Evaluation of International Terrestrial Reference Frame Colocated Ties through Compatibility Testing
Publication: Journal of Surveying Engineering
Volume 135, Issue 1
Abstract
Evaluation on the agreement between colocated ties and ties estimated from space geodesy techniques before the intertechnique combination is essential to an accurate combination solution realization. Previous studies evaluate their agreement based on the magnitude of postfit residuals with normalized residuals during the intertechnique combination and magnitude of their differences through intratechnique combination from space geodetic measurement. This study formulates an alternative criterion based on the critical value of the chi-square test statistic through compatibility testing for the evaluation of both ties agreement. Individual terrestrial reference frame solution and corresponding colocated ties data within 14 colocated sites used in ITRF2000 realization were selected for the study. It was found that the devised criterion flagged and retained the same set of colocated ties in common with previous contribution results, which makes itself another alternative for further validation. Given the demand of the fusion of several groups of data for better derived information in geosciences and remote sensing, this criterion could also be applied to outlier detection for each group of data during the fusion process.
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Acknowledgments
This study was supported using funds from the competitive earmarked research grant (CERG) allocation project No. UNSPECIFIEDG-T423. The writer would like to thank Dr. Altamimi [Institut Géographique National (IGN), France] for providing all raw data for this research. Thanks also go to Prof. H. Bâki Iz (Hong Kong Polytechnic University) for his guidance on the writer’s thesis.
References
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Information & Authors
Information
Published In
Journal of Surveying Engineering
Volume 135 • Issue 1 • February 2009
Pages: 27 - 32
Copyright
© 2009 ASCE.
History
Received: Sep 27, 2007
Accepted: Aug 11, 2008
Published online: Feb 1, 2009
Published in print: Feb 2009
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