Geodetic Journey

International Laser Ranging Service

Satellite laser ranging uses lasers to measure ranges from ground stations to satellite borne retro-reflectores to the millimeter level. The primary mission of the ILRS is to support, through satellite lunar laser tracking data and related products, geodetic and geophysical research activities.  

Satellite laser ranging uses lasers to measure ranges from ground stations to satellite borne retro-reflectors to the millimeter level. The primary mission of the ILRS as stated in the organization's Terms of Reference is "to support, through satellite and lunar laser tracking data and related products, geodetic and geophysical research activities."

http://ilrs.gsfc.nasa.gov/