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I've been tracing buildings using separate areas for different roof levels as recommended on the wiki. How should I go about tagging them and signifying that they belong to the same structure? Here's an example:
If I were to just paste the same tags onto each shape, it would look like there were multiples of the same building. What do I do? Should I be using some kind of relation? |
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That recommendation on the wiki is not necessarily widely accepted. I can see the interest in rendering different roof levels from those with an interest in 3-D rendering. It is acceptable to draw a single outline for the collective building. Where it is attached you could reasonably call it one building, and tag it as such. If you wish to show more detail, including the multiple roof levels, a multipolygon relation is the way to go.
That should do it. Those interested in 3D rendering will probably suggest tags for the various roof levels as well. Incomplete or contentious examples may be seen here. Thanks for the clear explanation! Am I correct in thinking that only the relation should be tagged and not the individual polygons? (as long as the tag relates to the building as a whole)
(20 Jun '11, 18:34)
Sekai
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Yes, you do not need the tags on the building ways if you have them on the relation.
(20 Jun '11, 19:10)
Gnonthgol ♦
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This multipolygon relation would be invalid because the outer rings must not share paths. See https://gis.stackexchange.com/questions/298307/invalid-multipolygon-of-valid-individual-polygons/298312 Map the building accordingly https://wiki.openstreetmap.org/wiki/Simple_3D_Buildings |
