GPS Geodetic Reference System WGS 84

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Earth Gravitational Model 2008 Earth Gravitational Model 2008 (EGM08) Approved for Public Release 09-478 12
Earth Gravitational Model 2008 EGM96 30 min x 30 min resolution 50 cm RMS accuracy 70 x 70 error propagation 40 satellites used for long wavelengths 30 million surface gravity values 29 elevation codes 130K coefficients EGM2008 5 min x 5 min resolution 15 cm RMS accuracy 2160 x 2160 error prop CHAMP and GRACE used for long wavelengths 54 million surface gravity values SRTM, ICESAT for elevation 4.7 M coefficients Applications • More accurate geopotential surface to reference land elevations • Improved reference frame for defining position coordinates • Improved Satellite Orbits •Enhanced gravity models • Increased knowledge of ocean circulation Approved for Public Release 09-478 13
Page 1 and 2: GPS Geodetic Reference System WGS 8
Page 3 and 4: WGS 84 Support for Positioning and
Page 5 and 6: WGS 84 Maintenance • Ensure scien
Page 7 and 8: WGS 84 Aligned to ITRF ILRS SLR Obs
Page 9 and 10: WGS 84 used World-wide • Practica
Page 11: BACKUP SLIDES Approved for Public R

GPS Geodetic Reference System WGS 84

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