
+Android initially intends to use the time zone boundary file, `combined.json`,
+released by upstream. Therefore, this copy of timezone-boundary-builder may be
+unnecessary until / unless Android wants to make local modifications.
+
+-----
+
+The `combined.json` generation process:
+
+Execute `android/tools/host/clear_android_data_files.sh` to clear out most
+working files and reset the local environment.
+
+Before running the generation process, decide if you want to use the same input
+files as have been used by upstream.
+
+Upstream make the files used available in a file called `input-files.zip`, which
+can be downloaded and unpacked into the `android/android_downloads/` directory
+using `android/tools/host/download_input_files.sh`.
+
+When not using upstream's input files, the generation process will first
+download boundary data from OpenStreetMap, which is slow. Because OpenStreetMap
+is constantly evolving, the latest features downloaded will usually have issues
+that need to be fixed before proceeding. The script can be restarted multiple
+times and will usually restart downloads from where it failed last time.
+
+Local edits to input files may be necessary to make adjustments needed for
+Android in future.
+
+timezone-boundary-builder requires the nodejs runtime for execution with various
+dependencies, so Android's `android/tools/host/run_tzbb.sh` uses a Docker
+container to setup the runtime environment in a repeatable manner.
+
+Execute `android/tools/host/run_tzbb.sh --help` to see options.
+
+The following can be used to speed up generation times:
+
+```
+      --skip_analyze_diffs  Skip analysis of diffs between versions    [boolean]
+      --skip_shapefile      Skip shapefile creation                    [boolean]
+      --skip_validation     Skip validation                            [boolean]
+```
+
+After executing `android/tools/host/run_tzdbb.sh`, in `android/android_dist/`
+there will be many .json files alongside (a newly generated) `input-files.zip`
+and `combined.json` that constitute the main output files.
+
+The contents of `android/android_downloads/` and `android/android_dist/` can be
+committed to form a full record of how the latest output file was generated.
+
+The `combined.json` and `input-files.zip` can be passed to the new step of the
+reference data generation pipeline, which is held in a separate git project.
+
diff --git a/android/tools/container/run_tzbb.sh b/android/tools/container/run_tzbb.sh
new file mode 100755
index 0000000..5e4d9da
--- /dev/null
+++ b/android/tools/container/run_tzbb.sh
@@ -0,0 +1,27 @@
+#!/bin/bash -x
+
+# Copyright 2021 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+if [ -z $DOCKER ]; then
+  echo Run this inside the docker container.
+  exit 1;
+fi
+
+cd /timezone-boundary-builder
+npm root
+npm install
+npm audit fix
+
+node --max-old-space-size=8192 index.js $*
diff --git a/android/tools/host/Dockerfile b/android/tools/host/Dockerfile
new file mode 100644
index 0000000..72e0d79
--- /dev/null
+++ b/android/tools/host/Dockerfile
@@ -0,0 +1,15 @@
+FROM node:12
+ARG userid
+ARG groupid
+ARG username
+ARG tzbbroot
+
+RUN apt-get update && apt-get install -y gdal-bin zip
+
+# Set up the user so that files are owned by the proper user
+RUN groupadd -g $groupid $username \
+ && useradd -m -u $userid -g $groupid $username
+RUN mkdir -p $tzbbroot && chown $userid $tzbbroot
+ENV DOCKER=true
+USER $username
+
diff --git a/android/tools/host/clear_android_data_files.sh b/android/tools/host/clear_android_data_files.sh
new file mode 100755
index 0000000..be59d8b
--- /dev/null
+++ b/android/tools/host/clear_android_data_files.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+
+# Copyright 2021 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Fail fast on any error.
+set -e
+
+HOST_TOOLS_DIR=$(realpath $(dirname $0))
+source ${HOST_TOOLS_DIR}/common.sh
+
+DIRS=(\
+  ${HOST_INPUTS_DIR}\
+  ${HOST_DOWNLOADS_DIR}\
+  ${HOST_DIST_DIR}\
+)
+
+for DIR in ${DIRS[@]}; do
+  echo Deleting content of ${DIR}
+  rm -f ${DIR}/*
+  # Just in case
+  mkdir -p ${DIR}
+done
+
diff --git a/android/tools/host/common.sh b/android/tools/host/common.sh
new file mode 100755
index 0000000..cf9896a
--- /dev/null
+++ b/android/tools/host/common.sh
@@ -0,0 +1,37 @@
+# Copyright 2021 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+if [[ -z "${HOST_TOOLS_DIR}" ]]; then
+  echo HOST_TOOLS_DIR not set
+  exit 1
+fi
+
+# The android_ prefix is to get around the upstream project's .gitignore rules
+# for dist / downloads. Android will want to commit them to version control to
+# improve change tracking / repeatability and avoid unnecessary load on OSM
+# servers.
+INPUTS_DIR=android_inputs
+DOWNLOADS_DIR=android_downloads
+DIST_DIR=android_dist
+
+CONTAINER_ANDROID_DIR=./android
+CONTAINER_DOWNLOADS_DIR=${CONTAINER_ANDROID_DIR}/${DOWNLOADS_DIR}
+CONTAINER_DIST_DIR=${CONTAINER_ANDROID_DIR}/${DIST_DIR}
+
+HOST_ANDROID_DIR=${HOST_TOOLS_DIR}/../..
+HOST_ANDROID_DIR=$(realpath ${HOST_ANDROID_DIR})
+HOST_INPUTS_DIR=${HOST_ANDROID_DIR}/${INPUTS_DIR}
+HOST_DOWNLOADS_DIR=${HOST_ANDROID_DIR}/${DOWNLOADS_DIR}
+HOST_DIST_DIR=${HOST_ANDROID_DIR}/${DIST_DIR}
+
diff --git a/android/tools/host/download_input_files.sh b/android/tools/host/download_input_files.sh
new file mode 100755
index 0000000..821c6b3
--- /dev/null
+++ b/android/tools/host/download_input_files.sh
@@ -0,0 +1,106 @@
+#!/bin/bash
+
+# Copyright 2021 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Fail fast on any error.
+set -e
+
+HOST_TOOLS_DIR=$(realpath $(dirname $0))
+source ${HOST_TOOLS_DIR}/common.sh
+
+RELEASE_ID=${1}
+if [ -z ${RELEASE_ID} ]; then
+  echo "Usage:"
+  echo "  ${0} <release ID>"
+  echo
+  echo "e.g. ${0} 2020d"
+  exit 1
+fi
+
+SCRIPT_PATH=$(realpath $0)
+
+# -f = report failures
+# -L = follow redirects
+CURL_CMD="curl -f -L"
+
+TZBB_PROJECT_URL=https://github.com/evansiroky/timezone-boundary-builder/
+SERVER_RELEASE_BASE_URL=${TZBB_PROJECT_URL}releases/download
+SERVER_SOURCE_BASE_URL=https://raw.githubusercontent.com/evansiroky/timezone-boundary-builder/master
+
+INPUT_DATA_FILE=input-data.zip
+LICENSE_FILE=DATA_LICENSE
+
+function download() {
+  set -e
+  SERVER_BASE_URL=${1}
+  FILE_NAME=${2}
+  LOCAL_DIR=${3}
+
+  URL=${SERVER_BASE_URL}/${FILE_NAME}
+  LOCAL_FILE_NAME=${LOCAL_DIR}/${FILE_NAME}
+  echo Downloading ${FILE_NAME} from ${URL}...
+  ${CURL_CMD} ${URL} --output ${LOCAL_FILE_NAME}
+
+  DOWNLOAD_DATE=$(date)
+  SHA=$(sha1sum ${LOCAL_FILE_NAME} | awk '{ print $1}')
+
+  # Add a METADATA file URL entry for every file we download.
+  cat << EOF >> ${METADATA_FILE}
+  url {
+    type: OTHER
+    value: "${FILE_NAME} downloaded from ${URL} on ${DOWNLOAD_DATE}, SHA1=${SHA}"
+  }
+EOF
+}
+
+mkdir -p ${HOST_INPUTS_DIR}
+echo Removing existing data files...
+rm -f ${HOST_INPUTS_DIR}/*
+
+METADATA_FILE=${HOST_INPUTS_DIR}/METADATA
+# Start the METADATA file
+cat << EOF > ${METADATA_FILE}
+// Generated file DO NOT EDIT
+// Run download_input_files.sh
+name: "android_inputs"
+description:
+    "Assorted files downloaded from ${TZBB_PROJECT_URL}"
+
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "${TZBB_PROJECT_URL}"
+  }
+EOF
+
+download ${SERVER_SOURCE_BASE_URL} ${LICENSE_FILE} ${HOST_INPUTS_DIR}
+download ${SERVER_RELEASE_BASE_URL}/${RELEASE_ID} ${INPUT_DATA_FILE} ${HOST_INPUTS_DIR}
+
+PROTO_UPGRADE_DATE=$(date +'{ year: '%Y' month: '%-m' day: '%-d' }')
+
+# Finish the METADATA file
+cat << EOF >> ${METADATA_FILE}
+  version: "${RELEASE_ID}"
+  last_upgrade_date ${PROTO_UPGRADE_DATE}
+  license_type: RESTRICTED
+}
+EOF
+
+ln -sr ${HOST_INPUTS_DIR}/DATA_LICENSE ${HOST_INPUTS_DIR}/LICENSE
+
+# Handle the unzip step to HOST_DOWNLOADS_DIR
+unzip -d ${HOST_DOWNLOADS_DIR} ${HOST_INPUTS_DIR}/${INPUT_DATA_FILE}
+
+echo Look in ${HOST_INPUTS_DIR} for input files....
diff --git a/android/tools/host/run_process_in_docker.sh b/android/tools/host/run_process_in_docker.sh
new file mode 100755
index 0000000..bdb615a
--- /dev/null
+++ b/android/tools/host/run_process_in_docker.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# Copyright 2021 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+HOST_TOOLS_DIR=$(realpath $(dirname $0))
+CONTAINER_TOOLS_DIR=$(realpath $HOST_TOOLS_DIR/../container)
+TZBB_ROOT=$(realpath $HOST_TOOLS_DIR/../../..)
+
+DOCKER_USERNAME=$(id -un)
+DOCKER_UID=$(id -u)
+DOCKER_GID=$(id -g)
+
+echo "This may need your sudo password in order to access docker:"
+set -x
+sudo docker build --build-arg userid=$DOCKER_UID --build-arg groupid=$DOCKER_GID --build-arg username=$DOCKER_USERNAME --build-arg tzbbroot=$TZBB_ROOT -t android-tzbb .
+sudo docker run -it --rm -v $TZBB_ROOT:/timezone-boundary-builder android-tzbb $*
+set +x
+
diff --git a/android/tools/host/run_tzbb.sh b/android/tools/host/run_tzbb.sh
new file mode 100755
index 0000000..4c30453
--- /dev/null
+++ b/android/tools/host/run_tzbb.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# Copyright 2021 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+HOST_TOOLS_DIR=$(realpath $(dirname $0))
+source ${HOST_TOOLS_DIR}/common.sh
+
+${HOST_TOOLS_DIR}/run_process_in_docker.sh /timezone-boundary-builder/android/tools/container/run_tzbb.sh \
+  --downloads_dir ${CONTAINER_DOWNLOADS_DIR} \
+  --dist_dir ${CONTAINER_DIST_DIR} \
+  --skip_zip \
+  --skip_shapefile \
+  $*
diff --git a/expectedZoneOverlaps.json b/expectedZoneOverlaps.json
index d00c82b..9a71459 100644
--- a/expectedZoneOverlaps.json
+++ b/expectedZoneOverlaps.json
@@ -72,6 +72,9 @@
     {
       "bounds": [88.9, 27.2, 89.2, 27.7],
       "description": "Allow disputed area near Doklam to overlap (See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam)"
+    }, {
+      "bounds": [90.7, 27.8, 91.4, 28.1],
+      "description": "Allow disputed area along Northwest Bhutan-China border to overlap (See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE)"
     }
   ],
   "Asia/Shanghai-Asia/Urumqi": [
@@ -80,6 +83,15 @@
       "description": "Xinjiang time might be used by some locals in Xinjiang.  https://en.wikipedia.org/wiki/Xinjiang_Time"
     }
   ],
+  "Asia/Tbilisi-Europe/Moscow": [
+    {
+      "bounds": [39.8, 42.4, 42.2, 43.6],
+      "description": "Allow overlap of state of Abkhazia using Moscow time with Georgian time.  https://en.wikipedia.org/wiki/Abkhazia"
+    }, {
+      "bounds": [43.3, 42.8, 43.5, 42.9],
+      "description": "Allow overlap of minimal areas at mountaintops due to likely mismatching OSM boundaries that should probably be fixed in OSM."
+    }
+  ],
   "Europe/Amsterdam-Europe/Berlin": [
     {
       "bounds": [6.3, 53.3, 7.2, 53.8],
diff --git a/index.js b/index.js
index 72b367b..0caf598 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,6 @@
 var exec = require('child_process').exec
 var fs = require('fs')
+var path = require('path')
 
