圖解法地籍圖數值化坐標轉換成果與地籍圖重測成果比較研究

Comparison analysis of coordinate-transformed digitized graphical cadastral maps and re-surveyed cadastral maps

部分區域之圖解法地籍圖雖經地籍重測作業完成數值地籍成果，但目前仍有為數不少的圖解區地籍圖，亟待以數值法改善成果，以解決圖解地籍圖老舊、伸縮等問題。本研究以地籍現況測量數據及地籍調查表經界物查註資料，分別與地籍圖重測成果、圖解法地籍圖數值化坐標轉換成果及圖解數化成果等三種地籍圖資進行套疊分析。依據地籍重測之地籍調查表內不同之經界物類項，就現況點與經界線點位分析、現況點與界址點分析、宗地邊長及面積分析，比較上述三種不同地籍圖資之成果精度。經研究成果顯示，（1）依實地有指界固定經界物之現況點，完成圖解法地籍圖數值化坐標轉換成果之界址點點位精度，可替代地籍圖重測成果；（2）就實地有指界或未指界之宗地面積較差平均值而言，圖解法地籍圖數值化坐標轉換成果比地籍重測成果較符合原圖解地籍圖數值化成果之宗地面積，且圖解法地籍圖數值化坐標轉換成果比原圖解法地籍圖數值化成果較符合地籍圖重測成果之宗地面積。結果顯示圖解法地籍圖數值化坐標轉換成果不僅可改善老舊圖籍之精度，可過渡性替代地籍重測成果之目的，藉以縮短地籍圖重測辦理時程。 Though graphical maps of part area are resurveyed, a lot of area are still not resurveyed yet. However, that kinds of area are necessary to be cadastrally resurveyed in order to handle the compression and exaggeration problem of primitive cadastral maps. In this study, field surveyed data and cadastral reconnaissance data are used to analyze three types of maps: cadastral resurveyed map, coordinate-transformed map, and digitized graphical cadastral map. The accuracy analysis is made by comparing interested field points with boundary points, interested points and boundary lines, and side length and area of parcel in accordance with the different item data of cadastral reconnaissance. The results demonstrated that (1) the coordinate-transformed cadastral maps could be instead of the resurveyed cadastral maps in comparison to the field points with boundary points, (2) the parcel area of the coordinate-transformed map is consistent with the digitized graphical cadastral map than the resurveyed map. The coordinate-transformed cadastral maps are not only able to improve the accuracy of primitive graphical cadastral map but also instead of the resurveyed cadastral maps in stage phases. In addition, it can shorten the time span of cadastral re-survey process.

Though graphical maps of part area are resurveyed, a lot of area are still not resurveyed yet. However, that kinds of area are necessary to be cadastrally resurveyed in order to handle the compression and exaggeration problem of primitive cadastral maps. In this study, field surveyed data and cadastral reconnaissance data are used to analyze three types of maps: cadastral resurveyed map, coordinate-transformed map, and digitized graphical cadastral map. The accuracy analysis is made by comparing interested field points with boundary points, interested points and boundary lines, and side length and area of parcel in accordance with the different item data of cadastral reconnaissance. The results demonstrated that (1) the coordinate-transformed cadastral maps could be instead of the resurveyed cadastral maps in comparison to the field points with boundary points, (2) the parcel area of the coordinate-transformed map is consistent with the digitized graphical cadastral map than the resurveyed map. The coordinate-transformed cadastral maps are not only able to improve the accuracy of primitive graphical cadastral map but also instead of the resurveyed cadastral maps in stage phases. In addition, it can shorten the time span of cadastral re-survey process.