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[1]YANG Guang,LI Qing-he,SUN Bao-ping.An Uncertainty Analysis of Terrain Features Derived from DEM with Different Precision Based on GIS-Taking the South Mountain Areas of Yanchi County as Example[J].Research of Soil and Water Conservation,2008,15(05):57-60.

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An Uncertainty Analysis of Terrain Features Derived from DEM with Different Precision Based on GIS-Taking the South Mountain Areas of Yanchi County as Example

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 15 Number of periods: 2008 05 Page number: 57-60 Column: Public date: 2008-10-20

Title:: An Uncertainty Analysis of Terrain Features Derived from DEM with Different Precision Based on GIS-Taking the South Mountain Areas of Yanchi County as Example

Author(s):: YANG Guang¹, LI Qing-he², SUN Bao-ping³; 1. College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Huhhot 010019, China;
2. Inner Mongolia Water Supervision Service Center, Huhhot 010020, China;
3. College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China

Keywords:: Digital Elevation Model(DEM); terrain features; uncertainty analysis; geographic information system(GIS)

CLC:: TP79;P941.75

DOI:: -

Abstract:: Taking DEMs which were made from the topographic maps of 1:50 000 and 1:100 000 map scaled as study cases, five indices including the terrain slope and aspect, soil roughness, ravine density, slope length from DEMs are derived, compared and analyzed. Taking the south mountain area of Yanchi county as a test area and ARC/INFO as a main working platform, the results show different errors can be found in terrain slope and soil roughness derived from two precision DEM, but in ravine density and slope length the difference is not significant. A kind of method is brought forward to derive ravine density and slope length from DEM with geographic information system software. The results of this study can be used to guide the error-rectifying and the accuracy-evaluation of the DEMs in practical applications.

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