基于GIS的林地景观格局分析及栅格单元确定

摘要

Based on the SPOT image in study area in year 2005 and current 1 ∶ 10 000 forest diagram of the studied area, we used ArcGIS 9.2 software to construct classification diagrams of landscape based on forest classification system, we then transformed these into raster images with raster unit.In order to explore the relationship between landscape indices and scale, we used a Fragstats program to calculate every landscape index, then calculating every type of landscape index of original vector layer diagrams with Excel.After comparing the indices of raster image, we obtained the best fitted raster scale, which was 50 m.%以研究区域内2005年SPOT影像和1:10000林业现状图为基础,采用ArcGIS9.2软件制作了以林业分类系统为主要依据的景观分类图,并将其转化为栅格单元的栅格图像,运用景观格局分析程序Fragstats计算出不同尺度下的各类景观指数,以探讨景观指数与尺度之间的变化关系.然后运用Excel计算出原矢量图层各类景观指标值,并与栅格图像得出的指标值进行对比,从而选择出了适合研究区域的栅格尺寸,最优栅格尺寸为50 m.