If your GIS system is based on the Python/Django/DRF/PostGIS stack, it is very common to perform geometry format conversions between its different layers. This short article includes a cheat-sheet of the most common conversions needed.

On a previous article called "OpenStreetMap to GeoJSON", I explained how to extract Polygons from OSM using an online tool provided by from OSM France. And, on this article, I’ll explain how do that yourself directly using the OSM API and Python.

This also explains the basic concepts I used to write the osmexp tool, to export OSM elements into GeoJSON from the command-line.

This is a fun example of how to use Shapely to solve geographical problems. On this article I show how to cover a polygon with circles in a hexagonal pattern.