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題 名 | 不同圖源數值高程探討:二萬五千分一經建版地形圖與農委會四十公尺數值高程模型比較=Comparing the DEM Derived from 1/25000 Topographic Map with the COA-DEM |
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作 者 | 史天元; 闕文鏈; | 書刊名 | 測量工程 |
卷 期 | 45:4 2003.12[民92.12] |
頁 次 | 頁133-144 |
分類號 | 440.911 |
關鍵詞 | 圖源; 地形圖; 數值地形高程; |
語 文 | 中文(Chinese) |
中文摘要 | 不同圖源之圖資,有不同之特性。尤其是不同比例尺之圖資,其間關係更為明顯。臺灣地區之1╱25,000圖籍,其產生並非測製,而為由1/5,000及1/10,000圖籍縮編而成。在編製過程中,會有「約化」之動作,以符合較小比例尺之需求。農委會所產製之40公尺平面解析度之全省數值地形模型,為在1/5,000像片圖製作時所掃描得之數值地形高程。本研究以此兩種圖源之地形高程資料為對象,探討其相異。由成果可見兩者間存在者正常分佈之偏差,而該偏差應主要由等高線之「約化」而產生,其百分之95排序誤差之量約為五十公尺,適好等於二萬五千分一經建版地形圖首曲線之高程間距。 |
英文摘要 | Spatial data from different sources frequently have different characteristics. The differences are particularly significant for spatial data of different scale or resolution. The maps of the 1/25,000 scale topographical map series are compiled from the 1/5,000 and 1/10,000 scale photo maps. During this map compilation process, the generalization procedure is exercised, to fulfill the requirements of smaller scale maps. The 40 m horizontal resolution digital elevation model of Taiwan, produced by the Council of Agriculture, is generated from the height measurements gathered for the ortho-rectification of the 1/5,000 and 1/10,000 scale photo map. The differences between the hypsographic information obtained from these two map sources are evaluated in this study. It is found that the differences of elevation are normally distributed. It is concluded that this differences are caused by the generalization process. The 95% ranking error of the differences is abut 50 meters, the same as the contour interval of the 1/25,000 maps. |
本系統中英文摘要資訊取自各篇刊載內容。