How to identify relations' land-use such as river, lake or parks?


Relations in OSM data could be Multipolygon, which represent different kind of land-uses such as lakes, rivers, forest and so on. The question is: there are not tags inside relations which can be used to identify land-uses. But, obviously, the OSM tiles can tell different land-uses. How do they do it?

Any of your reply is highly appreciated.



The multipolygon relation should contain the tags. But there is an old way of making multipolygons, where the relation tags contain only “type=multipolygon”. In that case, the tags are in the “outer” member of the relation (and there should be only one “outer” member).