LIDAR Map

http://www.google.com/imgres?hl=en&biw=1680&bih=947&tbm=isch&tbnid=piJMuN9X0xzn0M:&imgrefurl=http://www.noaanews.noaa.gov/stories/s798.htm&docid=0etJ7XKrMBzbsM&imgurl=http://www.noaanews.noaa.gov/stories/images/manhattan-lidar092701.jpg&w=3764&h=2056&ei=m03yT5j2GYay8AS8hJyAAg&zoom=1&iact=hc&vpx=817&vpy=477&dur=3320&hovh=166&hovw=304&tx=112&ty=95&sig=113213532916660177585&page=1&tbnh=112&tbnw=205&start=0&ndsp=40&ved=1t:429,r:20,s:0,i:137

This is a LIDAR map of lower Manhattan from September of 2001 after 9/11.  It uses light (laser pulses), instead of radio or microwave radiation that is used with radar, to map an area.