LIDAR

 

http://www.loc.gov/exhibits/911/911-maps.html

This is LIDAR three-dimensional model of Ground Zero after September 11, 2001. LIDAR provided elevation data of the Ground Zero site which allowed emergency managers to assess damage through smoke. The data was used to determine changes in the rubble pile and to create 3-D digital elevation models that demonstrated the extent of the destruction. Light detection and ranging (LIDAR), is an optical remote sensing technology that can measure the distance to a target by illuminating the target with light, often using pulses from a laser.