簡化e-GNSS地籍測量作業程序之探討──以北部實驗區為例

Evaluation of simplified e-GNSS operating procedure for cadastral surveying: case study on North Taiwan

隨著GNSS的發展成熟，一般使用GNSS靜態測量來獲得圖根點及坐標資訊。近年來，使用網路即時動態定位技術已成為趨勢，具有即時性及便利性，且臺灣從原有的e-GPS升級到e-GNSS可進一步提升效率，因此，本研究的主軸為探討e-GNSS系統利用簡化流程觀測加密控制點及圖根測量，分析測量點位精度。將e-GNSS系統（使用TAIWAN系統及TTG_TWD97系統）中用於圖根點測量中，研究區域在桃園航空城及新北市樹林地政事務所轄區範圍測量，與已公告確定之TWD97圖根坐標進行比較，本研究分別使用Case A（接收180筆固定解，兩次相隔一小時）及Case B（接收10筆固定解，共收十次，每次需重新初始化）兩種方法，分析測量時間和精度的關係，兩者成果皆符合現有作業規範。本研究認為Case A精度相對Case B高、但Case A較耗時間、Case B較省時間，需要高精度部分建議採行Case A，工作可允許誤差大於10%左右，且效率較高者，建議可採行Case B的簡化作法。 With the development of GNSS, people often use static positioning to get mapping control point and coordinates data. For the past few years, the use of VRS-RTK technology has become a trend with its instantaneity and convenience. Besides, Taiwan moves forward from using e-GPS to e-GNSS, which improves work efficiency a lot. Therefore, The purpose of this study was to investigate using e-GNSS simplified-process measuring densification control point and supplementary control survey. And analysis accuracy of the observation result. Our study area was in the jurisdictional area of Taoyuan Aerotropolis and Shulin Land Office. Applying e-GNSS system (using TAIWAN system and TTG_TWD97 system) to the surveying of the root point, and Comparing our results with TWD97 map root coordinates (which have been announced). In this thesis, we used Case A method (receiving 180 fixed solutions, with a one-hour interval between each) and Case B method (receiving 10 fixed solutions, each requiring re-initializations) respectively to analyze the relationship between time measurement and accuracy. Both results are in line with existing operation. It was discovered that the accuracy of Case A is better than Case B, however, it takes more time. As the result, in case of high-accuracy demand, Case A is suggested. Otherwise, if the task range of allowable error more than 10%, which has higher efficiency, Case B was suggested.

With the development of GNSS, people often use static positioning to get mapping control point and coordinates data. For the past few years, the use of VRS-RTK technology has become a trend with its instantaneity and convenience. Besides, Taiwan moves forward from using e-GPS to e-GNSS, which improves work efficiency a lot. Therefore, The purpose of this study was to investigate using e-GNSS simplified-process measuring densification control point and supplementary control survey. And analysis accuracy of the observation result. Our study area was in the jurisdictional area of Taoyuan Aerotropolis and Shulin Land Office. Applying e-GNSS system (using TAIWAN system and TTG_TWD97 system) to the surveying of the root point, and Comparing our results with TWD97 map root coordinates (which have been announced). In this thesis, we used Case A method (receiving 180 fixed solutions, with a one-hour interval between each) and Case B method (receiving 10 fixed solutions, each requiring re-initializations) respectively to analyze the relationship between time measurement and accuracy. Both results are in line with existing operation. It was discovered that the accuracy of Case A is better than Case B, however, it takes more time. As the result, in case of high-accuracy demand, Case A is suggested. Otherwise, if the task range of allowable error more than 10%, which has higher efficiency, Case B was suggested.