LIDAR

http://hydroecology.cee.wisc.edu/Stormwater/Historical%20Change/LIDAR%20Data.html

A LIDAR, "laser radar," Light, Imaging, Detection and Ranging system is a map that uses a light from a laser radar in order to project a 3D image of a geographical surface or area. The above image is an example of this 3D image that a LIDAR is capable of producing.