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１前言 目前，测量荒地火蔓延速度的技术可分为三类：即目视法，机械法和电子法。目视测量（包括照相）受两个条件限制，①必须看到发生的现象；②必须在安全的地方观测。因此，除低强度火小面积燃烧外，不能在整个燃烧区域随机选择。机械测速则是用绳子把一端系在火场中的标桩
1 Foreword At present, the technology of measuring the rate of fire spread in the wasteland can be divided into three categories: the visual method, the mechanical method and the electronic method. Visual measurement (including photography) is subject to two conditions, ① must see the phenomenon occurred; ② must be observed in a safe place. Therefore, in addition to low-intensity fire a small area of combustion, the entire combustion area can not be randomly selected. Mechanical speed is the rope tied to one end of the stake in the fire