Tagging FAQ
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How do I tag an island inside a lake inside a park?
leisure = park
natural = water, layer = 1 ( for the lake)
leisure = park, layer= 2 for the islands.
(asked at http://lists.openstreetmap.org/pipermail/talk/2006-December/009512.html)
A recent reference has details about the use of multipolygons for this purpose. In short, select all border ways (outline and inner line) and put them together into one relation, choose the appropriate role (inner|outer) for each member of the relation. Do so multiple times for all relations. For best results start with clockwise orientation at the park, switch with each step to the core, i.e.
- 1st relation: park (1st way, clockwise) with 2nd, inner way (= water, counter-clockwise) inside
- 2nd relation: water area with a (3rd, clockwise) way inside forming the island
- ...
You are allowed to add exactly one "outer" way per multipolygon relation, but as many "inner" ways as you need, not just one. The outline tags apply to the enclosed area minus the area inside the area tagged "inner" in the corresponding relation.
Once again, don't use layers any more as this might only be true for a lake hovering over a park and the island on top, not parting the lakes waves.
Do you tag house numbers in streets? How?
House numbers are needed for routing. It is a lot of work and difficult to do right and the data has to be maintained. Currently used schema, which is still in test stage is known as Karlsruhe Schema. See Proposed_features/House_numbers/Karlsruhe_Schema for details.
