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林火扩展具有时间和空间特征。对火场模拟必须建立在空间背景数据库之上，即在地理信息系统和遥感技术的辅助下完成。森林火灾的发生发展有内在和外在因素的影响，内在因素包括了可燃物类型、可燃物湿度、地形，考虑这些因素形成了像元尺度植被燃烧基本历时图；外在因素主要是气候的影响，文中利用生成的植被起火概率图控制像元是否起火。在火场扩展中将Ｒｏｔｈｅｒｍｅｌ模型和经验模型结合使用，并考虑了坡度和风向带方向的因素的影响。最后利用迷宫算法在计算机上实现了火场在地理信息系统支持下的空间蔓延动态模拟。
Forest fire expansion has time and space characteristics. Fire simulations must be based on a spatial background database, with the aid of GIS and remote sensing technologies. The occurrence and development of forest fires are affected by internal and external factors. The internal factors include the type of combustibles, the humidity of combustibles and the topography. Considering these factors, the basic time-history of vegetation burning at pixel-scale is formed. The external factors are mainly the influence of climate In this paper, we use the generated probability map of vegetation fire to control whether the cell is on fire or not. The Rothermel model is used in conjunction with the empirical model for fire expansion, taking into account the effects of slope and wind direction. Finally, using the maze algorithm to realize the dynamic simulation of space spread under the support of geographic information system in the computer.