 var area = require('@mapbox/geojson-area')
 var geojsonhint = require('@mapbox/geojsonhint')
@@ -8,26 +9,85 @@
 var multiPolygon = helpers.multiPolygon
 var polygon = helpers.polygon
 var asynclib = require('async')
+var https = require('follow-redirects').https
 var jsts = require('jsts')
 var rimraf = require('rimraf')
 var overpass = require('query-overpass')
+var yargs = require('yargs')
 
-const ProgressStats = require('./progressStats')
+const FeatureWriterStream = require('./util/featureWriterStream')
+const ProgressStats = require('./util/progressStats')
 
 var osmBoundarySources = require('./osmBoundarySources.json')
 var zoneCfg = require('./timezones.json')
 var expectedZoneOverlaps = require('./expectedZoneOverlaps.json')
 
-// allow building of only a specified zones
-var filteredIndex = process.argv.indexOf('--filtered-zones')
-let filteredZones = []
-if (filteredIndex > -1 && process.argv[filteredIndex + 1]) {
-  filteredZones = process.argv[filteredIndex + 1].split(',')
-  var newZoneCfg = {}
-  filteredZones.forEach((zoneName) => {
-    newZoneCfg[zoneName] = zoneCfg[zoneName]
+const argv = yargs
+  .option('downloads_dir', {
+    description: 'Set the download location',
+    default: './downloads',
+    type: 'string'
   })
-  zoneCfg = newZoneCfg
+  .option('dist_dir', {
+    description: 'Set the dist location',
+    default: './dist',
+    type: 'string'
+  })
+  .option('excluded_zones', {
+    description: 'Exclude specified zones',
+    type: 'array'
+  })
+  .option('included_zones', {
+    description: 'Include specified zones',
+    type: 'array'
+  })
+  .option('skip_analyze_diffs', {
+    description: 'Skip analysis of diffs between versions',
+    type: 'boolean'
+  })
+  .option('skip_shapefile', {
+    description: 'Skip shapefile creation',
+    type: 'boolean'
+  })
+  .option('skip_validation', {
+    description: 'Skip validation',
+    type: 'boolean'
+  })
+  .option('skip_zip', {
+    description: 'Skip zip creation',
+    type: 'boolean'
+  })
+  .help()
+  .strict()
+  .alias('help', 'h')
+  .argv
+
+// Resolve the arguments with paths so relative paths become absolute.
+const downloadsDir = path.resolve(argv.downloads_dir)
+const distDir = path.resolve(argv.dist_dir)
+
+// allow building of only a specified zones
+let includedZones = []
+let excludedZones = []
+if (argv.included_zones || argv.excluded_zones) {
+  if (argv.included_zones) {
+    const newZoneCfg = {}
+    includedZones = argv.included_zones
+    includedZones.forEach((zoneName) => {
+      newZoneCfg[zoneName] = zoneCfg[zoneName]
+    })
+    zoneCfg = newZoneCfg
+  }
+  if (argv.excluded_zones) {
+    const newZoneCfg = {}
+    excludedZones = argv.excluded_zones
+    Object.keys(zoneCfg).forEach((zoneName) => {
+      if (!excludedZones.includes(zoneName)) {
+        newZoneCfg[zoneName] = zoneCfg[zoneName]
+      }
+    })
+    zoneCfg = newZoneCfg
+  }
 
   // filter out unneccessary downloads
   var newOsmBoundarySources = {}
@@ -47,8 +107,10 @@
 var precisionModel = new jsts.geom.PrecisionModel(1000000)
 var precisionReducer = new jsts.precision.GeometryPrecisionReducer(precisionModel)
 var distZones = {}
+var lastReleaseJSONfile
 var minRequestGap = 4
 var curRequestGap = 4
+const bufferDistance = 0.01
 
 var safeMkdir = function (dirname, callback) {
   fs.mkdir(dirname, function (err) {
@@ -60,7 +122,13 @@
   })
 }
 
