使用MODIS监测火点的几个问题探讨

A Discussion About Fire Monitoring With MODIS Data

1998年Kaufman等人提出了基于MODIS的火点监测算法,2001年国内研究者也在这方面进行了研究。本文在此基础上提出了其中一些值得注意的问题:1.可以利用MO-DIS第七波段对高温敏感、对中低温不敏感的特点来确定火势;2.波长4um附近的20,22,23波段虽然很容易饱和,但是在火点探测方面也有可用之处;3.火灾初期大部分为点状目标,在进行重采样时最好采用最近邻法以保证数据准确性。

Kaufman et al. developed a fire monitoring algorithm based on MODIS data In 1998 and Chinese researchers began to do fire monitoring with MODIS in 2001. In this paper some problems about fire monitoring were discussed： 1. MODIS band 7 is sensitive to high temperature, not sensitive to mediun and low temperature, and this can be used to verify fire intensity; 2. MODIS band 20, 22, 23 are all around 4um wavelength and easy to saturate, but they can still provide some useful information when saturated; 3. Fires usually are spot targets and it is better to use the nearest method when resampled.