Greetings from right here at City and County of San Francisco. The past week I’ve been extracting just buildings, flattening building polygons, and have a summary of ground and first-return elevations for each building.

City and County would like to leverage OSM excellence, yet OSM licensing restrictions make it not feasible for us to use these OSM shapes as our own public reference set. We’re keenly interested in having buildings that contain their addresses along with elevation and height; we don’t have those just yet.

We have reference surfaces for ground and for LiDAR first return prepared at 50cm gridding, but the ortho-derived alignment of many nicely shaped OSM buildings is presenting challenges for their height assignment.

I’ll add more in the individual effort wiki pages.