-var debugGeo = function (op, a, b, reducePrecision) {
+var debugGeo = function (
+  op,
+  a,
+  b,
+  reducePrecision,
+  bufferAfterPrecisionReduction
+) {
   var result
 
   if (reducePrecision) {
@@ -88,8 +156,23 @@
     }
   } catch (e) {
     if (e.name === 'TopologyException') {
-      console.log('Encountered TopologyException, retry with GeometryPrecisionReducer')
-      return debugGeo(op, a, b, true)
+      if (reducePrecision) {
+        if (bufferAfterPrecisionReduction) {
+          console.log('Encountered TopologyException, retry with buffer increase')
+          return debugGeo(
+            op,
+            a.buffer(bufferDistance),
+            b.buffer(bufferDistance),
+            true,
+            bufferAfterPrecisionReduction
+          )
+        } else {
+          throw new Error('Encountered TopologyException after reducing precision')
+        }
+      } else {
+        console.log('Encountered TopologyException, retry with GeometryPrecisionReducer')
+        return debugGeo(op, a, b, true, bufferAfterPrecisionReduction)
+      }
     }
     console.log('op err')
     console.log(e)
@@ -153,7 +236,7 @@
   } else {
     query += 'relation'
   }
-  var boundaryFilename = './downloads/' + boundaryId + '.json'
+  var boundaryFilename = downloadsDir + '/' + boundaryId + '.json'
   var debug = 'getting data for ' + boundaryId
   var queryKeys = Object.keys(cfg)
 
@@ -261,7 +344,7 @@
 }
 
 var getTzDistFilename = function (tzid) {
-  return './dist/' + tzid.replace(/\//g, '__') + '.json'
+  return distDir + '/' + tzid.replace(/\//g, '__') + '.json'
 }
 
 /**
@@ -276,7 +359,7 @@
 var getDataSource = function (source) {
   var geoJson
   if (source.source === 'overpass') {
-    geoJson = require('./downloads/' + source.id + '.json')
+    geoJson = require(downloadsDir + '/' + source.id + '.json')
   } else if (source.source === 'manual-polygon') {
     geoJson = polygon(source.data).geometry
   } else if (source.source === 'manual-multipolygon') {
@@ -573,8 +656,11 @@
   { tzid: 'Etc/GMT+12', left: -180, right: -172.5 }
 ]
 
-if (filteredZones.length > 0) {
-  oceanZones = oceanZones.filter(oceanZone => filteredZones.indexOf(oceanZone) > -1)
+if (includedZones.length > 0) {
+  oceanZones = oceanZones.filter(oceanZone => includedZones.indexOf(oceanZone) > -1)
+}
+if (excludedZones.length > 0) {
+  oceanZones = oceanZones.filter(oceanZone => excludedZones.indexOf(oceanZone) === -1)
 }
 
 var addOceans = function (callback) {
@@ -613,59 +699,241 @@
 }
 
 var combineAndWriteZones = function (callback) {
-  var stream = fs.createWriteStream('./dist/combined.json')
-  var streamWithOceans = fs.createWriteStream('./dist/combined-with-oceans.json')
+  const regularWriter = new FeatureWriterStream(distDir + '/combined.json')
+  const oceanWriter = new FeatureWriterStream(distDir + '/combined-with-oceans.json')
   var zones = Object.keys(zoneCfg)
 
-  stream.write('{"type":"FeatureCollection","features":[')
-  streamWithOceans.write('{"type":"FeatureCollection","features":[')
-
-  for (var i = 0; i < zones.length; i++) {
-    if (i > 0) {
-      stream.write(',')
-      streamWithOceans.write(',')
-    }
-    var feature = {
+  zones.forEach(zoneName => {
+    const feature = {
       type: 'Feature',
-      properties: { tzid: zones[i] },
-      geometry: geomToGeoJson(getDistZoneGeom(zones[i]))
+      properties: { tzid: zoneName },
+      geometry: geomToGeoJson(getDistZoneGeom(zoneName))
     }
     const stringified = JSON.stringify(feature)
-    stream.write(stringified)
-    streamWithOceans.write(stringified)
-  }
+    regularWriter.add(stringified)
+    oceanWriter.add(stringified)
+  })
   oceanZoneBoundaries.forEach(boundary => {
-    streamWithOceans.write(',')
     var feature = {
       type: 'Feature',
       properties: { tzid: boundary.tzid },
       geometry: boundary.geom
     }
-    streamWithOceans.write(JSON.stringify(feature))
+    oceanWriter.add(JSON.stringify(feature))
   })
   asynclib.parallel([
-    cb => {
-      stream.end(']}', cb)
-    },
-    cb => {
-      streamWithOceans.end(']}', cb)
-    }
+    cb => regularWriter.end(cb),
+    cb => oceanWriter.end(cb)
   ], callback)
 }
 
