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There's the core OSM database (plain ol' Postgres), which contains all current OSM data plus all historical edit data. This is what you change if you click 'Edi
by Doctor_Fegg 11y ago
There's the core OSM database (plain ol' Postgres), which contains all current OSM data plus all historical edit data. This is what you change if you click 'Edit' on OSM.
There's also the rendering database (PostGIS), which contains a subset of the current data, with freeform tags moved into Postgres columns, and with PostGIS geometries created from the raw OSM geodata. This is continually updated from the diffs of the core database. It's used by Mapnik (rendering code) to create the images you see on osm.org.
The proposed change is to add an hstore column to the rendering database, which will be populated with all the tags for each object from the core OSM database. This will require a complete reimport of the data.
- toomuchtodo 11y agoWhere would be a good place to start if I wanted to learn about adding additional data layers (in this case, US parcel ownership data) to OSM?
- rmc 11y agoCan you explain what you mean? The OSM data base (which you can download), doesn't have "layers". It's all just one big topologically connected pile of objects. You are free to make a local map with OSM data, and then, in your browser, or GIS software of choice, overlay anything else you want on it.
- stereo 11y agouMap is great for that: https://wiki.openstreetmap.org/wiki/UMap https://wiki.openstreetmap.org/wiki/UMap If you want to do more complicated things, try leaflet, http://leafletjs.com/ http://leafletjs.com/