The displacement of the SAMP GPS station located in Medan City, Indonesia, is analyzed by means of an on-line point positioning method, the Canadian Spatial Reference System-Precise Point Positioning (CSRS-PPP). Based on the comparison of the results obtained with those from previous studies, we propose that CSRS-PPP can be applied to analyses of the displacement of a GPS station. Previous studies have focused solely on the “Sumatra-Andaman Islands Earthquake of December 26, 2004”; in contrast, we provide here an in-depth analysis of the crustal movements at the SAMP station for an expanded period of 2.5 years. CSRS-PPP, an Internet data processing service of the Department of Natural Resources Canada (NRCan), was used to process the data obtained at the SAMP station from January 2004 to July 2006. The data show a clear displacement in the southwestern direction from December 26, 2004 to March 28, 2005 when two major earthquakes occurred. However, after the midpoint of 2005, the data show displacement at a regular speed. In particular, the “Sumatra-Andaman Islands Earthquake (M w = 9.0) of December 26, 2004” led to a displacement of 0.1387 m (dn = −0.0122 m, de = −0.1382 m) to the southwest. The earthquake (M w = 8.7) that occurred on March 28, 2005 led to a displacement of 0.1921 m (dn = −0.1400 m, de = −0.1315 m) to the southwest. Starting from December 26, 2004, displacement to the southwest continued. From April 2005, however, the speed of the displacement gradually slowed down. The dn variation shows a displacement at a regular rate (−55.69 mm/year) from April 28, 2005 to July 2006, while the de variation shows a displacement at a regular rate (−23.66 mm/year) from July 5, 2005 to July 2006.
The three-dimensional coordinates monitoring system to underground pipeline using IMU (Inertial Measurement Unit) sensing technique was developed. Three-dimensional coordinates obtained from the developed system were compared with three-dimensional coordinates obtained from using total stations and levels. when compared with the results, maximum error of the horizontal and vertical positions were 7cm ,14cm respectively. In our Country, tolerance error of underground utility surveying is ± 30cm. Therefore, the developed system is expected to be utilized the underground pipeline location surveying .
This study is based on those data gathered on a 450m-long railway with a VRS GPS. In addition, certain location data on a railway were gathered through three 'Continuous VRS GPS' measurements and one 'Stop & Go VRS GPS' measurements while a railway-maintenance vehicle with GPS receivers mounted on its left & right sides was moving, Based on these location data, an average inter-rail space was analyzed. As a result of the analysis, the inter-rail space ranged from 1480mm to 1530mm. Based on the standard design dimension of an inter-rail space equal to 1,500mm and the average VRS GPS accuracy of ±3cm permissible in South Korea, the range was acceptable. Furthermore, if the center of a GPS receiver is placed over the vertical line of a rail center, more accurate location data on the railway could have been gathered.
The purpose of this Study is to analyze the accuracy of a network RTK GPS, by performing taping, triangulation & Network RTK (Real Time Kinematic) GPS observation on certain measuring points and comparing all locational data based on the calculational & geometric solution method. The deviation in the measured length & coordinate between the steel tape and the Network RTK GPS was within 2cm while the deviation in the measured coordinate between the triangulation and the Network RTK GPS was within 3cm. With the fact that the performance of the taping or the triangulation is less sensitive to its surroundings taken into consideration, it could be concluded that an average locational accuracy of most Network RTK GPS processes in Korea was within 3cm.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.