+var downloadLastRelease = function (cb) {
+  // download latest release info
+  https.get(
+    {
+      headers: { 'user-agent': 'timezone-boundary-builder' },
+      host: 'api.github.com',
+      path: '/repos/evansiroky/timezone-boundary-builder/releases/latest'
+    },
+    function (res) {
+      var data = ''
+      res.on('data', function (chunk) {
+        data += chunk
+      })
+      res.on('end', function () {
+        data = JSON.parse(data)
+        // determine last release version name and download link
+        const lastReleaseName = data.name
+        lastReleaseJSONfile = `./dist/${lastReleaseName}.json`
+        let lastReleaseDownloadUrl
+        for (var i = 0; i < data.assets.length; i++) {
+          if (data.assets[i].browser_download_url.indexOf('timezones-with-oceans.geojson') > -1) {
+            lastReleaseDownloadUrl = data.assets[i].browser_download_url
+          }
+        }
+        if (!lastReleaseDownloadUrl) {
+          return cb(new Error('geojson not found'))
+        }
+
+        // check for file that got downloaded
+        fs.stat(lastReleaseJSONfile, function (err) {
+          if (!err) {
+            // file found, skip download steps
+            return cb()
+          }
+          // file not found, download
+          console.log(`Downloading latest release to ${lastReleaseJSONfile}.zip`)
+          https.get({
+            headers: { 'user-agent': 'timezone-boundary-builder' },
+            host: 'github.com',
+            path: lastReleaseDownloadUrl.replace('https://github.com', '')
+          }, function (response) {
+            var file = fs.createWriteStream(`${lastReleaseJSONfile}.zip`)
+            response.pipe(file)
+            file.on('finish', function () {
+              file.close((err) => {
+                if (err) return cb(err)
+                // unzip file
+                console.log('unzipping latest release')
+                exec(
+                  `unzip -o ${lastReleaseJSONfile} -d dist`,
+                  err => {
+                    if (err) { return cb(err) }
+                    console.log('unzipped file')
+                    console.log('moving unzipped file')
+                    // might need to change this after changes to how files are
+                    // zipped after 2020a
+                    fs.copyFile(
+                      path.join(
+                        'dist',
+                        'dist',
+                        'combined-with-oceans.json'
+                      ),
+                      lastReleaseJSONfile,
+                      cb
+                    )
+                  }
+                )
+              })
+            })
+          }).on('error', cb)
+        })
+      })
+    }
+  )
+}
+
+var analyzeChangesFromLastRelease = function (cb) {
+  // load last release data into memory
+  console.log('loading previous release into memory')
+  const lastReleaseData = require(lastReleaseJSONfile)
+
+  // load each feature's geojson into JSTS format and then organized by tzid
+  const lastReleaseZones = {}
+  lastReleaseData.features.forEach(
+    feature => {
+      lastReleaseZones[feature.properties.tzid] = feature
+    }
+  )
+
+  // generate set of keys from last release and current
+  const zoneNames = new Set()
+  Object.keys(distZones).forEach(zoneName => zoneNames.add(zoneName))
+  Object.keys(lastReleaseZones).forEach(zoneName => zoneNames.add(zoneName))
+
+  // create diff for each zone
+  const analysisProgress = new ProgressStats(
+    'Analyzing diffs',
+    zoneNames.size
+  )
+  const additionsWriter = new FeatureWriterStream(distDir + '/additions.json')
+  const removalsWriter = new FeatureWriterStream(distDir + '/removals.json')
+  zoneNames.forEach(zoneName => {
+    analysisProgress.beginTask(zoneName, true)
+    if (distZones[zoneName] && lastReleaseZones[zoneName]) {
+      // some zones take forever to diff unless they are buffered, so buffer by
+      // just a small amount
+      const lastReleaseGeom = geoJsonToGeom(
+        lastReleaseZones[zoneName].geometry
+      ).buffer(bufferDistance)
+      const curDataGeom = getDistZoneGeom(zoneName).buffer(bufferDistance)
+
+      // don't diff equal geometries
+      if (curDataGeom.equals(lastReleaseGeom)) return
+
+      // diff current - last = additions
+      const addition = debugGeo(
+        'diff',
+        curDataGeom,
+        lastReleaseGeom,
+        false,
+        true
+      )
+      if (addition.getArea() > 0.0001) {
+        additionsWriter.add(JSON.stringify({
+          type: 'Feature',
+          properties: { tzid: zoneName },
+          geometry: geomToGeoJson(addition)
+        }))
+      }
+
+      // diff last - current = removals
+      const removal = debugGeo(
+        'diff',
+        lastReleaseGeom,
+        curDataGeom,
+        false,
+        true
+      )
+      if (removal.getArea() > 0.0001) {
+        removalsWriter.add(JSON.stringify({
+          type: 'Feature',
+          properties: { tzid: zoneName },
+          geometry: geomToGeoJson(removal)
+        }))
+      }
+    } else if (distZones[zoneName]) {
+      additionsWriter.add(JSON.stringify({
+        type: 'Feature',
+        properties: { tzid: zoneName },
+        geometry: geomToGeoJson(getDistZoneGeom(zoneName))
+      }))
+    } else {
+      removalsWriter.add(JSON.stringify(lastReleaseZones[zoneName]))
+    }
+  })
+
+  // write files
+  asynclib.parallel([
+    wcb => additionsWriter.end(wcb),
+    wcb => removalsWriter.end(wcb)
+  ], cb)
+}
+
 const autoScript = {
   makeDownloadsDir: function (cb) {
     overallProgress.beginTask('Creating downloads dir')
-    safeMkdir('./downloads', cb)
+    safeMkdir(downloadsDir, cb)
   },
   makeDistDir: function (cb) {
     overallProgress.beginTask('Creating dist dir')
-    safeMkdir('./dist', cb)
+    safeMkdir(distDir, cb)
   },
   getOsmBoundaries: ['makeDownloadsDir', function (results, cb) {
     overallProgress.beginTask('Downloading osm boundaries')
     asynclib.eachSeries(Object.keys(osmBoundarySources), downloadOsmBoundary, cb)
   }],
+  cleanDownloadFolder: ['makeDistDir', 'getOsmBoundaries', function (results, cb) {
+    overallProgress.beginTask('cleanDownloadFolder')
+    const downloadedFilenames = Object.keys(osmBoundarySources).map(name => `${name}.json`)
+    fs.readdir(downloadsDir, (err, files) => {
+      if (err) return cb(err)
+      asynclib.each(
+        files,
+        (file, fileCb) => {
+          if (downloadedFilenames.indexOf(file) === -1) {
+            return fs.unlink(path.join(downloadsDir, file), fileCb)
+          }
+          fileCb()
+        },
+        cb
+      )
+    })
+  }],
+  zipInputData: ['cleanDownloadFolder', function (results, cb) {
+    overallProgress.beginTask('Zipping up input data')
+    exec('zip -j ' + distDir + '/input-data.zip ' + downloadsDir +
+         '/* timezones.json osmBoundarySources.json expectedZoneOverlaps.json', cb)
+  }],
+  downloadLastRelease: ['makeDistDir', function (results, cb) {
+    if (argv.skip_analyze_diffs) {
+      overallProgress.beginTask('WARNING: Skipping download of last release for analysis!')
+      cb()
+    } else {
+      overallProgress.beginTask('Downloading last release for analysis')
+      downloadLastRelease(cb)
+    }
+  }],
   createZones: ['makeDistDir', 'getOsmBoundaries', function (results, cb) {
     overallProgress.beginTask('Creating timezone boundaries')
     asynclib.each(Object.keys(zoneCfg), makeTimezoneBoundary, cb)
@@ -673,7 +941,7 @@
   validateZones: ['createZones', function (results, cb) {
     overallProgress.beginTask('Validating timezone boundaries')
     loadDistZonesIntoMemory()
-    if (process.argv.indexOf('no-validation') > -1) {
+    if (argv.skip_validation) {
       console.warn('WARNING: Skipping validation!')
       cb()
     } else {
@@ -689,32 +957,60 @@
     combineAndWriteZones(cb)
   }],
   zipGeoJson: ['mergeZones', function (results, cb) {
+    if (argv.skip_zip) {
+      overallProgress.beginTask('Skipping zip')
+      return cb()
+    }
     overallProgress.beginTask('Zipping geojson')
-    exec('zip dist/timezones.geojson.zip dist/combined.json', cb)
+    const zipFile = distDir + '/timezones.geojson.zip'
+    const jsonFile = distDir + '/combined.json'
+    exec('zip -j ' + zipFile + ' ' + jsonFile, cb)
   }],
   zipGeoJsonWithOceans: ['mergeZones', function (results, cb) {
+    if (argv.skip_zip) {
+      overallProgress.beginTask('Skipping with oceans zip')
+      return cb()
+    }
     overallProgress.beginTask('Zipping geojson with oceans')
-    exec('zip dist/timezones-with-oceans.geojson.zip dist/combined-with-oceans.json', cb)
+    const zipFile = distDir + '/timezones-with-oceans.geojson.zip'
+    const jsonFile = distDir + '/combined-with-oceans.json'
+    exec('zip -j ' + zipFile + ' ' + jsonFile, cb)
   }],
   makeShapefile: ['mergeZones', function (results, cb) {
+    if (argv.skip_shapefile) {
+      overallProgress.beginTask('Skipping shapefile creation')
+      return cb()
+    }
     overallProgress.beginTask('Converting from geojson to shapefile')
-    rimraf.sync('dist/combined-shapefile.*')
+    const shapeFileGlob = distDir + '/combined-shapefile.*'
+    rimraf.sync(shapeFileGlob)
+    const shapeFile = distDir + '/combined-shapefile.shp'
+    const jsonFile = distDir + '/combined.json'
     exec(
-      'ogr2ogr -f "ESRI Shapefile" dist/combined-shapefile.shp dist/combined.json',
+      'ogr2ogr -f "ESRI Shapefile" ' + shapeFile + ' ' + jsonFile,
       function (err, stdout, stderr) {
         if (err) { return cb(err) }
-        exec('zip dist/timezones.shapefile.zip dist/combined-shapefile.*', cb)
+        const shapeFileZip = distDir + '/timezones.shapefile.zip'
+        exec('zip -j ' + shapeFileZip + ' ' + shapeFileGlob, cb)
       }
     )
   }],
   makeShapefileWithOceans: ['mergeZones', function (results, cb) {
+    if (argv.skip_shapefile) {
+      overallProgress.beginTask('Skipping with oceans shapefile creation')
+      return cb()
+    }
     overallProgress.beginTask('Converting from geojson with oceans to shapefile')
-    rimraf.sync('dist/combined-shapefile-with-oceans.*')
+    const shapeFileGlob = distDir + '/combined-shapefile-with-oceans.*'
+    rimraf.sync(shapeFileGlob)
+    const shapeFile = distDir + '/combined-shapefile-with-oceans.shp'
+    const jsonFile = distDir + '/combined-with-oceans.json'
     exec(
-      'ogr2ogr -f "ESRI Shapefile" dist/combined-shapefile-with-oceans.shp dist/combined-with-oceans.json',
+      'ogr2ogr -f "ESRI Shapefile" ' + shapeFile + ' ' + jsonFile,
       function (err, stdout, stderr) {
         if (err) { return cb(err) }
-        exec('zip dist/timezones-with-oceans.shapefile.zip dist/combined-shapefile-with-oceans.*', cb)
+        const shapeFileZip = distDir + '/timezones-with-oceans.shapefile.zip'
+        exec('zip -j ' + shapeFileZip + ' ' + shapeFileGlob, cb)
       }
     )
   }],
@@ -724,15 +1020,27 @@
     oceanZones.forEach(oceanZone => {
       zoneNames.push(oceanZone.tzid)
     })
-    if (filteredZones.length > 0) {
-      zoneNames = zoneNames.filter(zoneName => filteredZones.indexOf(zoneName) > -1)
+    if (includedZones.length > 0) {
+      zoneNames = zoneNames.filter(zoneName => includedZones.indexOf(zoneName) > -1)
+    }
+    if (excludedZones.length > 0) {
+      zoneNames = zoneNames.filter(zoneName => excludedZones.indexOf(zoneName) === -1)
     }
     fs.writeFile(
-      'dist/timezone-names.json',
+      distDir + '/timezone-names.json',
       JSON.stringify(zoneNames),
       cb
     )
-  }
+  },
+  analyzeChangesFromLastRelease: ['downloadLastRelease', 'mergeZones', function (results, cb) {
+    if (argv.skip_analyze_diffs) {
+      overallProgress.beginTask('WARNING: Skipping analysis of changes from last release!')
+      cb()
+    } else {
+      overallProgress.beginTask('Analyzing changes from last release')
+      analyzeChangesFromLastRelease(cb)
+    }
+  }]
 }
 
