Interpretation of Geomorphology and Geology Using Slope Gradation Map

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  • 傾斜量図を用いた地形・地質の判読
  • ケイシャリョウズ オ モチイタ チケイ チシツ ノ ハンドク

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Description

We produced slope gradation maps, which show dip of ground as gray scale image, from Digital Map 50m Grid (Elevation), precise DEM data covering the whole Japan. We tried to interpret geomorphology and geology using the maps. The maps are useful in interpreting geomorphology of lowlands (terraces), mountains, volcanoes and landslide areas. The maps are also useful in interpreting geology, that is lineaments suggesting tectonic line and fault, and boundary of distribution area of some kinds of rocks. Prewitt type or Sobel type operator is better than Roberts type operator to calculate dip for the interpretation. We compared slope gradation map with other types of map describing topography, that is contour map, DEM image and hill shading map. Slope gradation map is the best among them for interpreting geomorphology and geology.<BR>“Brightness, ”“uniformity, ”“line intervals, ”“sharpness” and “directional characteristics” are basic interpretation keys for slope gradation map.“Brain like pattern, ”interlocking structure of bright lines corresponding to ridges and ones corresponding to valleys on a dark background corresponding to slopes, is one of the most important interpretation key in mountains. In conclusion, slope gradation map is very important material for investigation of geomorphology and geology.

Journal

  • Geoinformatics

    Geoinformatics 11 (1), 11-24, 2000

    Japan Society of Geoinformatics

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