RTM gravity forward-modeling using topography/bathymetry data to improve high-degree global geopotential models in the coastal zone
We apply the residual terrain modeling (RTM) technique for gravity forward-modeling to successfully improve high-resolution global gravity fields at short spatial scales in coastal zones. The RTM scheme is combined with the concept of rock-equivalent topography, allowing to use a single uniform cons...
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| Format: | Journal Article |
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Taylor and Francis
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/45384 |
| _version_ | 1848757268294664192 |
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| author | Hirt, Christian |
| author_facet | Hirt, Christian |
| author_sort | Hirt, Christian |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We apply the residual terrain modeling (RTM) technique for gravity forward-modeling to successfully improve high-resolution global gravity fields at short spatial scales in coastal zones. The RTM scheme is combined with the concept of rock-equivalent topography, allowing to use a single uniform constant mass-density in the RTM forward-modeling, both at land and sea. SRTM30_PLUS bathymetry is merged with higher-resolution SRTM V4.1 land topography, and expanded into spherical harmonics to degree 2160, yielding a new and consistent high-degree RTM reference surface. The forward-modeling performance is demonstrated in coastal zones of Greece and Canada using ground-truth vertical deflections, gravity from land and shipborne gravimetry, and geoid heights from GPS/leveling, with improvements originating from bathymetry clearly identified. We demonstrate that the SRTM30_PLUS bathymetry carries information on gravity field structures at spatial scales less than 5 arc minutes, which can be used to augment EGM2008 in (rugged) coastal zones, both over land and marine areas. This may be of value (i) to partially reduce the signal omission error in EGM2008/GOCE-based height transfer in areas devoid of dense gravity data, (ii) to fill the gap between land gravity and shipborne gravity along rugged coastlines and (iii) for the development of next-generation altimetric gravity fields. |
| first_indexed | 2025-11-14T09:25:23Z |
| format | Journal Article |
| id | curtin-20.500.11937-45384 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:25:23Z |
| publishDate | 2013 |
| publisher | Taylor and Francis |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-453842017-09-13T16:05:51Z RTM gravity forward-modeling using topography/bathymetry data to improve high-degree global geopotential models in the coastal zone Hirt, Christian forward-modeling coastal zone topography bathymetry Residual terrain model We apply the residual terrain modeling (RTM) technique for gravity forward-modeling to successfully improve high-resolution global gravity fields at short spatial scales in coastal zones. The RTM scheme is combined with the concept of rock-equivalent topography, allowing to use a single uniform constant mass-density in the RTM forward-modeling, both at land and sea. SRTM30_PLUS bathymetry is merged with higher-resolution SRTM V4.1 land topography, and expanded into spherical harmonics to degree 2160, yielding a new and consistent high-degree RTM reference surface. The forward-modeling performance is demonstrated in coastal zones of Greece and Canada using ground-truth vertical deflections, gravity from land and shipborne gravimetry, and geoid heights from GPS/leveling, with improvements originating from bathymetry clearly identified. We demonstrate that the SRTM30_PLUS bathymetry carries information on gravity field structures at spatial scales less than 5 arc minutes, which can be used to augment EGM2008 in (rugged) coastal zones, both over land and marine areas. This may be of value (i) to partially reduce the signal omission error in EGM2008/GOCE-based height transfer in areas devoid of dense gravity data, (ii) to fill the gap between land gravity and shipborne gravity along rugged coastlines and (iii) for the development of next-generation altimetric gravity fields. 2013 Journal Article http://hdl.handle.net/20.500.11937/45384 10.1080/01490419.2013.779334 Taylor and Francis fulltext |
| spellingShingle | forward-modeling coastal zone topography bathymetry Residual terrain model Hirt, Christian RTM gravity forward-modeling using topography/bathymetry data to improve high-degree global geopotential models in the coastal zone |
| title | RTM gravity forward-modeling using topography/bathymetry data to improve high-degree global geopotential models in the coastal zone |
| title_full | RTM gravity forward-modeling using topography/bathymetry data to improve high-degree global geopotential models in the coastal zone |
| title_fullStr | RTM gravity forward-modeling using topography/bathymetry data to improve high-degree global geopotential models in the coastal zone |
| title_full_unstemmed | RTM gravity forward-modeling using topography/bathymetry data to improve high-degree global geopotential models in the coastal zone |
| title_short | RTM gravity forward-modeling using topography/bathymetry data to improve high-degree global geopotential models in the coastal zone |
| title_sort | rtm gravity forward-modeling using topography/bathymetry data to improve high-degree global geopotential models in the coastal zone |
| topic | forward-modeling coastal zone topography bathymetry Residual terrain model |
| url | http://hdl.handle.net/20.500.11937/45384 |