osmexp - OpenStreetMap GeoJSON Exporter

The OSM API uses a specific format for their geometric primitive types based on nodes, ways and relations; and those unfortunately don’t translate 1:1 with GeoJSON types, thus a conversion is needed.

Installation:

Make sure you have at least Python 3.11, and install it with:

$ pip install osmexp

The only requirements are Requests and Shapely.

Usage

For all exports, this is the format:

$ osmexp [element_type] [element_id]

Where element_type can be node, way or rel (for "relation"). And the ID is the numerical identifier used by OSM, if you don’t know how to get the OSM ID, follow this article.

The output is set to STDOUT, and it is recommended to be piped into a file or another command. On failure, an error message is sent to STDERR and the process exits with a non-zero status.

Exporting Nodes:

$ osmexp node 9589344640 > outdoor_seating.geojson

This returns a GeoJSON with a Point as a root type.

Exporting Ways:

$ osmexp way 398987317 > canal_grande.geojson

This returns a GeoJSON with a LineString as a root type if the line is “open” or Polygon if the line is “closed”.

Exporting Relations:

$ osmexp rel 4817103 > venice.geojson

This returns a GeoJSON with a FeatureCollection as a root, and the internal features as LineString or Polygon, depending if they can self-close, or fail the polygon transformation by other means (self crossing, etc).

Development

Clone the repository and install in editable mode with the dev extras (tests, linter):

$ pip install -e '.[dev]'

All dependencies are declared in pyproject.toml; there are no separate requirements files.

Run the test suite (it replays recorded HTTP responses, so no network is needed):

$ pytest

Lint and format with Ruff:

$ ruff check .
$ ruff format .

License

This library is released under the 3-Clause BSD License.

tl;dr: "free to use as long as you credit me".