Don t tag for the renderer for more details on this topic see tagging for the renderer.
Osm buildings roof.
5 about the logic of building making.
7 1 drawing of many identical buildings.
Straighten way 7 2 2 b 3.
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The way should be tagged with covered.
The way may have shared nodes with the building where it crosses the outline of the building.
Some roofs e g square buildings cannot be accurately modeled with the simple techniques described on this page.
In case of ways below the roof.
The most basic use is building yes but the value may be used to classify the type of building.
In more complex situations layer for roof ways under roof and for other objects may be required.
Building roof and building bridge even describe buildings which have except its piers no outline on the ground.
Either all ways below roof or the roof should get a layer tag.
3 drawing at the roof.
Drawing of complicated building outlines.
Additional roof shapes are suggested in s3db proposals including advanced approaches for manual modelling e g proposedrooflines or parts of osm 4d roof table.
6 function make rectangular.
Straighten not neighboring.
Note that it may be not the same as the building s current use tagged using building use.
In openstreetmap a building is a man made structure with a roof standing more or less permanently in one place.