OpenStreetMap 開放街圖
Mapping buildings with roofs at different levels from awkward angles
於 2018年二月 9日 由 Horza 以English發表。 上一次更新在 2018年二月10日。This building can only be seen in the Esri imagery and that is from an awkward angle. How do I mark out the outline of this building accurately?
Edit: Building at 53.46, -2.23. Corner of Burleigh Street and Denmark Road
2nd Edit. Guess I should have mentioned. The east half of the building is taller than the west half. That’s where the problem is. Sorry.
討論
由 Glassman 於 2018年02月 9日 20時55分 發表的評論
Best practice would be to map the roof line accurately then move the outline to match what you can see where the building sits on the ground.
由 andy mackey 於 2018年02月 9日 21時25分 發表的評論
Have you looked here osm.wiki/Roof_modelling
由 Horza 於 2018年02月10日 12時02分 發表的評論
Andy: Yes, this is the relevant bit osm.wiki/Roof_modelling#Modelling_of_outlines_of_building_with_different_heights
That only works if you can see where the two different sections of roof meet though.
Glassman: That’s what I’d usually do, but the west half of the building is about half the height of the east half, which I guess I should have mentioned in the diary, anyway…
I’ve used that to get an approximate mapping for now. I mapped the east half of the building, moved it halfway down, then mapped the west, then moved it the rest of the way to the ground. I go near here occasionally so I’ll take a small diversion and count floors at some point.