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.

Did you ever change your mind about your Django database structure? Sometimes you need to create references between models, but for some reason you didn’t use a ForeignKey field, and there are good cases for that, for example: the ID came from a different system, but you decided to have a local copy. On this article I show how to convert it the proper way.

Arrays in PostgreSQL are very useful to represent lists of data without the need of extra “many-to-many” tables, but to take advantage of them, you need to know the basics; follow this article to learn them.

When working with remote sensing, it is very common to save time data in a single timezone (usually UTC), this article shows how to convert that into local time based on the provided coordinates.

New platforms, new technologies and new risks! Here are my predictions for 2024 in relation to development. Nothing in this article is guaranteed to happen, but I rank them as very likely.

If you want to combine the power of Rust with the free-style research orientation of Jupyter notebooks, try using the Rust kernel on it; this allows for an easy prospective approach, making it very similar to Python.

Sometimes when dealing with coordinates, you may need to work in meters instead of degrees, but, since we don’t live in a flat earth, the calculation is not trivial. Thankfully, there are tools to help with the conversions.

Use OpenStreetMap as your repository of geometries, and export them in the more convenient GeoJSON format. This technique only works with geometries with area (Polygon and MultiPolygon), points and lines break the exporting tool used here.

The JSON format is the backbone of current Internet protocols and APIs, and this article contains a list of tools to make a better use of it from the command-line, without the need of writing complex programs to read, search, parse, transform and transmit JSON data.