Comparisons between Geosat and Seasat tracking over non-ocean surfaces

Physics

Scientific paper

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Earth Surface, Geosat Satellites, Relief Maps, Satellite Altimetry, Seasat Satellites, Tracking (Position), Antenna Design, Remote Sensing, Satellite Observation, Topography

Scientific paper

The differences in both the quantity and quality of the nonocean measurements of the Geosat and Seasat altimeters due to the tracker modifications and satellite and antenna design changes are presented. The Geosat tracker exhibits more agility over the rougher surfaces and therefore is able to maintain lock better than Seasat. Large off-nadir attitude excursions created differences in Geosat tracking between cycles. The Geosat altimeter was at times able to track over surfaces Seasat could not, but sometimes the acquisition problem was worse. It is observed that Geosat yields denser coverage, but over land Seasat measurements yield a better overall picture of the general topography. It is concluded that the Geosat elevation data set over land can best be utilized to augment the information obtained from the Seasat data and is most useful when investigating topography at scales less than 100 km.

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