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Re: [osm-nyc] question about drawing building footprints

From: Maxim R.
Sent on: Wednesday, July 31, 2013 10:18 PM
Frank, one very important tip when drawing buildings is to make sure you align them to baseline, not their rooftops. This will ensure that polygons are positioned where they supposed to be rather than skewed if imagery was taken at an angle. With single-story building it's not as noticeable, but with taller buildings margin of error will increase.

On Wed, Jul 31, 2013 at 8:19 PM, fkh <[address removed]> wrote:
Hello NYCOSMers!

I'm starting to add building footprints for my neighborhood in Brooklyn, and until the city's own footprint data is licensed more favorably (soon, I hear), I'm going to add them manually from the aerial image. 

Has anyone come across a good tutorial about drawing buildings? 

I see there are some tools in JOSM that will be useful (e.g., but I'd rather use the ID map editor. Before I dive in, any tips?


Frank Hebbert
OpenPlans | | [masked] | @fkh

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