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[1]YANG Yingnan,LI Zifu,LIU Mengyun,et al.Analysis of Topographic Differences of Yongshou County Based on Different Resolutions of DEM[J].Research of Soil and Water Conservation,2018,25(06):131-136.

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Analysis of Topographic Differences of Yongshou County Based on Different Resolutions of DEM

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 06 Page number: 131-136 Column: Public date: 2018-10-26

Title:: Analysis of Topographic Differences of Yongshou County Based on Different Resolutions of DEM

Author(s):: YANG Yingnan^1,2, LI Zifu^1,2, LIU Mengyun^1,2, ZHANG Jie^1,2, ZHANG Mengmeng^1,2, YANG Jinghan^1,2, CAO Runshan^1,2; 1. College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Northwest Key Laboratory of Plant Nutrition and Agricultural Environment, Ministry of Agriculture, Yangling, Shaanxi 712100, China

Keywords:: resolution of DEM; Yongshou County; topographic information

CLC:: P208

DOI:: -

Abstract:: High-resolution DEM can include more detailed topographical information, but the excessively detailed data could make it redundant and even cause data to be inconveniently calculated. In order to research whether different levels of resolution of the DEM (digital elevation models) has a very important practical significance on the terrain information expression, based on different scales and different resolutions of DEM, we extracted and analyzed topographical feature. The results showed that: (1) with the gradual reduction of resolution of DEM, the overall slope of the ground was decreasing, the description of the terrain was getting rough, and the topography became more and more coincident, the terrain tended to be more flattened; (2) the slope extracted from low resolution of DEM had better macro meaning, while the slope extracted from high resolution of DEM could reflect the fine orientation of the terrain; (3) with the reduction of the resolution of DEM, surface curvature could generalize regional topography better, and the mountain ridge line and valley line would be more obvious, but this would lead to loss of a lot of detail information; (4) with the decrease of the DEM resolution, the profile curvature information extracted from DEM would be dropped significantly, in other words, the decrease of the DEM resolution made the variety of terrain slope less, the turning point of the ground tend to be smooth gradually, and the characteristic of the topographic fluctuation reduce.

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