[1]WEI Zhou,LI Guanglu,REN Lei,et al.Effect of DEM Resolution on the Micro Relief[J].Research of Soil and Water Conservation,2015,22(03):105-110.
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Effect of DEM Resolution on the Micro Relief
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
22
Number of periods:
2015 03
Page number:
105-110
Column:
Public date:
2015-06-28
- Title:
- Effect of DEM Resolution on the Micro Relief
- CLC:
- P951
- DOI:
- -
- Abstract:
- Different sampling intervals of DEM can change space surface of micro relief, and lead that the observation of micro relief shows the divergence. This paper examined the change of microtopography based on different scale of observation. In four kinds of topography, i.e. deep ploughing, zero tillage, bare slope, and rill, point cloud data at 5,10,20 mm were acquired using 3D laser scanning. Gradient, slope direction, slope variability and slope aspect variability on different scales were obtained through the analysis on the point cloud data with Geographic Information System software. The interdependency between micro relief change and observation scale was studied with slope gradient and slope aspect. And the scopes of slope gradient and slope aspect change were acquired by studying slope variability and slope aspect variability. The micro topography of different topographic condition under different scales of observation has visible difference. When the slope gradients are 8°～15°, 15°～25°, 45°～60° and 60°～90°, it changes relatively equally; the slope aspect effect of observation scale concentrates on sunny slope and semi-sunny slope; slope variability and slope aspect variability show that the smaller the observation scale is, the more apparently the slope gradient and slope aspect change, and value with range from 0～√3/3 to √3～∞ in the observation scale of 10 mm and 20 mm gradually shifts to √3～∞ on the scale of 5 mm.
- References:
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