 const overallProgress = new ProgressStats('Overall', Object.keys(autoScript).length)
diff --git a/osmBoundarySources.json b/osmBoundarySources.json
index 405c3e0..6768f1c 100644
--- a/osmBoundarySources.json
+++ b/osmBoundarySources.json
@@ -8,6 +8,9 @@
   "基伍地区": {
     "name": "基伍地区"
   },
+  "中国实控白玉地区": {
+    "name:zh": "中国实控白玉地区"
+  },
   "שטח B": {
     "name:he": "שטח B"
   },
@@ -144,6 +147,9 @@
   "Bir Tawil": {
     "alt_name:en": "Bi'r Tawīl"
   },
+  "Blanc Sablon-tz": {
+    "timezone": "America/Blanc-Sablon"
+  },
   "Bledsoe County, TN": {
     "name": "Bledsoe County",
     "nist:state_fips": "47"
@@ -222,9 +228,6 @@
   "Cancun-tz": {
     "timezone": "America/Cancun"
   },
-  "Cape Breton County": {
-    "name": "Cape Breton County"
-  },
   "Cape Verde": {
     "ISO3166-1": "CV"
   },
@@ -293,9 +296,6 @@
   "Corrientes": {
     "ISO3166-2": "AR-W"
   },
-  "Coral Harbour-tz": {
-    "timezone": "America/Coral_Harbour"
-  },
   "Corson County, SD": {
     "name": "Corson County",
     "nist:state_fips": "46"
@@ -314,7 +314,7 @@
     "nist:state_fips": "18"
   },
   "Creston-tz": {
-    "timezone": "America/Creston"
+    "name": "America/Creston"
   },
   "Crimea": {
     "name:en": "Republic of Crimea"
@@ -365,8 +365,8 @@
   "Djibouti": {
     "ISO3166-1": "DJ"
   },
-  "Doklam 洞郎地区": {
-    "name": "Doklam 洞郎地区"
+  "Doklam 洞朗地区": {
+    "name": "Doklam 洞朗地区"
   },
   "Dominica": {
     "ISO3166-1": "DM"
@@ -427,6 +427,10 @@
   "Faroe Islands": {
     "ISO3166-1": "FO"
   },
+  "Fentress County, TN": {
+    "name": "Fentress County",
+    "nist:state_fips": "47"
+  },
   "Fiji": {
     "ISO3166-1": "FJ"
   },
@@ -466,6 +470,10 @@
     "name": "Gibson County",
     "nist:state_fips": "18"
   },
+  "Glace Bay-tz": {
+    "boundary": "timezone",
+    "name": "America/Glace_Bay Timezone"
+  },
   "Gogebic County": {
     "name": "Gogebic County"
   },
@@ -518,6 +526,9 @@
   "Haiti": {
     "ISO3166-1": "HT"
   },
+  "Halifax-tz": {
+    "timezone": "America/Halifax"
+  },
   "Hamilton County, KS": {
     "name": "Hamilton County",
     "nist:state_fips": "20"
@@ -944,10 +955,6 @@
   "Omsk": {
     "ISO3166-2": "RU-OMS"
   },
-  "Overton County, TN": {
-    "name": "Overton County",
-    "nist:state_fips": "47"
-  },
   "Oymyakonsky": {
     "name:en": "Oymyakonsky Ulus"
   },
@@ -1039,6 +1046,9 @@
   "Queensland": {
     "ISO3166-2": "AU-QLD"
   },
+  "Rainy River-tz": {
+    "timezone": "America/Rainy_River"
+  },
   "Rankin Inlet-tz": {
     "timezone": "America/Rankin_Inlet"
   },
@@ -1248,8 +1258,9 @@
   "Sweden": {
     "ISO3166-1": "SE"
   },
-  "Swift Current": {
-    "name": "Swift Current"
+  "Swift Current-tz": {
+    "boundary": "timezone",
+    "name": "America/Swift_Current timezone"
   },
   "Switzerland": {
     "ISO3166-1": "CH"
diff --git a/package-lock.json b/package-lock.json
index e950f11..c8d64e1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,54 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
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+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
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+      "dev": true,
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
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+    },
+    "@babel/highlight": {
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+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
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+      "requires": {
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+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
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+          "dev": true,
+          "requires": {
+            "color-convert": "^1.9.0"
+          }
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+        "chalk": {
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
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       "resolved": "https://registry.npmjs.org/@mapbox/geojson-area/-/geojson-area-0.2.2.tgz",
@@ -66,45 +114,49 @@
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+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
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+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.1.tgz",
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
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+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
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+      "dev": true,
+      "requires": {
+        "type-fest": "^0.11.0"
+      },
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+        "type-fest": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
+          "integrity": "sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==",
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-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-      "dev": true
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
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@@ -121,13 +173,73 @@
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-      "integrity": "sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=",
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+      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.1.1.tgz",
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-        "define-properties": "^1.1.2",
-        "es-abstract": "^1.7.0"
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.0",
+        "is-string": "^1.0.5"
+      },
+      "dependencies": {
+        "es-abstract": {
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+          "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.7.tgz",
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+          "requires": {
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+            "function-bind": "^1.1.1",
+            "has": "^1.0.3",
+            "has-symbols": "^1.0.1",
+            "is-callable": "^1.2.2",
+            "is-regex": "^1.1.1",
+            "object-inspect": "^1.8.0",
+            "object-keys": "^1.1.1",
+            "object.assign": "^4.1.1",
+            "string.prototype.trimend": "^1.0.1",
+            "string.prototype.trimstart": "^1.0.1"
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+        "es-to-primitive": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
+          "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
+          "dev": true,
+          "requires": {
+            "is-callable": "^1.1.4",
+            "is-date-object": "^1.0.1",
+            "is-symbol": "^1.0.2"
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+        "has-symbols": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.1.tgz",
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+          "dev": true
+        },
+        "is-callable": {
+          "version": "1.2.2",
+          "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.2.2.tgz",
+          "integrity": "sha512-dnMqspv5nU3LoewK2N/y7KLtxtakvTuaCsU9FU50/QDmdbHNy/4/JuRtMHqRU22o3q+W89YQndQEeCVwK+3qrA==",
+          "dev": true
+        },
+        "is-regex": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.1.1.tgz",
+          "integrity": "sha512-1+QkEcxiLlB7VEyFtyBg94e08OAsvq7FUBgApTq/w2ymCLyKJgDPsybBENVtA7XCQEgEXxKPonG+mvYRxh/LIg==",
+          "dev": true,
+          "requires": {
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+        "object-keys": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.1.1.tgz",
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+          "dev": true
+        }
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@@ -143,10 +255,16 @@
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       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
     },
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
+      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
+      "dev": true
