OpenStreetMap

Mapping buildings with roofs at different levels from awkward angles

Posted by Horza on 9 February 2018 in English (English)

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.

Location: Rusholme, Manchester, Greater Manchester, North West England, England, M14 5SU, United Kingdom

Comment from Glassman on 9 February 2018 at 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.

Comment from Horza on 10 February 2018 at 12:02

Andy: Yes, this is the relevant bit https://wiki.openstreetmap.org/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.

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