Abstract

Abstract Several interpolation techniques based on a set of points with known elevations and ellipsoidal heights have been investigated to estimate elevation above the mean sea level by Global Positioning System (GPS). The weighted average method is described in Sunkel, 1980. The method used a moving surface approach, and uses the known points within a user specified distance from the interpolation point. One of the method uses geoid heights obtained from Quasi97b model developed by the Dept of Planetary Geodesy, Space Research Centre in Warsaw. A computer programme called HGPS that can estimate these elevations by the pointed-out methods was developed. The interpolation techniques were tested within the limiting distances such as 50 and 100 km. Tests showed that these methods may provide useful elevations from GPS in areas where there is a shortage of gravity data for a detail gravimetric geoid estimation.

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