OpenStreetMap
Mapping buildings with roofs at different levels from awkward angles
ߊ߬ ߟߊߦߟߍ߬ߣߍ߲߬ ߦߋ߫ Horza ߓߟߏ߫ 9 February 2018 ߦߋ߫ English ߟߋ߬ ߘߐ߫ ߟߊ߬ߞߎ߬ߘߦߊ߬ߟߌ߬ ߞߐߟߕߊ 10 February 2018 ߘߐ߫This 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
ߡߙߌߣߊ߲ ߞߊ߬ ߝߘߊ߫ Glassman ߟߊ߫ 9 February 2018 at 20:55 ߘߐ߫
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.
ߡߙߌߣߊ߲ ߞߊ߬ ߝߘߊ߫ andy mackey ߟߊ߫ 9 February 2018 at 21:25 ߘߐ߫
Have you looked here osm.wiki/Roof_modelling
ߡߙߌߣߊ߲ ߞߊ߬ ߝߘߊ߫ Horza ߟߊ߫ 10 February 2018 at 12:02 ߘߐ߫
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.