地籍圖掃瞄數化位置精度評估之研究

Abstract

地籍圖是地政單位業務中的一項重要的基本資料，在國土資訊系統之九大資料庫中又以地籍圖之精度要求最高，然而舊圖因皺折破損嚴重，故數值化地籍圖之建置與供應，實為保存圖籍資料與推動國土資訊系統之首要工作。 本論文針對目前各界較常用之原圖掃瞄影像之地籍圖數化的作業過程，研究探討其可能之誤差來源，包含地籍圖定向之誤差、儀器之誤差、掃瞄圖籍影像向量化之誤差等，以誤差傳播原理推估地籍圖掃瞄數化之精度，並評估地籍圖本身皺折變形情形之影響。研究實驗成果可提供從事地籍數化之工作者及終端使用者一組量化的誤差分析數據，作為其後續運用時的細部考量、評估與決策的重要考慮因素。

Cadastral maps play dominant roles in land administration as their accuracy requirement is the highest among the nine databases in the National Geographical Information Systems (NGIS). However, old cadastral maps usually get wrinkled and destroyed, the establishment and supply of digital cadastral date are the most primary work for preserving cadastral map data and implementing NGIS. This paper examines possible sources of error in the processes of digitizing cadastral maps , including errors caused by orientating cadastral maps, instruments, and vectorizing on the scanned images of cadastral maps, etc, in order to estimate the accuracy of digitizing on the scanned images of cadastral maps based on error propagation principles. Meanwhile, the influence of using wrinkled cadastral maps was also evaluated. Empirical results should provide quantified information about errors digitizing cadastral map workers and end-users for their application, evaluation and decision-making in using these data .