【摘要】 网格化求交是GIS中海量矢量数据求交的常用方法,网格尺寸的确定是直接影响其效率的关键步骤.针对网格尺寸的确定问题,对网格化求交的耗时和矢量数据的线段长度分布(线段平均x、y方向长度,线段最大x、y方向长度等)、线段密度进行了相关分析,在此基础上确定了最佳网格尺寸的主要影响因素:线段平均x、y方向长度和线段密度.通过大量实际GIS矢量数据的求交实验,给出了最佳网格尺寸的计算方法,并得到了成功应用.更多还原

【Abstract】 Grid intersection is a common method for mass vector data intersection in GIS, the key step to determine grid size affects the efficiency directly. For determining grid size, a correlation analysis of intersection time and line length distribution(average line length in x & y directions, maximum line length in x & y directions, etc), line density of vector data is made, based on which the main factors that affect the optimal grid size is determined: average line length in x & y directions and line density. Through many intersection experiments of practical GIS vector data, a method for calculating the optimal grid size is presented, which gets a successful application.更多还原