数値等高線データを用いた谷線の自動抽出と水系網の構築

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We have developed an algorithm with which to automatically generate drainage networks from a contour-based DEM that are close to those drawn manually. First, we classified the slope plan-form with C-BATM (Contour-Based Automatic Terrain Mapping, Mizukoshi and Aniya, 2002) into convergent (valley), divergent (ridge) or straight slope. At the convergent slope, the apex and two edge points of the recessed part of the contour line are located, and the angle formed by lines connecting the edge point-apex-other edge point is used as a criterion to define a valley. In the present study, we used an angle (1) less than 170°(including shallow valleys) and (2) less than 90°(deep valleys only). The apex point is taken to represent the valley bottom (called valley point), and a highest valley point (called valley head point) is located. Then a stream (valley) line is generated from the valley head point using fall line algorithms of C-BATM toward a lower contour line. We also developed an algorithm to derive the stream order with the Horton-Strahler method (Strahler, 1952) based on these stream lines. In order to analyze the longitudinal profile of stream (valley), we improved the method in C-BATM to classify slope profile-form using the stream order. These algorithms were tested in the mountainous area of Yakushima, Kagoshima Prefecture, and the results of which indicate that the algorithm is good enough for practical uses with some minor interactive corrections to make the stream network perfect.
日本地形学連合の論文
2005-01-25

数値等高線データを用いた谷線の自動抽出と水系網の構築

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