基于空间句法的北京房山区林火分布的研究

Forest fire distribution in Fangshan District of Beijing based on the space syntax.

该文用空间句法对林火分布与道路连通度进行了研究.首先对房山区的纸质地形图进行扫描,制作房山的道路分布专题图,并将GPS采集的林火火点位置转入ArcView GIS,制作林火火点位置图;用Axwoman扩展模块勾绘了道路,进行了道路连通度的分析,并以勾绘的连通线作了1 000 m的缓冲分析;以连通度与相应的缓冲区内的林火火点数作了拟合分析.结果表明,在林火火点数与道路的连通性之间呈二次曲线关系,即连通度低的道路两侧发生的林火次数以及连通度高的道路两侧发生的林火次数少,林火主要发生在连通度居于中间水平的道路两侧.

The relationship betweenthe fire distribution andthe road connectivity was studied usingthe Axwoman.The procedure of the analysis is as follows :first,the digital road map was made based on the paper map ofFangshan,southwest Beijing,andthefire distribution map was made byinputingthefire points collected withGPSinto the GIS.The road connectivity was obtained using the Axwoman to drawlines along the roads.Buffers onthe lines within a distance of 1 000 mwere made,andthe curver fitting was analyzed betweenthefire numbers andthe road connectivity.The result shows that it is a conic relationship exists betweenthe roadconnectivity andthe fire number beside the lines.Alongthe roads with either lowor high connectivitythe firenumber is small.The paper concludesthattheforestfires mailyoccur onthetwosides of roads withanaverageconnectivity.