Evaluation of recent combined global geopotential models in Brazil
| Autor: | S. R. C. de Freitas, E. Nicacio, Regiane Dalazoana |
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| Rok vydání: | 2018 |
| Předmět: |
QB275-343
Geopotential 010504 meteorology & atmospheric sciences Applied Mathematics geopotential functionals normal-geoid height modeling Astronomy and Astrophysics 010502 geochemistry & geophysics 01 natural sciences combined global geopotential models Geophysics brazil Climatology Earth and Planetary Sciences (miscellaneous) Computers in Earth Sciences Geodesy Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Geodetic Science, Vol 8, Iss 1, Pp 72-82 (2018) |
| ISSN: | 2081-9943 |
| DOI: | 10.1515/jogs-2018-0008 |
| Popis: | The aim of this paper is to present a quantitative analysis of the adequacy of the main currently existing combined Global Geopotential Models (GGMs) for modeling normal-geoid heights throughout Brazil. As major advances have been reached since mid-2016 in the combined GGMs elaboration and development, the main objective of this analysis is to verify if, in fact, the most recent models present superior or equivalent performance to the most performant previous models. The analysis was based on comparisons between normal-geoid height values obtained fromGNSS/leveling solutions and values calculated from GGMs XGM2016, GOCO05C, EIGEN-6C4 and EGM2008, according to different geopotential functionals - geoid height and height anomaly - and in different degrees of development, always through the relative method. This procedure was applied to 997 stations which carry information of both ellipsoidal and normal-orthometric heights, located all over Brazil. As a main result, it was observed the superior performance of the recent combined GGMs, GOCO05C and XGM2016, when compared to the older models, EIGEN-6C4 and EGM2008, when all of them are developed up to degree 720, the maximum degree of the recent models; and a approximate equality of results when all of the models are used in their individual maximum degrees. |
| Databáze: | OpenAIRE |
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