Hi, char...@cferrero.net wrote:
This is a major issue when tracing tower blocks - the taller the building the more the roof appears to be displaced relative to the floor due to the perspective of the plane taking the photos. I have always tried to map the base because, ultimately, a map is a representation of what's at ground-level. If you mapped roofs you'd get very tall buildings overlapping the surrounding roads.
Sometimes I map the roof to get a good idea of the shape, then move the result to match the base.
It would be interesting to have editor support for estimating the building height depending on that displacement, or depending on the extent of the shadow - that would have to be calibrated for each imagery and location of course but so does the displacement of the whole image, and we're seeing people working on the latter...
Bye Frederik -- Frederik Ramm ## eMail frede...@remote.org ## N49°00'09" E008°23'33" _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
