Colorado geoid computation experiment: overview and summary

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F21%3A43962380" target="_blank" >RIV/49777513:23520/21:43962380 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s00190-021-01567-9" target="_blank" >https://link.springer.com/article/10.1007/s00190-021-01567-9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00190-021-01567-9" target="_blank" >10.1007/s00190-021-01567-9</a>

Result language

angličtina

Original language name

Colorado geoid computation experiment: overview and summary

Original language description

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 × 550 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 is now available to be used as an accurate and independent test dataset. Fourteen groups from thirteen countries submitted a gravimetric geoid and a quasigeoid model in a 1 arc-min 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 (Sánchez et al. 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 arc-min 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10508 - Physical geography

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

JOURNAL OF GEODESY

ISSN

0949-7714

e-ISSN

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Volume of the periodical

95

Issue of the periodical within the volume

127

Country of publishing house

DE - GERMANY

Number of pages

21

Pages from-to

1-21

UT code for WoS article

000714366200001

EID of the result in the Scopus database

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