測量觀點的地籍圖段接邊方法研究

Study towards Matching for Cadastral Maps From the Point-view of Surveying

地籍圖是國土資訊系統的基本圖資，相鄰段界間或多或少有錯開或重疊的問題，內政部國土測繪中心自2011年起進行GIS地籍圖接合對位作業工作，主要是為了地理資訊運用需求，此成果無法提供土地複丈使用。本研究為測量需求目的提出地籍圖段邊界接合方法，兼顧鄰近界址點相對精度進行接合處理，採權平均值（Weighted mean）法計算各界址點之坐標改正值，以距離或距離之開根值為倒數來訂定權（Weights），及比較何者為佳，並進行接合前後的相鄰界址點距離、接合前後的宗地面積分析比較，以南投縣四個實驗區進行驗證。由圖解區成果呈現，上述較差皆在誤差容忍值範圍內，數值區成果顯示，除修測數值區有一相鄰界址點邊長較差0.09公尺外，其餘較差皆小於0.04公尺；接合前後面積較差方面，除修測數值區有4筆宗地較差介於0.5－0.8平方公尺外，其餘皆小於0.3平方公尺，因此接合後之地籍圖應可作為後續土地複丈使用。

Cadastral maps serve as foundation of Land Information System. Boundaries of neighboring maps or blocks encounter more or less shrinkage and discrepancy problems. Since 2011, National Surveying and Mapping Center, Ministry of Interior, have made progress in matching dititized cadastral maps in order to support GIS applications. However, the matched maps are not used for land revision but for GIS. In this study, a method is proposed to match cadastral maps for the useage of land revision by taking into account relative accuracy of adjacent points. In order to maintain the relative accuracy, the coordinates of surrounding points of neighboring parcels beside the block boundary line are corrected by weighted means. The weight depends on the reciprocal of distance or the square root of the distance to the points of the block boundary line, and to make comparison with two weighted methods. In addition, the distances between boundary points and the area of parcel will be compared before-after map-matching. There are four blocks located in Nantou County, Taiwan, be tesed. Of the tested graphical maps, the results are shown that the differences of the above-metioned distances and the area are within tolerance error required. Of the tested numerical maps, except that the difference of the distance between boundary points at the trimmed numerical block reaches 0.09m, the other are less than 0.04m; except that the discrepancies of the area of four parcels at the trimmed numerical block are at the level of 0.5-0.8m^2, the other are less than 0.3m^2. Therefore, the matched cadastral maps might be used for the job of land revision.