I largely agree with Yaro, but will say 1) It is possible to square almost square angles with JOSM - it has an informational warning in validation, and automatically squares the angle by slightly moving the offending node. This fix doesn't ruin the geometry of the building, as pressing Q so often does. Unfortunately, it also leads to other angles in the building not being square. 3) I'm fine with importing smaller buildings as well (they don't seem to be in the source data in Toronto, they are for some of the other data sets). I believe they were excluded because of their relatively low importance/permanence.
I would also like to know how the Toronto building footprints were produced. Does anyone know? DannyMcD
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