umap/docs/dev/overview.md

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# Overview of uMap
uMap is a server and a client. The server is build with the Django framework, and the client uses (vanilla) JavaScript, on top of Leaflet.
Basically, here is how it works:
- Most of the data is stored as [geoJSON files](https://geojson.org/), on the server.
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- Some other parts of the data is stored in the database (users, permissions, etc)
- PostGIS is used for some of its geo features, but for the most part, the computation is done on the frontend with Leaflet.
The server is meant to be a simple layer to do the storage and serve the JavaScript.