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-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/async/-/async-3.1.0.tgz",
-      "integrity": "sha512-4vx/aaY6j/j3Lw3fbCHNWP0pPaTCew3F6F3hYyl/tHs/ndmV1q7NW9T5yuJ2XAGwdQrP+6Wu20x06U4APo/iQQ=="
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.0.tgz",
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@@ -159,56 +277,9 @@
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@@ -251,19 +322,10 @@
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-      "dev": true,
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-      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
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@@ -282,32 +344,61 @@
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+      "dependencies": {
+        "ansi-styles": {
+          "version": "4.3.0",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+          "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+          "requires": {
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+          }
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+        "color-convert": {
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+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
+        },
+        "is-fullwidth-code-point": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+          "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
+        },
+        "string-width": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
+          "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "requires": {
+            "ansi-regex": "^5.0.0"
+          }
+        }
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "write": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
-      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
       "dev": true,
       "requires": {
         "mkdirp": "^0.5.1"
@@ -2584,14 +3397,63 @@
       }
     },
     "xmldom": {
-      "version": "0.1.27",
-      "resolved": "https://registry.npmjs.org/xmldom/-/xmldom-0.1.27.tgz",
-      "integrity": "sha1-1QH5ezvbQDr4757MIFcxh6rawOk="
+      "version": "0.1.31",
+      "resolved": "https://registry.npmjs.org/xmldom/-/xmldom-0.1.31.tgz",
+      "integrity": "sha512-yS2uJflVQs6n+CyjHoaBmVSqIDevTAWrzMmjG1Gc7h1qQ7uVozNhEPJAwZXWyGQ/Gafo3fCwrcaokezLPupVyQ=="
     },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
       "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+    },
+    "y18n": {
+      "version": "5.0.4",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.4.tgz",
+      "integrity": "sha512-deLOfD+RvFgrpAmSZgfGdWYE+OKyHcVHaRQ7NphG/63scpRvTHHeQMAxGGvaLVGJ+HYVcCXlzcTK0ZehFf+eHQ=="
+    },
+    "yargs": {
+      "version": "16.1.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.1.0.tgz",
+      "integrity": "sha512-upWFJOmDdHN0syLuESuvXDmrRcWd1QafJolHskzaw79uZa7/x53gxQKiR07W59GWY1tFhhU/Th9DrtSfpS782g==",
+      "requires": {
+        "cliui": "^7.0.2",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.0",
+        "y18n": "^5.0.2",
+        "yargs-parser": "^20.2.2"
+      },
+      "dependencies": {
+        "is-fullwidth-code-point": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+          "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
+        },
+        "string-width": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
+          "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "requires": {
+            "ansi-regex": "^5.0.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "20.2.3",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.3.tgz",
+      "integrity": "sha512-emOFRT9WVHw03QSvN5qor9QQT9+sw5vwxfYweivSMHTcAXPefwVae2FjO7JJjj8hCE4CzPOPeFM83VwT29HCww=="
     }
   }
 }
diff --git a/package.json b/package.json
index 95e407f..a83ada9 100644
--- a/package.json
+++ b/package.json
@@ -24,13 +24,15 @@
     "@mapbox/geojsonhint": "^3.0.0",
     "@turf/bbox": "^6.0.1",
     "@turf/helpers": "^6.1.4",
-    "async": "^3.1.0",
-    "jsts": "^2.0.4",
-    "query-overpass": "^1.5.3",
-    "rimraf": "^2.6.3",
-    "shpjs": "^3.4.3"
+    "async": "^3.2.0",
+    "follow-redirects": "^1.13.0",
+    "jsts": "^2.5.1",
+    "query-overpass": "^1.5.5",
+    "rimraf": "^3.0.2",
+    "shpjs": "^3.6.0",
+    "yargs": "^16.1.0"
   },
   "devDependencies": {
-    "standard": "^12.0.1"
+    "standard": "^14.3.4"
   }
 }
diff --git a/timezones.json b/timezones.json
index b908e7f..fdecc81 100644
--- a/timezones.json
+++ b/timezones.json
@@ -528,15 +528,6 @@
     {
       "op": "init",
       "source": "overpass",
-      "id": "Argentina"
-    }, {
-      "op": "intersect",
-      "source": "manual-polygon",
-      "data": [[[-60,-23],[-59,-32],[-50,-24],[-60,-23]]],
-      "description": "Intersect with a long section of the Paraná and Uruguay Rivers because there were holes.  Whatever OSM thinks Uruguay's border is will be diffed as the last operation for this zone."
-    }, {
-      "op": "union",
-      "source": "overpass",
       "id": "Córdoba"
     }, {
       "op": "union",
@@ -566,10 +557,6 @@
       "op": "union",
       "source": "overpass",
       "id": "Formosa"
-    }, {
-      "op": "difference",
-      "source": "overpass",
-      "id": "Uruguay"
     }
   ],
   "America/Argentina/Jujuy": [
@@ -693,10 +680,6 @@
       "op": "init",
       "source": "overpass",
       "id": "Paraguay"
-    }, {
-      "op": "difference",
-      "source": "overpass",
-      "id": "Argentina"
     }
   ],
   "America/Atikokan": [
@@ -705,10 +688,6 @@
       "source": "overpass",
       "id": "Atikokan-tz"
     }, {
-      "op": "union",
-      "source": "overpass",
-      "id": "Coral Harbour-tz"
-    }, {
       "op": "difference",
       "source": "overpass",
       "id": "Iqaluit-tz"
@@ -762,17 +741,7 @@
     {
       "op": "init",
       "source": "overpass",
-      "id": "Quebec"
-    }, {
-      "op": "intersect",
-      "source": "manual-polygon",
-      "data": [[[-61.25,53],[-61.25,48],[-51,53],[-61.25,53]]],
-      "description": "Grab eastern section of Quebec"
-    }, {
-      "op": "difference",
-      "source": "manual-polygon",
-      "data": [[[-58.9,46.8],[-63.37,47.66],[-60.4768198,48.7813802],[-58.9,46.8]]],
-      "description": "Exclude a section of area that should be America/Halifax"
+      "id": "Blanc Sablon-tz"
     }
   ],
   "America/Boa_Vista": [
@@ -928,7 +897,7 @@
     }, {
       "op": "union",
       "source": "overpass",
-      "id": "Overton County, TN"
+      "id": "Fentress County, TN"
     }, {
       "op": "union",
       "source": "overpass",
@@ -1148,9 +1117,13 @@
   "America/Dawson": [
     {
       "op": "init",
+      "source": "overpass",
+      "id": "Yukon"
+    }, {
+      "op": "difference",
       "source": "manual-polygon",
-      "data": [[[-139.446, 64.0893], [-139.4126, 64.0888], [-139.4105, 64.0688], [-139.3765, 64.0609], [-139.3758, 64.0556], [-139.2775, 64.0534], [-139.2854, 64.0208], [-139.4496, 64.0278], [-139.4546, 64.0254], [-139.4824, 64.0219], [-139.4838, 64.0314], [-139.4738, 64.034], [-139.4747, 64.0369], [-139.4737, 64.0404], [-139.4713, 64.0419], [-139.4677, 64.0469], [-139.4663, 64.0487], [-139.4572, 64.0515], [-139.4538, 64.0546], [-139.4417, 64.0736], [-139.4476, 64.0789], [-139.4477, 64.0807], [-139.44, 64.0819], [-139.446, 64.0893]]],
-      "description": "Manually create polygon based off of best guess of city limits of Dawson as shown in this map: http://dawson.planyukon.ca/index.php/the-dawson-region/resource-maps/6-01-regional-overview-map/file"
+      "data": [[[-138,75],[-138,56],[-95,62],[-138,75]]],
+      "description": "Difference against a manually created polygon to create an east-west split at the 138th meridian."
     }
   ],
   "America/Dawson_Creek": [
@@ -1316,38 +1289,7 @@
     {
       "op": "init",
       "source": "overpass",
-      "id": "Canada"
-    }, {
-      "op": "intersect",
-      "source": "manual-polygon",
-      "data": [[[-58,46],[-59,45.428],[-60.1323124,45.7017791],[-60.3408651,46.3601573],[-60.0238,46.5],[-58,46]]],
