Pre-seismic Survey of Mapping Control Points in ResurveyArea Using TWD97 system -Using 13 Sections Including Jenai Section,Puli, as an Example

• Main Authors: Chang-Rong Jeng, 鄭長榮
• Other Authors: Szu-Pyng Kao
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/12754971782557518856

碩士 === 國立中興大學 === 土木工程學系所 === 98 === After the 921 Earthquake occurred in 1999, the relative position of original satellite control points and mapping control points have been changed due to collision, distortion, dislocation and other factors.Therefore, in land survey correction, the arranged mapping control points before earthquake cannot be restored for survey. TWD97 is often used to reconstruct mapping control points in the resurvey area, but this system cannot integrate with survey using TWD67 before earthquake. This study aims to solve this problem. This study adopted periphery triangulation points of the experiment area and pre-seismic basic control points as basis for reconstruction of basic control points. The remaining point position which serves as common points and rearranged basic control points were used for static survey of GPS satellite positioning. Furthermore, trilateration survey was used to calculate error compensation of survey girds. Comparison analysis was conducted for coordinates of common point location of basic control points before and after earthquake to find out the ground movement after earthquake and evaluate feasibility of design schemes. According to the evaluation results, TWD97 was used to survey and reconstruct mapping control points after disaster, and single traverse survey was used to recalculate TWD67 coordinates of point location. The bundle adjustment was used to restore TWD67 coordinates system before earthquake, and extract conversion parameters and standard deviations of common points so as to provide results of TWD97 coordinates system and TWD67 coordinates system for future reference for arrangement of mapping control points in disaster area. The results indicated that four parameters model and least square method is desirable. Average precision of the conversing results of values in the resurvey areas was within ±6 cm, which meets the precision requirements of land survey correction stipulated in Article 73 of Regulations for Cadastral Survey.