中尺度土壤预测制图中地形变量提取的适宜分辨率探讨

发布时间：2018-07-26 09:26

【摘要】：地形变量是土壤预测制图中重要的预测变量之一,为了满足中尺度土壤预测制图的精度要求,又能够减少数据的冗余,需要选择合适分辨率范围的地形变量。基于ASTER GDEM数据,对不同地形起伏状况的3个样区,通过重采样得到30 m、60 m、90 m、120 m、150 m共5组不同分辨率的DEM数据,分别选取土壤预测制图中常用的高程、坡度、平面曲率和剖面曲率4组地形变量,通过地形信息熵、局部方差均值以及比例尺和空间分辨率的关系,选取巢湖流域用于土壤预测制图的地形变量提取的适宜分辨率范围。研究表明:对于特定比例尺的土壤预测制图,地形变量的提取需要综合考虑两个因素:一是土壤预测制图的比例尺,二是地形变量提取的分辨率。中尺度土壤预测制图地形变量提取的适宜分辨率为30m,既能保留有实际意义的地形信息,又能满足土壤预测制图的精度要求。
[Abstract]:Topographic variable is one of the important prediction variables in soil prediction mapping. In order to meet the precision requirement of mesoscale soil prediction mapping and reduce the redundancy of data, it is necessary to select the terrain variable with suitable resolution range. Based on ASTER GDEM data, five groups of DEM data with different resolution were obtained by resampling three sample areas with different topographic undulation conditions. Five groups of DEM data with different resolutions were obtained by re-sampling. The common elevation and slope in soil prediction mapping were selected respectively. According to the relationship among topographic information entropy, local variance mean, scale and spatial resolution, the suitable resolution range of topographic variable extraction for soil prediction mapping in Chaohu Lake Basin was selected. The results show that the extraction of topographic variables needs to consider two factors: one is the scale of soil prediction mapping and the other is the resolution of the extraction of topographic variables. The suitable resolution for extraction of topographic variables in mesoscale soil prediction mapping is 30m, which can not only retain the topographic information of practical significance, but also meet the precision requirements of soil prediction mapping.
【作者单位】：安徽师范大学国土资源与旅游学院;
【基金】：国家自然科学基金项目(41371229)资助
【分类号】：S159.9

【参考文献】