Detailed Mapping of Engineering Geomorphologic Classification Using Digital Elevation Model and Satellite Image

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  • 数値標高モデルと衛星画像を用いた地形・地盤分類メッシュマップの細密化の検討
  • スウチ ヒョウコウ モデル ト エイセイ ガゾウ オ モチイタ チケイ ジバン ブンルイ メッシュ マップ ノ サイミツカ ノ ケントウ

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<p>In order for detailed mapping of amplification factor for ground motion estimation, the 50m-mesh engineering geomorphologic classification map is estimated using the existing 250m-mesh map, digital elevation model (DEM) and satellite image for Tsurumi ward, Yokohama. The resolutions of the DEM and the image are 1m and 15m, respectively. The 50m-mesh map is estimated based on the characterstics of indices computed from the DEM and the image for each geomorphologic unit. The estimated 50m-mesh map is compared with the manually classified map. The accuracy rate is 84％ over the area. The accuracy rates for sand bar and natural levee, however, are relatively low because the differences of the indices between the units are not clear.</p>

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