一种基于八叉树结构表达的林火蔓延模拟方法--以黑河市泉山地营子“5.20”特大森林火灾为例

摘要

or:A forest fire spread model was established based on octree structure after analysis of geographic information system, remote sensing and spatial mathematical model techniques. Accuracy analysis of this model was carried out based on real data of forest fire on May 20, 2003 in Heilongjiang province. The results showed that the accuracy of simulated burned area was up to 86.71%and that of burned perimeter was 86%.%在研究林火蔓延机理的基础上，结合地理信息系统、遥感、空间数学模型等技术对林火蔓延过程进行了分析，建立了基于八叉树结构表达的小班林火蔓延模型，并以黑龙江省黑河市爱辉区泉山地营子2003年“5.20”特大森林火灾为例，将 MODIS 产品中 MOD14A1/MYD14A1提取出来的燃烧过程结合历史火灾记录为真值，对八叉树结构表达的林火蔓延模型进行实例精度分析。结果表明：从燃烧面积来看，模型模拟总体精度为86.71%，模拟燃烧周长平均精度为86%；从模型模拟图可以通过软件获得该火场的范围、形状和周长长度，从而实现了火场模型因素的获取。