OpenStreetMap
Mapping buildings with roofs at different levels from awkward angles
Yuzen-it-id Horza af 9 February 2018 s English Last updated on 10 February 2018.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.
Discussion
Awennit n Glassman di 9 February 2018 ɣef 20:55
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.
Awennit n andy mackey di 9 February 2018 ɣef 21:25
Have you looked here osm.wiki/Roof_modelling
Awennit n Horza di 10 February 2018 ɣef 12:02
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.