The Development of High Accuracy DEM Generation Algorithm.

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  • 高精度のＤＥＭを作成するためのアルゴリズムの開発
  • コウセイド ノ DEM オ サクセイ スル タメ ノ アルゴリズム ノ カイハツ

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Abstract

The Digital Map 50m Grid (Elevation) of Japan (J-DEM-50m) is a digital elevation model generated from 1: 25, 000 scale topographic maps by the Geographical Survey Institute of Japan. Since its publication in 1993, it has contributed considerably to various fields such as topography, geography, geology and hydrology. J-DEM50m is, however, accompanied with an unrealistic relief and spurious pits caused by shortcomings of its generation algorithm, In this paper, a new algorithm is proposed. It is characterized by (1) an increase in the number of angles from 8 to 16 for searching the steepest slope direction, (2) a composition of interpolation interval with piecewise steepest slope segments and (3) an improved identification method of slope grids. Our evaluation of contour lines reconstruction and identified slope grids from generated DEM shows that the new algorithm provided excellent results for the test areas.

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