The threshold for squaring angles in iD is currently set to within +/-12 degrees of right or straight. This number was just chosen because it “feels” right, and still allows for buildings to have 15 degree angles and circular sections. https://github.com/openstreetmap/iD/issues/1902 <https://github.com/openstreetmap/iD/issues/1902>
The squaring algorithm is borrowed from Potlatch, and has some known odd edge cases that I would like to improve when I have time for it. https://github.com/openstreetmap/iD/issues/2472 <https://github.com/openstreetmap/iD/issues/2472> My advice for tracing buildings with better precision is to 1. use a mouse and 2. zoom in more. People very new to mapping often forget that zooming in makes it much easier to trace in detail. Thanks, Bryan > Bryan, Thanks for your great work on the iD Editor. The new mappers whom I > have introduced to OSM through mapathons often comment about how easy the > process is! > > A related issue with regards to the current squaring functionality is that iD > apparently will only square a building if it is already close to being > square. During mapathons we instruct mappers to draw the building and then > hit 's' to square. Most of them follow directions, but the result is often > buildings that are not square because the tool didn't do anything, and didn't > warn the user that it wasn't doing anything. We now try to explain that they > have to check to make sure the tool did something, and if not, attempt to > redraw the building and click 's' again.... but that is more details for them > to handle, remember and execute. > > Mike
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