Abstract
The recovery of quantities related to the gravity field (e.g., geoid heights, gravity anomalies, deflections of the vertical) is realized in the off Newfoundland sea area on the East coast of Canada using reliable marine gravity data and altimeter data from ERS-1 Geodetic Mission (GM). The methods tested include three basic methods, i.e., the Input-Output System Theory (IOST) and the Least Squares Adjustment in the Frequency Domain (LSAFD) methods used to compute geoid heights and gravity anomalies and the Inverse Stokes (IS) method used to compute deflections of the vertical. Evaluations are done in the spectral domain utilizing planar and spherical Fast Fourier Transform (FFT) algorithms. The input to these methods consists of (almost) directly observable data such as altimetric sea surface heights (geoid heights) and shipborne gravity anomalies, and derived data such as marine geoid heights, gravity anomalies and deflections of the vertical. The estimated results are intercompared in order to assess the agreement of the predicted quantities derived by different methods and with different input data and data errors. The geoid heights are additionally compared to TOPEX altimeter data.
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