What's that?

What's that? 

Well, this is automatic vegetation (includes housing) from LIDAR data. Streets/fields are easy to be seen.
Formula used is the following: divide fields in 5x5m grid. Count the points that are < 0.5 meters, < 4 meters and rest. Then look at ratio of points between 0.5 and 4 meters divided by all points < 4 meters.
If ratio is > 0.5, all green, if > 0.3 - very green, if > 0.1 - somewhat green. If there are high points (> 4 meters), then make it a forest.