摘要
选取了10个新疆火灾EOS/MODIS卫星遥感监测实例,在分析MODIS光谱数据的基础上,结合火场实况,进行了深入研究,结果表明:①由RGB 7.2.1通道合成影像可以发现火场。利用21～31通道差,可确定火场,但当中红外各通道不饱和时,则选择20～31通道差更为有效。截取MODIS光谱数据分析窗,做相应的判识则是最有效的手段。②火点判识参数(阀值)要根据气候和地理的不同来调整,灵活准确的调整参数是发现火点的关键。③将7通道、21通道数据点对点像元重合,可以判断火势当前位置和移动方向。④火灾遥感监测只能提供即时火场面积,通过截取光谱数据分析窗,计算火区像元数,即可估算即时火场面积。
This paper selected 10 examples of fire disaster in Xinjiang by EOS / MODIS （Earth Observing System/ Moderate Resolution Imaging Spectroradiometer） and analyzed the spectroscopic data of MODIS, and combined what to be actually happening of fire sites and to have carried out thorough research. The results showed that： The results showed that： （1）Fire sites can be found from MODIS three channel （7.2.1） composite images. By using the difference between Channel 21 and Channel 31, the sites can be identified; but when infrared channels are not saturation, it is more effective to choose the difference between Channel 20 and Channel 31.To intercept MODIS spectral data analysis window and then to do corresponding identification is the most effective means. （2）The fires identification parameters （threshold） should be adjusted by the different climate and geography. To adjust parameter flexible and accurately is the key of finding fire sites. （3）The coincidence of data point and point pixel of channel 7 and channel 21 can be used to judge the current sites and direction of the fire. （4）Remote monitoring of the fire can only provide instant fire areas. By intercepting spectral data analysis window, the pixels in the fire district can be calculated, then, the instant fire area can be estimated .
出处
《沙漠与绿洲气象》
2008年第3期25-28,共4页
Desert and Oasis Meteorology
基金
中国沙漠气象研究基金(sqj200707)
新疆人影基金研究项目(200703)
中国气象局气象新技术推广项目(CMATJ2005M24)资助
关键词
MODIS
火灾遥感监测
光谱数据分析窗
MODIS
fire disaster by remote sensing monitoring
MODIS spectral data analysis window
