Colorado geoid computation experiment: overview and summary
نویسندگان
چکیده
The primary objective of the 1-cm geoid experiment in Colorado (USA) is to compare numerous computation methods used by different groups around world. This intended lay foundations for tuning achieve sought after accuracy, and also evaluate how this accuracy may be robustly assessed. In experiment, (quasi)geoid models were computed using same input data provided US National Geodetic Survey (NGS), but methodologies. rugged mountainous study area (730 km $$\times $$ 560 km) was chosen so as accentuate any differences between methodologies, take advantage newly collected GPS/leveling Geoid Slope Validation 2017 (GSVS17) which are now available an accurate independent test dataset. Fourteen from fourteen countries submitted a gravimetric quasigeoid model 1? grid area, well heights, height anomalies, geopotential values at 223 GSVS17 marks. paper concentrates on comparison evaluation, while value investigations presented separate (Sánchez et al. J Geodesy 95(3):1. https://doi.org/10.1007/s00190-021-01481-0 , 2021). Three comparisons performed: show precision, with estimate relative models, differential (slope) assess anomalies baseline lengths. results that precision × over complete about 2 cm, estimates along profile range 1.2 cm 3.4 cm. Considering does not pass roughest terrain, we can ~ Colorado. slope RMS vary 8 all Although 2-cm have been estimated such region, has reached goal. At point, proof superiority one methodology another because GSVS17-derived similar level. It appears primarily caused theory, they originate mostly numerical computations and/or processing techniques. Consequently, recommendations improve toward given paper.
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ژورنال
عنوان ژورنال: Journal of geodesy
سال: 2021
ISSN: ['1432-1394', '0949-7714']
DOI: https://doi.org/10.1007/s00190-021-01567-9