方向性分析窗口應用於地形計測之研究

Application of Directional Analysis Window in Geomorphometry

10.29417/JCSWC.202112_52(4).0002

吳俊毅(Chun-Yi Wu)；張軒瑄(Shuan-Shuan Chang)；李承軒(Chen-Shuan Lee)

地形特徵 ； 地形計測 ； 分析窗口 ； Topographic Characteristics ； Geomorphometry ； Analysis Window

中華水土保持學報

52卷4期（2021 / 12 / 01）

196 - 204

繁體中文

地形計測被廣泛應用在判釋地形特徵，而目前在較細微的地形特徵上，容易因為多方向的窗口計算方式，使特徵無法凸顯。因此，本研究嘗試利用單方向性分析窗口進行坡度與地形開闊度的運算和分析，並與多方向性窗口進行比較，且根據地形特徵設定因子的門檻值來提取地形特徵範圍。結果顯示，垂直特徵方向的單方向性分析窗口較多方向性窗口有更佳的提取結果，而坡度與地形開闊度因子分別影響特徵線段的連續性以及雜點的多寡。

Geomorphometry is widely used in topographic characteristic interpretation. However, the interpretation of some subtle topographic characteristics by using the multidirectional analysis window method is difficult. Therefore, this study attempted to use the unidirectional analysis window method to calculate the slope and surface openness of grids in the research area and to compare the analysis results with those of the multidirectional analysis window method. In addition, we set the threshold values of the aforementioned two factors according to topographic characteristics to extract the feature line. Unidirectional analysis window, which is perpendicular to the direction of topographic characteristics, produces better extraction results than multidirectional analysis window. Furthermore, the results showed that the threshold values of the slope and surface openness affected the continuity of the feature line and the amount of noise point, respectively.

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