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invar |release|



invar only works with Mapnik2. Instructions for installing Mapnik2 can be found here. Once you have Mapnik2 installed you can install invar using pip:

pip install invar

It can be quite tricky to get Mapnik2 working within virtualenv, so it may be simpler/better to install invar in the global site-packages.



ivtile renders continous tiles of the map, such as those used by Google Maps, Open Street Map, or any other "slippy" map provider.

invar tiler sample usage:

ivtile examples/bus_stops.xml tiles 32.6 -95.6 32.00 -95.0 8 10 --process-count 2

Details of each parameter are available via:

ivtile -h


ivframe renders discontinous frames of the map centered on locations, such as an individual map for the area around each of a hundred bus stops.

ivframe rendering a single large frame to the current directory:

ivframe examples/bus_stops.xml . 32.35 -95.3 -z 11 -w 512 -t 512

ivframe supports rendering a series frames from latitude/longitude pairs in a CSV file:

ivframe map.xml output_directory --csv data.csv --name name_column  --process_count 2

Details of each parameter are available via:

ivframe -h


ivs3 pushes a collection of tiles (or anything, really) into an Amazon S3 bucket using concurrent connections (so its super-fast).

Sample usage pushing a tiles directory into a bucket called "test_bucket":

ivs3 tiles_directory test_bucket -P

You must have your Amazon Web Services access credentials defined in the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables. The -P flag makes the uploaded files public. For a complete list of flags run:

ivs3 -h

Using with TileMill

In order to use invar with TileMill you need to convert TileMill's .mml configuration and .mss styles into a Mapnik .xml file. Here is an example of how to do this:

$TILEMILL_PATH/node_modules/carto/bin/carto map.mml > map.xml

Note: some versions of TileMill (0.10.1) print debug statements to STDOUT which can mess up the output of this conversion. If you see a line at the top of your output XML file like [millstone] finished processing '/path/to/my/file' then prefix your compile command with NODE_ENV=foo which will disable these statements.


Open Street Map

Much of this application is derived from selections of the Open Street Map project--notably


invar was developed to address the needs of both @tribapps and the #hacktyler project.



Release process

  1. Ensure these files all have the correct version number:
    • docs/
  2. Tag the release: git tag -a x.y.z; git push --tags
  3. Roll out to PyPI: python sdist upload
  4. Iterate the version number in all files where it is specified. (see list above)
  5. Flag the new version for building on Read the Docs.
  6. Wait for the documentation build to finish.
  7. Flag the new release as the default documentation version.
  8. Announce the release on Twitter, etc.


Indices and tables