澳大利亚东南部森林山火HJ卫星遥感监测

Detection of Australian southeast forest fire using HJ satellite

以2009年2月发生在澳大利亚东南部的森林山火为研究对象,利用HJ-1B遥感影像识别森林山火,分析HJ-1B在林火灾害事故中的监测能力,通过对HJ-1B IRS B07设计参数及数据特点进行分析,提出适用于HJ-1B卫星林火监测的归一化火点指数(Ku)算法.研究表明:Ku值大于0.40为潜在可能的火点像元,云耀斑和地表虚假高温点是影响林火监测的主要噪声.由于HJ-1B没有获取到研究区域未着火前的影像数据,利用MODIS(Moderate-resolution Imaging Spectroradiometer)空间分辨率为250 m的通道1和通道2计算植被指数,其结果能较好的应用于HJ-1B林火监测算法中.通过对比分析HJ-1B林火监测结果和MODIS林火产品MOD14认为,HJ-1B能更好的监测出澳大利亚东南部森林火灾,反映出火灾的局部空间分布和细节特征.

By detecting forest fire happened in Australian southeast from remote sensing imagery to demonstrate the application ability of HJ-1B satellite in disaster.After analyzing the character of HJ-1B IRS B07 system parameters and data trait,a normalized forest fire index,Ku,was constructed.Pixels are potential fore fire points where Ku are greater than 0.40.Cloud dazzling points and surface high-temperature points are the main noises disturbing the fire point detection.MODIS 250m spatial resolution band 1 and band 2 were used to get normalized difference vegetation index（NDVI） for the lack of HJ-1B data earlier than the fire happened date and its results are suitable for the forest fire detection.The compare of detection results by HJ-1B and moderate-resolution imaging spectroradiometer（MODIS） fire product,MOD14,shows that HJ-1B is better than MOD14 on presenting fire spatial structure for the reason of its higher spatial resolution,300m.