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Colorado geoid comp...
Colorado geoid computation experiment : overview and summary
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- Wang, Yan Ming (författare)
- National Geodetic Survey, USA,Natl Geodet Survey, 1315 East West Highway, Silver Spring, MD 20910 USA.
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- Sanchez, Laura (författare)
- Technical University of Munich, Germany
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- Ågren, Jonas, 1967- (författare)
- KTH,Högskolan i Gävle,Samhällsbyggnad,Univ Gävle, Dept Comp & Geospatial Sci, S-80176 Gävle, Sweden.;Swedish Mapping Cadastral & Land Registrat Author, Lantmäteriet, S-80182 Gävle, Sweden.;KTH Royal Inst Technol, S-10044 Stockholm, Sweden.,Geodesi och satellitpositionering
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- Huang, Jianliang (författare)
- Canadian Geodetic Survey
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- Forsberg, René (författare)
- Technical University of Denmark
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- Abd-Elmotaal, Hussein A (författare)
- Minia University, Egypt
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- Ahlgren, Kevin (författare)
- National Geodetic Survey, USA
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- Barzaghi, Riccardo (författare)
- Politecnico Di Milano, Italy
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- Basic, Tomislav (författare)
- University of Zagreb, Croatia
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- Carrion, Daniela (författare)
- Politecnico Di Milano, Italy
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- Claessens, Sten (författare)
- Curtin University, Australia
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- Erol, Bihter (författare)
- Istanbul Technical University, Turkey
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- Erol, Serdar (författare)
- Istanbul Technical University, Turkey
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- Filmer, Mick (författare)
- Curtin University, Australia
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- Grigoriadis, Vassilios N. (författare)
- Aristotle University of Thessaloniki, Greece
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- Isik, Mustafa Serkan (författare)
- Istanbul Technical University, Turkey
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- Jiang, Tao (författare)
- Chinese Academy of Surveying and Mapping
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- Koc, Öykü (författare)
- Istanbul Technical University, Turkey
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- Krcmaric, Jordan (författare)
- National Geodetic Survey, USA
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- Li, Xiaopeng (författare)
- National Geodetic Survey, USA
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- Liu, Qing (författare)
- University of Munich, Germany
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- Matsuo, Koji (författare)
- Geospatial Information Authority of Japan
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- Natsiopoulos, Dimitris A (författare)
- Aristotle University of Thessaloniki, Greece
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- Novak, Pavel (författare)
- University of West Bohemia, Czech Republic
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- Pail, Roland (författare)
- University of Munich, Germany
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- Pitonak, Martin (författare)
- University of West Bohemia, Czech Republic
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- Schmidt, Michael (författare)
- University of Munich, Germany
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- Varga, Matej (författare)
- Institute of Geodesy and Photogrammetry, GSEG, ETH Zürich, Switzerland
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- Vergos, Georgios S (författare)
- Aristotle University of Thessaloniki, Greece
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- Veronneau, Marc (författare)
- Canadian Geodetic Survey
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- Willberg, Martin (författare)
- University of Munich, Germany
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- Zingerle, Philipp (författare)
- University of Munich, Germany,Tech Univ Munich, Inst Astron & Phys Geodesy, Arcisstr 21, D-80333 Munich, Germany.
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National Geodetic Survey, USA Natl Geodet Survey, 1315 East West Highway, Silver Spring, MD 20910 USA (creator_code:org_t)
- 2021-11-03
- 2021
- Engelska.
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Ingår i: Journal of Geodesy. - : Springer. - 0949-7714 .- 1432-1394. ; 95:12
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- The primary objective of the 1-cm geoid experiment in Colorado (USA) is to compare the numerous geoid computation methods used by different groups around the world. This is intended to lay the foundations for tuning computation methods to achieve the sought after 1-cm accuracy, and also evaluate how this accuracy may be robustly assessed. In this experiment, (quasi)geoid models were computed using the same input data provided by the US National Geodetic Survey (NGS), but using different methodologies. The rugged mountainous study area (730 km x 560 km) in Colorado was chosen so as to accentuate any differences between the methodologies, and to take advantage of newly collected GPS/leveling data of the Geoid Slope Validation Survey 2017 (GSVS17) which are now available to be used as an accurate and independent test dataset. Fourteen groups from fourteen countries submitted a gravimetric geoid and a quasigeoid model in a 1' x 1' grid for the study area, as well as geoid heights, height anomalies, and geopotential values at the 223 GSVS17 marks. This paper concentrates on the quasigeoid model comparison and evaluation, while the geopotential value investigations are presented as a separate paper (Sanchez et al. in J Geodesy 95(3):1. https://doi.org/10.1007/s00190-021-01481-0, 2021). Three comparisons are performed: the area comparison to show the model precision, the comparison with the GSVS17 data to estimate the relative accuracy of the models, and the differential quasigeoid (slope) comparison with GSVS17 to assess the relative accuracy of the height anomalies at different baseline lengths. The results show that the precision of the 1' x 1' models over the complete area is about 2 cm, while the accuracy estimates along the GSVS17 profile range from 1.2 cm to 3.4 cm. Considering that the GSVS17 does not pass the roughest terrain, we estimate that the quasigeoid can be computed with an accuracy of similar to 2 cm in Colorado. The slope comparisons show that RMS values of the differences vary from 2 to 8 cm in all baseline lengths. Although the 2-cm precision and 2-cm relative accuracy have been estimated in such a rugged region, the experiment has not reached the 1-cm accuracy goal. At this point, the different accuracy estimates are not a proof of the superiority of one methodology over another because the model precision and accuracy of the GSVS17-derived height anomalies are at a similar level. It appears that the differences are not primarily caused by differences in theory, but that they originate mostly from numerical computations and/or data processing techniques. Consequently, recommendations to improve the model precision toward the 1-cm accuracy are also given in this paper.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Nyckelord
- Colorado experiment
- 1-cm geoid experiment
- Geoid computation
- Quasigeoid computation
- Geoid-quasigeoid separation term
- GRAV-D
- GSVS17
- GPS/leveling
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Wang, Yan Ming
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Sanchez, Laura
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Ågren, Jonas, 19 ...
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Huang, Jianliang
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Forsberg, René
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Abd-Elmotaal, Hu ...
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visa fler...
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Ahlgren, Kevin
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Barzaghi, Riccar ...
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Basic, Tomislav
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Carrion, Daniela
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Claessens, Sten
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Erol, Bihter
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Erol, Serdar
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Filmer, Mick
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Grigoriadis, Vas ...
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Isik, Mustafa Se ...
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Jiang, Tao
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Koc, Öykü
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Krcmaric, Jordan
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Li, Xiaopeng
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Liu, Qing
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Matsuo, Koji
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Natsiopoulos, Di ...
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Novak, Pavel
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Pail, Roland
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Pitonak, Martin
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Schmidt, Michael
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Varga, Matej
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Vergos, Georgios ...
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Veronneau, Marc
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Willberg, Martin
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Zingerle, Philip ...
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