LIDAR (light detecting and ranging) is a method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of pulsed laser light reflected from their surfaces.
In this example, the U.S. Geological Survey (USGS) and NASA scientists studied Mount St. Helens using LIDAR technology to analyze changes in the surface elevation of this crator which began deforming in late September 2004. Elevation differences in the crater were found between two airborne LIDAR surveys conducted in September 2003 and October 4, 2004. The image is a computer-generated representation of the October 4 topography. In this image colors indicate areas of change.
http://www.nasa.gov/centers/goddard/earthandsun/mshelenslidar.html
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