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  • 1
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    Ocean gravity and geoid determination (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Gravity anomalies have been recovered in the North Atlantic and the Indian Ocean regions. Comparisons of 63 2 deg x 2 deg mean free air gravity anomalies recovered in the North Atlantic area and 24 5 deg x 5 deg mean free air gravity anomalies in the Indian Ocean area with surface gravimetric measurements have shown agreement to + or - 8 mGal for both solutions. Geoids derived from the altimeter solutions are consistent with altimetric sea surface height data to within the precision of the data, about + or - 2 m.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research; 84; July 30
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mean sea level determination from satellite altimetry (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The primary experiment on the Geodynamics Experimental Ocean Satellite-3 (GEOS-3) is the radar altimeter. This experiment's major objective is to demonstrate the utility of measuring the geometry of the ocean surface; i.e., the geoid. Results obtained from this experiment so far indicate that the planned objectives of measuring the topography of the ocean surface with an absolute accuracy of + or - 5 m can be met and perhaps exceeded. The GEOS-3 satellite altimeter measurements have an instrument precision in the range of + or - 25 cm to + or - 50 cm when the altimeter is operating in the 'short pulse' mode. After one year's operations of the altimeter, data from over 5000 altimeter passes have been collected. With the mathematical models developed and the altimeter data presently available, mapping of local areas of ocean topography has been realized to the planned accuracy levels and better. This paper presents the basic data processing methods employed and some interesting results achieved with the early data. Plots of mean sea surface heights as inferred by the altimeter measurements are compared with a detailed 1 by 1 deg gravimetric geoid.
    Keywords: OCEANOGRAPHY
    Type: Marine Geodesy; 2; 2, 19; 1979
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Surface observations for the evaluation of geophysical measurements from Seasat (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The surface observations used for direct comparison with Seasat-derived values at fixed locations and as input to analyzed fields of pressure, wind, air and sea temperatures, and surface dew point are discussed. These included measurements made by research vessels participating in the Gulf of Alaska Seasat Experiment (GOASEX) and NOAA research platforms in addition to aircraft observations and reports from the World Weather Watch. The application of these observations in describing the synoptic-scale winds over the ocean is discussed, and the sensitivity of the verification statistics to the type of data (observations from buoys, weather ships, and transient vessels with or without anemometers) is considered. Results of a preliminary comparison of wind fields derived from Seasat-A scatterometer observation with winds specified by several types of platforms are presented.
    Keywords: OCEANOGRAPHY
    Type: Science; 204; June 29
    Format: text
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    NASA TECHNICAL REPORTS
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