I'm trying to draw woodlands in OpenStreetMap, using Yahoo sattelite images.
JOSM editor has some plugins that try to automate the process - you have to click inside the area and the plugin finds the boundries. But the quality is pretty bad.
I'm looking for some libraries/algorithms to get good quality boundaries.
The images i'm working with look like this: http://maps.yahoo.com/#mvt=s&lat=56.907056&lon=24.597595&zoom=14