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THE DETERMINATION AND USE OF ORTHOMETRIC HEIGHTS DERIVED FROM THE SEASAT RADAR ALTIMETER OVER LAND

CHUA, PK; KEARSLEY, AHW; RIDLEY, JK; CUDLIP, W; RAPLEY, CG; (1991) THE DETERMINATION AND USE OF ORTHOMETRIC HEIGHTS DERIVED FROM THE SEASAT RADAR ALTIMETER OVER LAND. PHOTOGRAMM ENG REM S , 57 (4) 437 - 445.

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Abstract

Orthometric height data derived from the Seasat radar altimeter are compared with ground control data based on terrestrial survey measurements in the Simpson Desert, Australia. A bicubic spline surface is used to model the ground control heights, and the RMS of the differences between the model surface and the raw measurements in an area containing the most trustworthy height control data is found to be about +/- 0.4 m. We show that the altimetry recovers the mean terrain height with an accuracy slightly better than 1 m, and with a precision of +/- 0.4 to +/- 0.7 m per radar pulse. This implies a precision of about +/- 0.05 to +/- 0.08 m for the mean of an approximately 50 km profile. Given this capability, we suggest various applications of satellite radar altimetry over land, including the use of height data to validate and/or extend digital elevation models, to improve local geoid models, and to improve the satellite orbit ephemeris.

Type:Article
Title:THE DETERMINATION AND USE OF ORTHOMETRIC HEIGHTS DERIVED FROM THE SEASAT RADAR ALTIMETER OVER LAND
Keywords:MODEL
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Earth Sciences

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