Abstract
At GFZ/D-PAF ERS-1 altimeter data are used to generate systematically geophysical products. From fast delivery data, D-PAF preliminary orbit and actual meteorological data, quick-look ocean products (QLOPR) and quick-look sea surface height models (SSHQL) are generated with a delay of 2 weeks. Precise altimeter data (OPR02) from F-PAF are used to generate short period and stationary sea surface height models, sea surface topography and ocean geoid models.
The presentation is focused on the generation of the ocean geoid model, which is routinely updated every 6 months. Based on the stationary sea surface height model, an oceanographic model of the permanent sea surface topography and an a-priori satellite-only gravity field model, an iterative least squares spectral combination is performed to generate a gravity field model complete to degree and order 360. Solving this model to half degree geoid heights on a global grid, the final product is generated and provided to user community on request via the ERS user desk in Frascati.
Solutions for the stationary (mean) sea surface as well as for the geoid are presented. Quality estimates for these models are provided in terms of internal error estimates and external comparisons to other models. A first regional sea surface based on QLOPR for nearly the complete first 168 day repeat cycle of ERS-1 was also computed. For this ERS-1 mission phase, altimeter data with a spatial resolution of 16 km at the equator are available. After completion of cycle, a global 3’x3’ sea surface height model based on QLOPR, and when available based on OPR02 data will be computed.
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Gruber, T., Anzenhofer, M., Rentsch, M. (1995). D-PAF Mean Sea Surfaces and High Resolution Gravity Field Models Based on ERS-1 Altimeter Data. In: Sünkel, H., Marson, I. (eds) Gravity and Geoid. International Association of Geodesy Symposia, vol 113. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-79721-7_35
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DOI: https://doi.org/10.1007/978-3-642-79721-7_35
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