Overview of JPL's GENESIS GPS Flight Data System
                    Thomas P. Yunck
               Jet Propulsion Laboratory
                               
                       Abstract
                                
GENESIS (the GPS Environmental and Earth Science Information System) is being
developed jointly by JPL and the University of Southern California, under NASA
sponsorship, as a versatile system for distributing GPS flight receiver data 
for a variety of earth science applications. In the near future GENESIS will 
provide GPS data from NASA flight instruments on five international missions, 
including Oersted, Sunsat, Champ, SAC-C, and Jason-1.  Several newer missions, 
including ICESat, Fedsat, and GRACE will follow next year, and others will be 
added as they appear.  In addition to the flight data, GENESIS provides GPS 
tutorial information, online publications, and other user services.  GENESIS 
itself resides partly at JPL and partly at USC.  GENESIS serves both as part 
of NASAÕs Earth Science Information Partners (ESIP) Federation and as a GPS 
flight data center for the IGS.  

Data products eventually to be distributed by GENESIS include

          Atmospheric bending angles
          Retrieved refractivity and number density
          Retrieved pressure and geopotential height
          Retrieved temperature and specific humidity
          Ground line-of-site total electron content
          Ionospheric scintillation index
          Electron density  profiles
          Ground based global zenith TEC maps
          Time & spatial averages of atmospheric products
          Global geopotential height contours & gradients
          Tropopause and boundary layer heights
          Stratospheric wind fields
          2D (vertical) and 3D ionospheric density maps

Version 1.0 of GENESIS is now online at http://genesis.jpl.nasa.gov.  System 
upgrades will be put online at approximately 6 month intervals, with the final 
operational version to be released in late 2001.