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[Angela]

I was reading some of the general mapmaker forums, and I came across a thread about special techniques to do special things. I found this one that is very useful, which I'll share with you below:

Slacker's Building Alignment
I'm pretty sure someone else has thought of this ever since the last patch went through, but I may as well post it out there for kicks.
Building polygons are supposed to match the ground geometry. That's all well and good until you realize that you can't see that ground edge for most of the building on satellite. Here's a quick and dirty way to get that taken care of when it comes to very simple buildings:
1.) Map your building polygon using the roof-line of the building. Now stay with me here! I swear if a GR jumps me here there's gonna be a scrap. ;P
2.) Find the ground geometry of the building where it's visible. Corners are often perfect here. If you can see on satellite where a building corner meets the ground, then you're set!
3.) Use the "Move" tool in the polygon toolbar to move that polygon you drew aligned to the roof over to where it lines up with that edge or corner visible on satellite.
4.) Click done, and your building polygon should now be pretty aligned to the ground geometry.
Naturally, if the building has things like overhangs or other odd roof anomalies, then this approach might not be the correct one. But for really simple buildings, this will make adding 2.5D buildings a snap.

[davsot]

Wow! That's genius! :)