Calculation of topographical factors and their accuracy evaluations with Digital Map 50-m grid published by the Geographical Survey Institute

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  • 国土地理院数値地図50mメッシュによる地形因子の算出とその精度の評価
  • コクド チリイン スウチ チズ 50mメッシュ ニ ヨル チケイ インシ ノ サンシュツ ト ソノ セイド ノ ヒョウカ

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We calculated three topographical factors (effective relief, topographical exposure and slope-center angle) with the "Digital Map 50-m grid", a digital elevation model (DEM) published by the Geographical Survey Institute, Japan. The objectives of this study were to show new algorithms for the calculation of the topographical factors from DEM, and to evaluate their accuracy. We proposed new algorithms for the topographical exposure and the slope-center angle. Both topographical factors measured on topographical maps and calculated from DEM were compared. The Digital Map 50-m grid data were resampled by the cubic convolution interpolation. The root mean squared (RMS) error for the elevation value of the DEM was 7.15m and gave good agreement with the theoretical value (7.2m). The RMS error of the effective relief was 8.61m, the topographical exposure was 27.39 degrees, and the slope-center angle was 13.57 degrees. The correlations between the errors of elevation on DEM and the errors of each topographical factor were also examined. The errors of elevation on DEM correlated positively with the errors of the topographical exposure and the slope-center angle, and negatively with those of the effective relief.

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