> the wms images are epsg:3857 (if I remember the correct value) the map > ist epsg:4326 > Actually, the WMS is EPSG:4326, too. Strange...
So it doesn't seem to make sense to build perpendicular buildings in the > above mentioned projection, so that I see in the osm map perpendicular > buildings. > > Not specifically, no. If you set the projection to mercator, it could be just square enough to use something like the rectangle tool with a negligeable error margin. The important thing is to fit the nodes to the corner of the buildings as much as possible, whatever the projection is. But really, on the screenshot you sent me, every pixel is worth 66 centimeter (the "ppm" on the status bar = pixels per meter), so the error of drawing square is really nothing in comparison to even the point where you place your nodes ;-) - Chris -
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