.  This video shows all node found in the current open street map export. The pixels with nodes edited in the particular frame become red. The red decays over 000 frames towards either blue or green. Green pixels have expoentially more nodes than blue ones.  This video shows all node found in the current open street map export. The pixels with nodes edited in the particular frame become red. The red decays over 000 frames towards either blue or green. Green pixels have expoentially more nodes than blue ones.  Two Minute Tutorials: Adding a building to OpenStreetMap  A brief introduction on adding buildings to OpenStreetMap, the free and editable map of the world. Buildings are one of the most useful things you can add to Op