Abstract:

The fire remote － sensing method based on HJ was developed by analyzing the spectral characteristics of HJ and referring to
the fire monitoring model of MODIS． The localized threshold of the corresponding channels of HJ was studied according to grassland
fires occurred in Maqu on February 10，2011 and Minxian county on December 8，2012． The study extracted the range of fire and cal-
culated the burned area through multi － temporal threshold method of the vegetation index． At the same time，the results were compared
with the burned area observations of the Grassland Management Station of Gansu and MODIS over the same time． The results show that
the threshold of the second point of fire was determined as T4＞ 310 K; the fire area from HJ satellite was 65． 3 hm2in Maqu，19． 8 hm2
in Minxian，and the measurement accuracy was 98% and 90%，respectively，which was improved by 10． 5% and 28． 9% compared
with MODIS． The HJ satellite has much higher spatial resolution，much more refined results and good applicative value．

Key words: HJ satellite, grassland fire, threshold of T4

摘要：

通过分析环境减灾卫星(HJ)的光谱特征，参考 MODIS 火情监测模型，发展了基于 HJ 卫星的火情遥感监测方法。针对甘肃省 2011 年 2 月 10 日发生在玛曲、2012 年 12 月 8 日发生在岷县境内的2 次草原火灾，研究了 HJ 卫星相应通道的本地化阈值，采用植被指数的多时相阈值法提取过火范围并计算了过火面积，同时与甘肃草原监理站的过火面积观测资料及同期 MODIS 的监测结果分别进行比对。结果表明，2 次判定火点的阈值为 T4＞310 K; HJ 卫星监测到的玛曲、岷县的火灾面积分别为65． 3 hm2、19． 8 hm2，监测精度为98%和90%，较 MODIS 监测精度提高了10． 5%和28． 9%;HJ 卫星进行火情遥感监测的空间分辨率更高，监测结果更精细，具有很好的业务化应用价值。

关键词: 环境减灾卫星, 火灾, T4阈值