Project manager Stephen Merkowitz talks about his work with NASA's Space Geodesy Project, including a brief overview of the four fundamental techniques of space geodesy: GPS, VLBI, SLR, and DORIS.
Learn more about space geodesy at: http://space-geodesy.nasa.gov/
This video is public domain and can be downloaded at: http://svs.gsfc.nasa.gov/goto?11031
Geodesy is the science of the Earth’s shape, gravity and rotation, including their evolution in time. A number of different techniques are used to observe the geodetic properties of the Earth including the space-geodetic techniques of Very Long Baseline Interferometry (VLBI), Satellite Laser Ranging (SLR), Global Navigation Satellite Systems (GNSS) like the US Global Positioning System (GPS), and the French Doppler Orbitography and Radio-Positioning by Integrated Satellite (DORIS) system. These space-geodetic observations also provide the basis for the reference frame that is needed in order to assign coordinates to points and objects and thereby determine how those points and objects move over time. See: SGP Science
Space Geodesy provides positioning, navigation, and timing reference systems and Earth system observations