For generic building draw the square (or other thing), often it’s enough/select building features/ this tag is added: “building=yes” (don’t select “house” but “building”, for generic building) and add always your sources, if you map a specific features after survey, local knowledge or other sources than Bing imagery (source=Bing in ID it’s automatically added on the Changeset source under this form: “imagery_used=Bing aerial imagery when you press “save” & upload) if you need to specify an other source then click on “all tags” (or add field) if you can’t see this on the left panel press the cross, select :”source” in the menu for to add an other source…) for to draw a perfect building in ID you must draw your square and press “s” for to square the corners of this area, you can see all shortcuts you need on line with your favorite editor in this case ID when you have selected a specific feature, in this case the building and when your mouse pass over each menu …

You must see and read the beginners’ guide before start… if you are a newbie.

Thanks for your help, contributions and understanding.

Best regard.