Geoid Heights in Costa Rica, Case of Study: Baseline Along the Central Pacific Zone
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Universidad de Costa Rica
2020
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| _version_ | 1876433006570242048 |
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| author | Alonso Vega Fernández |
| author_facet | Alonso Vega Fernández |
| contents | Geoid Heights in Costa Rica, Case of Study: Baseline Along the Central Pacific Zone Alonso Vega Fernández Oscar H. Lücke Castro Jaime Garbanzo León Ingeniería Geoid Geodesy Hight Systems Ortometric Hight Geodetic Levelling A precise orthometric height (H) and orthometric height difference (ΔH) determination is required in many Àelds like Construction, Geodesy and Geophysics. H is often obtained from an ellipsoidal height (h) and geoid height (N) of a geopotential model (GM) because this computation does not have the spirit leveling restrictions on long distances. However, the H accuracy depends on the GM local area adaptation, and current global geopotential models (GGMs) have not been yet evaluated for Costa Rica. Therefore, this paper aims to determine which GGM maintains a better Àt with a GPS/levelling baseline that contains the gravity full spectrum. A 74 km baseline was measured using GPS, spirit leveling and gravity measurements to validate the N computed from EGM2008, EIGEN-6C4, GECO, EGM96, GGM05C and GOCO05C. First, an absolute N assessment was made, where geoid height from the GGMs (NGGM) were directly compared to the geometric geoid heights (Ngeo) obtained from GPS and spirit levelling. A bias Àt (Nbias) was computed from this comparison to the GGMs with respect to the local vertical reference surface (W0). This Nbias value differs from model to model but the best Àt is given by GECO. By subtracting the Nbias, a relative geoid height (ΔN) assessment was designed to compare the differences between GGM relative geoid height (ΔNGGM) and geometric relative geoid height (ΔNgeo) on segments along the baseline. The ΔN comparison shows that EGM2008, EIGEN-6C4 and GECO better represent the Costa Rican Central PaciÀc Coastal Zone and over long distances, ΔH can be computed with a decimeter to centimeter precision. 2020 artículo científico 1409-2441 https://www.redalyc.org/articulo.oa?id=44170544005 en http://www.redalyc.org/revista.oa?id=441 Ingeniería. Revista de la Universidad de Costa Rica application/pdf Universidad de Costa Rica Ingeniería. Revista de la Universidad de Costa Rica (Costa Rica) Num.1 Vol.30 |
| format | Artículo científico |
| id | redalyc_44170544005 |
| institution | Redalyc |
| language | en |
| publishDate | 2020 |
| publisher | Universidad de Costa Rica |
| spellingShingle | Geoid Heights in Costa Rica, Case of Study: Baseline Along the Central Pacific Zone Alonso Vega Fernández Ingeniería Geoid Geodesy Hight Systems Ortometric Hight Geodetic Levelling Geoid Heights in Costa Rica, Case of Study: Baseline Along the Central Pacific Zone Alonso Vega Fernández Oscar H. Lücke Castro Jaime Garbanzo León Ingeniería Geoid Geodesy Hight Systems Ortometric Hight Geodetic Levelling A precise orthometric height (H) and orthometric height difference (ΔH) determination is required in many Àelds like Construction, Geodesy and Geophysics. H is often obtained from an ellipsoidal height (h) and geoid height (N) of a geopotential model (GM) because this computation does not have the spirit leveling restrictions on long distances. However, the H accuracy depends on the GM local area adaptation, and current global geopotential models (GGMs) have not been yet evaluated for Costa Rica. Therefore, this paper aims to determine which GGM maintains a better Àt with a GPS/levelling baseline that contains the gravity full spectrum. A 74 km baseline was measured using GPS, spirit leveling and gravity measurements to validate the N computed from EGM2008, EIGEN-6C4, GECO, EGM96, GGM05C and GOCO05C. First, an absolute N assessment was made, where geoid height from the GGMs (NGGM) were directly compared to the geometric geoid heights (Ngeo) obtained from GPS and spirit levelling. A bias Àt (Nbias) was computed from this comparison to the GGMs with respect to the local vertical reference surface (W0). This Nbias value differs from model to model but the best Àt is given by GECO. By subtracting the Nbias, a relative geoid height (ΔN) assessment was designed to compare the differences between GGM relative geoid height (ΔNGGM) and geometric relative geoid height (ΔNgeo) on segments along the baseline. The ΔN comparison shows that EGM2008, EIGEN-6C4 and GECO better represent the Costa Rican Central PaciÀc Coastal Zone and over long distances, ΔH can be computed with a decimeter to centimeter precision. 2020 artículo científico 1409-2441 https://www.redalyc.org/articulo.oa?id=44170544005 en http://www.redalyc.org/revista.oa?id=441 Ingeniería. Revista de la Universidad de Costa Rica application/pdf Universidad de Costa Rica Ingeniería. Revista de la Universidad de Costa Rica (Costa Rica) Num.1 Vol.30 |
| title | Geoid Heights in Costa Rica, Case of Study: Baseline Along the Central Pacific Zone |
| topic | Ingeniería Geoid Geodesy Hight Systems Ortometric Hight Geodetic Levelling |
| url | https://www.redalyc.org/articulo.oa?id=44170544005 |