-      "description": "intersect part of Canada in Cape Breton County to preserve terriritorial waters"
-    }, {
-      "op": "union",
-      "source": "overpass",
-      "id": "Cape Breton County"
-    }
-  ],
-  "America/Godthab": [
-    {
-      "op": "init",
-      "source": "overpass",
-      "id": "Greenland"
-    }, {
-      "op": "difference",
-      "source": "manual-polygon",
-      "data": [[[-24,72.4],[-19,71],[-18,70],[-25,70.5],[-24,72.4]]],
-      "description": "Exclude area from Greenland used to make America/Scoresbysund"
-    }, {
-      "op": "difference",
-      "source": "manual-polygon",
-      "data": [[[-24.2,73.5],[-15,71.8],[-14,77],[-24.2,73.5]]],
-      "description": "Exclude area from Greenland used to make America/Danmarkshavn"
-    }, {
-      "op": "difference",
-      "source": "manual-polygon",
-      "data": [[[-81,82],[-60,78],[-81,60],[-81,82]]],
-      "description": "Exclude area from Greenland used to make America/Thule"
+      "id": "Glace Bay-tz"
     }
   ],
   "America/Goose_Bay": [
@@ -1421,21 +1363,7 @@
     {
       "op": "init",
       "source": "overpass",
-      "id": "Canada"
-    }, {
-      "op": "intersect",
-      "source": "manual-polygon",
-      "data": [[[-58.9,46.8],[-60.0238,46.5],[-60.3408651,46.3601573],[-60.1323124,45.7017791],[-59,45.428],[-59,34],[-67,44.06],[-66.4878,44.482],[-66.21,44.83],[-65.3,45.2],[-65.13,45.38],[-64.98,45.47],[-64.80607,45.5364896],[-64.5,46],[-63.7491191,46.2295464],[-64.34,46.36],[-64.56,46.6],[-64.58,46.69],[-64.46,47.07],[-63.37,47.66],[-60.4768198,48.7813802],[-60.4037717,47.7610985],[-58.9,46.8]]],
-      "description": "Grab area of Canada including New Brunswick and an area of the Gulf of St Lawrence including Prince Edward Island and the Magdalen Islands"
-    }, {
-      "op": "difference",
-      "source": "overpass",
-      "id": "Cape Breton County"
-    }, {
-      "op": "difference",
-      "source": "overpass",
-      "id": "New Brunswick",
-      "description": "Exclude New Brunswick to get exact boundary between Nova Scotia and New Brunswick"
+      "id": "Halifax-tz"
     }
   ],
   "America/Havana": [
@@ -1525,9 +1453,13 @@
   "America/Inuvik": [
     {
       "op": "init",
+      "source": "overpass",
+      "id": "Northwest Territories"
+    }, {
+      "op": "difference",
       "source": "manual-polygon",
-      "data": [[[-133.7991, 68.4161], [-133.73, 68.4165], [-133.7297, 68.3955], [-133.6343, 68.3464], [-133.3888, 68.3166], [-133.3843, 68.2982], [-133.4485, 68.297], [-133.4482, 68.2901], [-133.4719, 68.29], [-133.4726, 68.2926], [-133.4911, 68.2966], [-133.535, 68.2973], [-133.5556, 68.3015], [-133.5546, 68.3043], [-133.5653, 68.3074], [-133.6772, 68.3176], [-133.6734, 68.3226], [-133.7046, 68.3379], [-133.7225, 68.3508], [-133.7524, 68.3625], [-133.7709, 68.3749], [-133.7733, 68.3827], [-133.7695, 68.3874], [-133.775, 68.3906], [-133.7884, 68.394], [-133.7956, 68.4007], [-133.7956, 68.4092], [-133.7991, 68.4161]]],
-      "description": "This is a manual trace of what appears to be the boundary of the city limits of Inuvik.  Boundary is based off of this document: http://www.inuvik.ca/en/living-here/resources/By-laws/2582_Community_Plan_Map.pdf"
+      "data": [[[-120,85],[-120,56],[-55,62],[-120,85]]],
+      "description": "Difference against a manually created polygon to create an east-west split at the 120th meridian."
     }
   ],
   "America/Iqaluit": [
@@ -1776,27 +1708,7 @@
     {
       "op": "init",
       "source": "overpass",
-      "id": "Canada"
-    }, {
-      "op": "intersect",
-      "source": "manual-polygon",
-      "data": [[[-70,46],[-67,44.06],[-66.4878,44.482],[-66.21,44.83],[-65.3,45.2],[-65.13,45.38],[-64.98,45.47],[-64.80607,45.5364896],[-64.5,46],[-63.7491191,46.2295464],[-64.34,46.36],[-64.56,46.6],[-64.58,46.69],[-64.46,47.07],[-63.37,47.66],[-61.69,48.52],[-60,52],[-70,50],[-70,46]]],
-      "description": "Grab area of Canada around New Brunswick including part of Gulf of St Lawrence"
-    }, {
-      "op": "difference",
-      "source": "overpass",
-      "id": "Quebec",
-      "description": "Exclude Quebec territory including parts of Gulf of St Lawrence"
-    }, {
-      "op": "union",
-      "source": "overpass",
-      "id": "New Brunswick",
-      "description": "Union to get exact border between New Brunswick and Nova Scotia"
-    }, {
-      "op": "union",
-      "source": "manual-polygon",
-      "data": [[[-66.681,48.01],[-66.685,48.0158],[-66.6864,48.0166],[-66.723,48.029],[-66.7179,48.0363],[-66.7407,48.0623],[-66.733,48.0728],[-66.756,48.1022],[-66.802,48.086],[-66.754,48.0305],[-66.737,48.0274],[-66.73,48.0309],[-66.71,47.996],[-66.681,48.01]]],
-      "description": "Include terroritory belonging to Listuguj Mi'gmaq First Nation"
+      "id": "New Brunswick"
     }
   ],
   "America/Monterrey": [
@@ -1892,7 +1804,7 @@
     }, {
       "op": "difference",
       "source": "overpass",
-      "id": "Overton County, TN"
+      "id": "Fentress County, TN"
     }, {
       "op": "difference",
       "source": "overpass",
@@ -1997,6 +1909,28 @@
       "id": "Morton County, ND"
     }
   ],
+  "America/Nuuk": [
+    {
+      "op": "init",
+      "source": "overpass",
+      "id": "Greenland"
+    }, {
+      "op": "difference",
+      "source": "manual-polygon",
+      "data": [[[-24,72.4],[-19,71],[-18,70],[-25,70.5],[-24,72.4]]],
+      "description": "Exclude area from Greenland used to make America/Scoresbysund"
+    }, {
+      "op": "difference",
+      "source": "manual-polygon",
+      "data": [[[-24.2,73.5],[-15,71.8],[-14,77],[-24.2,73.5]]],
+      "description": "Exclude area from Greenland used to make America/Danmarkshavn"
+    }, {
+      "op": "difference",
+      "source": "manual-polygon",
+      "data": [[[-81,82],[-60,78],[-81,60],[-81,82]]],
+      "description": "Exclude area from Greenland used to make America/Thule"
+    }
+  ],
   "America/Ojinaga": [
     {
       "op": "init",
@@ -2090,12 +2024,7 @@
     {
       "op": "init",
       "source": "overpass",
-      "id": "Canada"
-    }, {
-      "op": "intersect",
-      "source": "manual-polygon",
-      "data": [[[-94.5402,48.7369],[-94.5405,48.69],[-94.648,48.7369],[-94.5402,48.7369]]],
-      "description": "Intersect part of Canada near Rainy River.  Includes arbitrary boundary of 2 farm roads to the east and north of the town."
+      "id": "Rainy River-tz"
     }
   ],
   "America/Rankin_Inlet": [
@@ -2122,10 +2051,6 @@
       "op": "init",
       "source": "overpass",
       "id": "Regina-tz"
-    }, {
-      "op": "difference",
-      "source": "overpass",
-      "id": "Swift Current"
     }
   ],
   "America/Resolute": [
@@ -2259,6 +2184,10 @@
       "op": "difference",
       "source": "overpass",
       "id": "Quebec"
+    }, {
+      "op": "difference",
+      "source": "overpass",
+      "id": "Glace Bay-tz"
     }
   ],
   "America/St_Kitts": [
@@ -2298,7 +2227,7 @@
     {
       "op": "init",
       "source": "overpass",
-      "id": "Swift Current"
+      "id": "Swift Current-tz"
     }
   ],
   "America/Tegucigalpa": [
@@ -2348,33 +2277,6 @@
       "op": "init",
       "source": "overpass",
       "id": "Toronto-tz"
-    }, {
-      "op": "union",
-      "source": "overpass",
-      "id": "Quebec"
-    }, {
-      "op": "difference",
-      "source": "manual-polygon",
-      "data": [[[-61.25,53],[-61.25,48],[-51,53],[-61.25,53]]],
-      "description": "Exclude part of Quebec belonging to timezone America/Blanc-Sablon."
-    }, {
-      "op": "difference",
-      "source": "manual-polygon",
-      "data": [[[-58.9,46.8],[-60.4768198,48.7813802],[-63.37,47.66],[-64,45],[-58.9,46.8]]],
-      "description": "Exclude Magdalen Islands"
-    }, {
-      "op": "difference",
-      "source": "manual-polygon",
-      "data": [[[-66.681,48.01],[-66.685,48.0158],[-66.6864,48.0166],[-66.723,48.029],[-66.7179,48.0363],[-66.7407,48.0623],[-66.733,48.0728],[-66.756,48.1022],[-66.802,48.086],[-66.754,48.0305],[-66.737,48.0274],[-66.73,48.0309],[-66.71,47.996],[-66.681,48.01]]],
