This is the part of Osmose which analyses OSM and sends the results to the frontend. This works as follows:

• an .osm.pbf extraction is downloaded
• analyses are run directly on the .osm.pbf file, or on the database
• results of the analyses are uploaded to the frontend
• by default, the database is purged

Analysers can be build in many ways:

• With MapCSS rules validating each OSM objects: plugins/*.mapcss and JOSM MapCSS core and some contrib rules.
• With Python code validating each OSM objects: plugins.
• With SQL/PostGIS queries on the Osmosis database: analysers/analyser_osmosis_*.py.
• By configuring a comparator of OpenData and OSM objects: analysers/analyser_merge_*.py.

The default way to setup Osmose Backend is through Docker. Look at the docker/README.md.

You can also install manually on a debian distribution INSTALL.md.

Look at the osmose_run.py help for options

osmose_run.py -h

Setup a Docker install and follow the "Develop on Osmose with docker" guide.

Read the additional contribution guidelines.