Thanks. I have tried to use the hilite tool. As you can see, I used it to get the roofs of the buildings. When I use the Convert area tool, I get the result in the first image, which is far from what I wanted. As you might guess, looking at the red hilites, I want to automatically get the outline (outer boundaries) of the buildings. That way I will now have the hilites represented by polygons and I can go on to add the roads. I need to use this for an area much larger than this
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