OpenStreetMap raw data for any non-trivial area comes as a massive amount of XML (or alternatively in the near future: Protobuf based binary) data.
Making a map from that data directly is possible but given the sheer amount of data to process it is usually not feasible, especially if you are only interested in a very limited set of map features (like e.g. a map highlighting all local playgrounds within walking distance)
The typical way to actually process the map data is to import into a PostGIS database first that contains it in a slightly preprocessed form already and then operating on that database for map feature retrieval.
The talk will show how to:
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