-      "description": "Exclude terroritory belonging to Listuguj Mi'gmaq First Nation"
-    }, {
-      "op": "difference",
-      "source": "overpass",
-      "id": "Nipigon-tz"
-    }, {
-      "op": "difference",
-      "source": "overpass",
-      "id": "Thunder Bay-tz"
     }
   ],
   "America/Tortola": [
@@ -2412,8 +2314,8 @@
     }, {
       "op": "difference",
       "source": "manual-polygon",
-      "data": [[[-139.446, 64.0893], [-139.4126, 64.0888], [-139.4105, 64.0688], [-139.3765, 64.0609], [-139.3758, 64.0556], [-139.2775, 64.0534], [-139.2854, 64.0208], [-139.4496, 64.0278], [-139.4546, 64.0254], [-139.4824, 64.0219], [-139.4838, 64.0314], [-139.4738, 64.034], [-139.4747, 64.0369], [-139.4737, 64.0404], [-139.4713, 64.0419], [-139.4677, 64.0469], [-139.4663, 64.0487], [-139.4572, 64.0515], [-139.4538, 64.0546], [-139.4417, 64.0736], [-139.4476, 64.0789], [-139.4477, 64.0807], [-139.44, 64.0819], [-139.446, 64.0893]]],
-      "description": "Difference against a manually created polygon based off of best guess of city limits of Dawson as shown in this map: http://dawson.planyukon.ca/index.php/the-dawson-region/resource-maps/6-01-regional-overview-map/file"
+      "data": [[[-138,75],[-138,56],[-165,62],[-138,75]]],
+      "description": "Difference against a manually created polygon to create an east-west split at the 138th meridian."
     }
   ],
   "America/Winnipeg": [
@@ -2421,11 +2323,6 @@
       "op": "init",
       "source": "overpass",
       "id": "Winnipeg-tz"
-    }, {
-      "op": "difference",
-      "source": "manual-polygon",
-      "data": [[[-94.5402,48.7369],[-94.5405,48.69],[-94.648,48.7369],[-94.5402,48.7369]]],
-      "description": "Difference part of this timezone near Rainy River.  Includes arbitrary boundary of 2 farm roads to the east and north of the town."
     }
   ],
   "America/Yakutat": [
@@ -2448,8 +2345,8 @@
     }, {
       "op": "difference",
       "source": "manual-polygon",
-      "data": [[[-133.7991, 68.4161], [-133.73, 68.4165], [-133.7297, 68.3955], [-133.6343, 68.3464], [-133.3888, 68.3166], [-133.3843, 68.2982], [-133.4485, 68.297], [-133.4482, 68.2901], [-133.4719, 68.29], [-133.4726, 68.2926], [-133.4911, 68.2966], [-133.535, 68.2973], [-133.5556, 68.3015], [-133.5546, 68.3043], [-133.5653, 68.3074], [-133.6772, 68.3176], [-133.6734, 68.3226], [-133.7046, 68.3379], [-133.7225, 68.3508], [-133.7524, 68.3625], [-133.7709, 68.3749], [-133.7733, 68.3827], [-133.7695, 68.3874], [-133.775, 68.3906], [-133.7884, 68.394], [-133.7956, 68.4007], [-133.7956, 68.4092], [-133.7991, 68.4161]]],
-      "description": "This is a manual trace of what appears to be the boundary of the city limits of Inuvik.  Boundary is based off of this document: http://www.inuvik.ca/en/living-here/resources/By-laws/2582_Community_Plan_Map.pdf"
+      "data": [[[-120,85],[-120,56],[-165,62],[-120,85]]],
+      "description": "Difference against a manually created polygon to create an east-west split at the 120th meridian."
     }
   ],
   "Antarctica/Casey": [
@@ -3233,23 +3130,28 @@
     }, {
       "op": "union",
       "source": "overpass",
-      "id": "Doklam 洞郎地区",
-      "description": "Add dispuated area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
+      "id": "Doklam 洞朗地区",
+      "description": "Add disputed area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
     }, {
       "op": "union",
       "source": "overpass",
       "id": "鲁林地区",
-      "description": "Add dispuated area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
+      "description": "Add disputed area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
     }, {
       "op": "union",
       "source": "overpass",
       "id": "查马普地区",
-      "description": "Add dispuated area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
+      "description": "Add disputed area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
     }, {
       "op": "union",
       "source": "overpass",
       "id": "基伍地区",
-      "description": "Add dispuated area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
+      "description": "Add disputed area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
+    }, {
+      "op": "union",
+      "source": "overpass",
+      "id": "中国实控白玉地区",
+      "description": "Add disputed area along Northwest Bhutan-China border.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE"
     }, {
       "op": "difference",
       "source": "overpass",
@@ -3311,23 +3213,28 @@
     }, {
       "op": "union",
       "source": "overpass",
-      "id": "Doklam 洞郎地区",
-      "description": "Add dispuated area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
+      "id": "Doklam 洞朗地区",
+      "description": "Add disputed area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
     }, {
       "op": "union",
       "source": "overpass",
       "id": "鲁林地区",
-      "description": "Add dispuated area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
+      "description": "Add disputed area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
     }, {
       "op": "union",
       "source": "overpass",
       "id": "查马普地区",
-      "description": "Add dispuated area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
+      "description": "Add disputed area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
     }, {
       "op": "union",
       "source": "overpass",
       "id": "基伍地区",
-      "description": "Add dispuated area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
+      "description": "Add disputed area in Doklam.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE and https://en.wikipedia.org/wiki/Doklam"
+    }, {
+      "op": "union",
+      "source": "overpass",
+      "id": "中国实控白玉地区",
+      "description": "Add disputed area along Northwest Bhutan-China border.  See https://zh.wikipedia.org/wiki/%E4%B8%AD%E4%B8%8D%E8%BE%B9%E7%95%8C%E4%BA%89%E8%AE%AE"
     }
   ],
   "Asia/Tokyo": [
@@ -3972,6 +3879,10 @@
       "op": "init",
       "source": "overpass",
       "id": "United Kingdom"
+    }, {
+      "op": "difference",
+      "source": "overpass",
+      "id": "Isle of Man"
     }
   ],
   "Europe/Luxembourg": [
@@ -4031,6 +3942,11 @@
       "source": "overpass",
       "id": "Kirov"
     }, {
+      "op": "union",
+      "source": "manual-polygon",
+      "data": [[[46.7,52.7],[46.5,52.65],[46.7,52.65],[46.7,52.7]]],
+      "description": "Union with part of Moscow timezone along a river to cover holes between the OSM boundaries of Saratov and the Moscow timezone"
+    }, {
       "op": "difference",
       "source": "overpass",
       "id": "Saratov"
@@ -4113,6 +4029,11 @@
       "op": "union",
       "source": "overpass",
       "id": "Udmurtia"
+    }, {
+      "op": "union",
+      "source": "manual-polygon",
+      "data": [[[53.05,56.185],[53.11,56.18],[53.1,56.23],[53.05,56.185]]],
+      "description": "Union this area to add some exclaves that probably don't belong to Moscow timezone"
     }
   ],
   "Europe/San_Marino": [
diff --git a/util/featureWriterStream.js b/util/featureWriterStream.js
new file mode 100644
index 0000000..7f0e7b8
--- /dev/null
+++ b/util/featureWriterStream.js
@@ -0,0 +1,25 @@
+const fs = require('fs')
+
+class FeatureWriterStream {
+  constructor (file) {
+    this.file = file
+    this.stream = fs.createWriteStream(file)
+    this.stream.write('{"type":"FeatureCollection","features":[')
+    this.numFeatures = 0
+  }
+
+  add (stringifiedFeature) {
+    if (this.numFeatures > 0) {
+      this.stream.write(',')
+    }
+    this.stream.write(stringifiedFeature)
+    this.numFeatures++
+  }
+
+  end (cb) {
+    console.log(`Closing out file ${this.file}`)
+    this.stream.end(']}', cb)
+  }
+}
+
+module.exports = FeatureWriterStream
diff --git a/progressStats.js b/util/progressStats.js
similarity index 100%
rename from progressStats.js
rename to util/progressStats.js