地形分析中栅格中间层构建的尺度适应性

Scale Adaptability of Raster Intermediate Layer in Terrain Analysis

栅格中间层是指在地形分析中由DEM、DSM、矢量数据等原始数据,经过一系列栅格运算获取且可以重用的基础栅格层。本文系统研究了栅格中间层构建的尺度适应性,定义了范围、比例尺、分辨率和分析4种尺度,并确定了范围、比例尺和分辨率尺度的确定原则;特别对于分析尺度,通过地貌因子计算进行了切线、剖面曲率栅格层分析尺度适宜性试验,分析了曲率计算中适宜的算法和分析尺度,保证了地形基础因子栅格中间层具有满足分析要求的数值精度和匹配地形起伏的形态精度。

Raster intermediate layer is fundamental and reusable raster layer for terrain analysis created by the DEM,DSM,vector data,which is obtained through a series of raster calculation. The scale adaptability of raster intermediate layer is studied. The range,scale,resolution,analysis are defined. The principle of range,scale,resolution are determined. Particularly,the paper takes the experiment of scale adaptability of the tangent,curvature raster intermediate layer aiming at the analysis scale,and puts forward the adaptive algorithm and analysis scale. The result shows that raster intermediate layer of terrain foundation factors created from this solution meets the need of numerical precision and morphology precision for terrain analysis.