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[1]WANG Feng,WANG Chun-mei.Research for the Influences of DEM Resolution on Topographical Factors—A Case Study of Mengyin County[J].Research of Soil and Water Conservation,2009,16(04):225-229.

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Research for the Influences of DEM Resolution on Topographical Factors—A Case Study of Mengyin County

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 16 Number of periods: 2009 04 Page number: 225-229 Column: Public date: 2009-08-20

Title:: Research for the Influences of DEM Resolution on Topographical Factors—A Case Study of Mengyin County

Author(s):: WANG Feng¹, WANG Chun-mei²; 1. Surveying and Mapping Institute of Shandong Province, Ji’nan 250013, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China

Keywords:: DEM resolution; slope; slope length; aspect; catchment area

CLC:: P962;TP79

DOI:: -

Abstract:: The influnce of DEM resolution on four topographical factors including slope, slope length, aspect and catchment area was analyzed by taking the county of Mengyin as research area. Topographical factors mentioned above were derived from DEMs with resolution of 10, 15, 20, 25, 30, 40, 50, 75, 100, 150, 200, 250, 300, 400, 500, 750, 1 000 m based on the digital map (1:50 000) by ANUDEM. The result showed that with DEM resolution reduction the average of slope decreased following logarithmic function, slope tended to be lower, slope length tended to be longer and the accretion of slope length is faster in higher resolution range, the impact of DEM resolution within 200 m on aspect is lower than 10%, the average catchment area becom larger following linear fuction and the changes of area for different range of catchment area are different.

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