著者

横山 隆三 白沢 道生 菊池 祐

出版者

一般社団法人 日本写真測量学会

雑誌

写真測量とリモートセンシング (ISSN:02855844)

巻号頁・発行日

vol.38, no.4, pp.26-34, 1999-09-02 (Released:2010-03-19)

参考文献数

9

被引用文献数

17 19

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Overground-openness and undergroundopenness are defined for a grid point on digital elevation models. The former is a characteristic quantity to describe sky extent over the point within a distance L and takes large values for convex landf orms. The latter is to describe underground extent and takes large values for concave landforms. These concepts are applied to 50m-mesh digital elevation model of Mt. Iwate to make openness maps of L=5km and L=0.5km. The maps were found useful to represent topographical features such as the lines of ridge and valley.