| Title | Can an Earth Gravitational Model augmented by a Topographic Gravity Field Model realize the International Height Reference System accurately? |
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| Author | Huang, J ;
Véronneau, M; Crowley, J; D'Aoust, B; Pavlic, G |
| Source | International Association of Geodesy Symposia 2022 p. 1-7, https://doi.org/10.1007/1345 2022 162  Open Access |
| Image |  |
| Year | 2022 |
| Alt Series | Natural Resources Canada, Contribution Series 20220101 |
| Publisher | Springer Nature |
| Document | serial |
| Lang. | English |
| Media | paper; digital; on-line |
| File format | pdf |
| Province | Canada; Canada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon;
Nunavut |
| NTS | 1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65;
66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560 |
| Subjects | general geology; Science and Technology; gravity models; topography |
| Illustrations | location maps; tables |
| Program | Canadian Geodetic Survey Geodetic Analysis and Development - Gravity and heights systems |
| Released | 2022 07 28 |
| Abstract | In this study,we evaluate the suitability of recent Earth GravitationalModels (EGMs) for the realization of the International Height Reference System (IHRS) in Canada. Topographic gravity field models
have been used to augment EGMs to spatial resolution reaching 20 (about 4 km), which is comparable to regional geoid models. The advantages of using an EGM over a regional approach for the IHRS are its uniform representation of the Earth's gravity
field and its conformance to international standards and conventions. The main challenge is access to, and best use of knowledge of the regional gravity and topographic data. On the one hand, we determine that two recent hybrid models (EIGEN-6C4 and
XGM2019) augmented by topographic signals give geopotential values (Wp) with accuracy of 0.3 m2 s 2, which is close to those estimated by the Canadian regional geoid models at the 11 International Height Reference Frame sites in Canada. On the other
hand, two recent augmented satellite-only models (DIR-R6 and GOCO06s) give Wp with accuracies between 1.5 and 1.7 m2 s 2 in Canada. |
| Summary | (Plain Language Summary, not published)
Can an Earth Gravitational Model augmented by a Topographic Gravity Field Model realize the International Height Reference System accurately? In this
study, we evaluate the suitability of recent Earth Gravitational Models (EGMs) for the realization of the International Height Reference System (IHRS) in Canada. Hybrid EGMs developed using satellite and terrestrial gravity data have a spatial
resolution of ~10 km. The spatial resolution can be refined to ~4 km by including a global Topographic Gravity Field Model (TGFM), which represents the gravitational attraction generated by topographic and oceanic masses. In comparison to regional
approaches, the use of an EGM has the advantage of realizing an IHRS with a homogeneous representation of the Earth's gravity field and in conformance to international standards and conventions. This study finds that two hybrid EGMs (EIGEN-6C4 and
XGM2019) augmented by topographic signals can realize IHRS with an accuracy of ~ 3 cm while two augmented satellite-only models (DIR-R6 and GOCO06s) show accuracies between 15 and 17 cm in Canada. |
| GEOSCAN ID | 330172 |
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