基于DEM的坡面地形因子值自动获取方法研究

Research on Automatic Acquisition Method of Slope Topographic Factor Value Based on DEM

为实现快速、精确获取小班高程等坡面地形因子值,在ArcGIS10.2下,将等高线矢量数据采用"地形转栅格"插值法生成DEM,基于DEM提取坡向、坡度栅格后分别转换成矢量离散点数据,将点数据与目标要素类数据采用"空间连接工具"叠加分析自动获取相应的坡面地形因子值。以获取森林资源规划设计调查小班最大高程值为例,介绍坡面地形因子值自动获取的完整流程方法,精度分析结果表明,此方法快速精确。

In order to quickly and accurately acquire the slope topographic factor values of subcompartment,the contour vector data generated DEM based on "terrain - to - grid" interpolation method in ArcGIS 10.2.After extracting the slope direction and gradient grid based on DEM,they were converted into vector discrete point data.The superposition analysis of the point data and target element class data automatically obtained the corresponding slope topographic factor value by " space connection tool ".Taking the maximum elevation value of subcompartment in forest resource planning and survey as an example,this paper introduced the complete process method of automatic acquisition of slope topographic factor value which was proved fast and accurate by the accuracy analysis results.