Kevin Samples wrote: > Be aware that buildings may appear to be shifted in comparison to the > Yahoo aerial images or any aerial imagery, but actually are not. In > aerial photography any structure that has hight will exhibit parallax > (sometime drastically) and will appear to be tilted away from the center > of the image (central perspective). If buildings are drawn from any > aerial photograph, the building should be traced from it's base where it > has contact with the earth in order for it to be properly aligned on the > map. > > Kevin > I concur with Kevin - make sure you're not sketching the roof of tall buildings. Another thing I've come across is where the shadows these high rises cast have been sketch as a part of the building. Personally I only map entities I'm familiar with so I have a rough idea of the floor plan.
Dave F. _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
