Gravimetric geoid refinement using high resolution gravity and terrain data
In regions where additional, spatially dense gravity and terrain information are available to augment existing data, a gravimetric determination of the geoid can be improved by incorporating these new data. In this study, 4,016 additional gravity observations, measured on a near-regular 2km by 3km...
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| Format: | Journal Article |
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Institution of Surveyors, Australia
1996
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| Online Access: | http://hdl.handle.net/20.500.11937/17359 |
| _version_ | 1848749445655560192 |
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| author | Featherstone, Will Alexander, K. Sideris, M. |
| author_facet | Featherstone, Will Alexander, K. Sideris, M. |
| author_sort | Featherstone, Will |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | In regions where additional, spatially dense gravity and terrain information are available to augment existing data, a gravimetric determination of the geoid can be improved by incorporating these new data. In this study, 4,016 additional gravity observations, measured on a near-regular 2km by 3km grid in Western Australia have been used to compute a gravimetric geoid model using fast Fourier transform (FFT) techniques. A digital terrain model is also used during the geoid computations, which is derived from gravity station elevations and spot heights in the area. Using 21 spirit-levelled Australian Height Datum (AHD) heights in conjunction with Global Positioning System (GPS) ellipsoidal heights as control data, the standard deviation of the new gravimetric geoid is ±0.0824m. This represents a 31% improvement over the existing AUSGEOID93 gravimetric geoid and a 48% improvement over the OSU91A global geopotential model. Of these improvements, approximately 10% is due to the additional gravity data and approximately 1% is due to the terrain effects; the remainder is due to the dense gridding of the data prior to the FFT computations. |
| first_indexed | 2025-11-14T07:21:03Z |
| format | Journal Article |
| id | curtin-20.500.11937-17359 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:21:03Z |
| publishDate | 1996 |
| publisher | Institution of Surveyors, Australia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-173592017-05-30T08:14:25Z Gravimetric geoid refinement using high resolution gravity and terrain data Featherstone, Will Alexander, K. Sideris, M. Australia Geoid In regions where additional, spatially dense gravity and terrain information are available to augment existing data, a gravimetric determination of the geoid can be improved by incorporating these new data. In this study, 4,016 additional gravity observations, measured on a near-regular 2km by 3km grid in Western Australia have been used to compute a gravimetric geoid model using fast Fourier transform (FFT) techniques. A digital terrain model is also used during the geoid computations, which is derived from gravity station elevations and spot heights in the area. Using 21 spirit-levelled Australian Height Datum (AHD) heights in conjunction with Global Positioning System (GPS) ellipsoidal heights as control data, the standard deviation of the new gravimetric geoid is ±0.0824m. This represents a 31% improvement over the existing AUSGEOID93 gravimetric geoid and a 48% improvement over the OSU91A global geopotential model. Of these improvements, approximately 10% is due to the additional gravity data and approximately 1% is due to the terrain effects; the remainder is due to the dense gridding of the data prior to the FFT computations. 1996 Journal Article http://hdl.handle.net/20.500.11937/17359 Institution of Surveyors, Australia fulltext |
| spellingShingle | Australia Geoid Featherstone, Will Alexander, K. Sideris, M. Gravimetric geoid refinement using high resolution gravity and terrain data |
| title | Gravimetric geoid refinement using high resolution gravity and terrain data |
| title_full | Gravimetric geoid refinement using high resolution gravity and terrain data |
| title_fullStr | Gravimetric geoid refinement using high resolution gravity and terrain data |
| title_full_unstemmed | Gravimetric geoid refinement using high resolution gravity and terrain data |
| title_short | Gravimetric geoid refinement using high resolution gravity and terrain data |
| title_sort | gravimetric geoid refinement using high resolution gravity and terrain data |
| topic | Australia Geoid |
| url | http://hdl.handle.net/20.500.11937/17359 |