頁籤選單縮合
題名 | 視域計算不同程式集差異之探討=The Implementation Variation of Viewshed Computation in GIS Packages |
---|---|
作者 | 鄭卓斌; 史天元; Cheng, Cho-pin; Shih, Tian-yuan; |
期刊 | 航測及遙測學刊 |
出版日期 | 19990600 |
卷期 | 4:2 1999.06[民88.06] |
頁次 | 頁55-64 |
分類號 | 440.915 |
語文 | chi |
關鍵詞 | 視域; 視線; Viewshed; Line of sight; |
中文摘要 | 視域計算為空間分析的一種作業。由於視線之解析模式有多種,在計算時因演算法之差異、及不同程式書寫技巧之運用,會導致更進一步之差異。本研究以ARC/INFO 6.0、GRASS 4.1中之相應功能與自行開發之視域軟體View Shed(計算方法為簡易直線法)以實例進行比較測試。以目視法、差異點數法、相關係數法評估所產生之視域圖,得到三者之間相似程度之量度。 |
英文摘要 | Viewshed is a useful operation for terrain analysis. Due to the plausibility of the line-of-sight definition, the application of different computational algorithm and coding techniques, the viewsheds computed from different implementations are different. In this study, the differences of viewshed resulting from ARC/INFO (visibility), GRASS (r.los) are compared with a self-developed program ViewShed with real terrain data sets. The evaluation is performed with visual inspection, pixel count for the differences, and correlation coefficients. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。