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Journal of Applied Remote Sensing • Open Access

Uncertainties of the Gravity Recovery and Climate Experiment time-variable gravity-field solutions based on three-cornered hat method
Author(s): Vagner G. Ferreira; Henry D. C. Montecino; Caleb I. Yakubu; Bernhard Heck

Paper Abstract

Currently, various satellite processing centers produce extensive data, with different solutions of the same field being available. For instance, the Gravity Recovery and Climate Experiment (GRACE) has been monitoring terrestrial water storage (TWS) since April 2002, while the Center for Space Research (CSR), the Jet Propulsion Laboratory (JPL), the GeoForschungsZentrum (GFZ), and the Groupe de Recherche de Géodésie Spatiale (GRGS) provide individual monthly solutions in the form of Stokes coefficients. The inverted TWS maps (or the regionally averaged values) from these coefficients are being used in many applications; however, as no ground truth data exist, the uncertainties are unknown. Consequently, the purpose of this work is to assess the quality of each processing center by estimating their uncertainties using a generalized formulation of the three-cornered hat (TCH) method. Overall, the TCH results for the study period of August 2002 to June 2014 indicate that at a global scale, the CSR, GFZ, GRGS, and JPL presented uncertainties of 9.4, 13.7, 14.8, and 13.2 mm, respectively. At a basin scale, the overall good performance of the CSR was observed at 91 river basins. The TCH-based results were confirmed by a comparison with an ensemble solution from the four GRACE processing centers.

Paper Details

Date Published: 25 February 2016
PDF: 20 pages
J. Appl. Rem. Sens. 10(1) 015015 doi: 10.1117/1.JRS.10.015015
Published in: Journal of Applied Remote Sensing Volume 10, Issue 1
Show Author Affiliations
Vagner G. Ferreira, Hohai Univ. (China)
Henry D. C. Montecino, Univ. de Concepción (Chile)
Univ. Federal do Parana (Brazil)
Caleb I. Yakubu, Hohai Univ. (China)
Bernhard Heck, Karlsruher Institut für Technologie (Germany)

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