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Coordinate Accuracy Comparison of Online GPS Data Processing Services  

Won, Ji-Hye (인하대학교 공과대학 지리정보공학과)
Son, Eun-Seong (인하대학교 공과대학 지리정보공학과)
Park, Kwan-Dong (인하대학교 공과대학 지리정보공학과)
Publication Information
Journal of Korean Society for Geospatial Information Science / v.18, no.4, 2010 , pp. 31-39 More about this Journal
Abstract
In this study, the performance of the online GPS processing services provided by diverse institutions was compared so that domestic GPS users in geodesy and surveying can easily get precise coordinates using those services. In order to evaluate the accuracy of each online GPS processing service, we calculated coordinates of seven GPS permanent stations located in Korea and foreign countries using APPS, CSRS-PPP, AUSPOS and OPUS. And the results were compared with published coordinates by IERS and National Geographic Information Institute. In the cases of foreign stations, the mean value of the horizontal errors was 9.3 mm and the descending order of accuracies was APPS, AUSPOS, OPUS and CSRS-PPP. In the cases of Korean stations, the mean value of the horizontal errors was 37.6 mm, although the order of accuracy was similar to the foreign cases; AUSPOS, APPS, OPUS and CSRS-PPP. Also, the average value of 3-D errors in Korean cases was about 3 cm larger than that of foreign cases and a bias of 3 cm was observed in the north direction.
Keywords
Online GPS Data Processing; AUSPOS; APPS; CSRS-PPP; OPUS;
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Times Cited By KSCI : 2  (Citation Analysis)
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8 AUSPOS 홈페이지 http://www.ga.gov.au/bin/gps.pl
9 APPS 홈페이지 http://apps.gdgps.net
10 ITRF 홈페이지 http://itrf.ensg.ign.fr
11 OPUS 홈페이지 http://www.ngs.noaa.gov/OPUS
12 NRCan 홈페이지 http://www.geod.nrcan.gc.ca