华北平原秸秆焚烧火点的MODIS影像识别监测

本文利用Terra/MODIS 1B级数据,基于火点像元亮温特征及其与背景亮温的偏差来提取华北平原秸秆焚烧火点信息。文中采用MODIS 1B 500m分辨率下的第1、4、3波段反射率产品进行RGB合成,基于GIS平台叠加火点信息和地理基础数据生成华北平原5省2市秸秆焚烧火点分布图。本文结合火点分布图对研究区2007年6月17日和18日的火点数目进行了统计:结果表明,河南、河北地区的火点较多,山东、河南等境内火点数目分布区域有较大扩展。通过遥感监测秸秆焚烧信息,可为环境监测部门提供环境监测数据;同时能提高秸秆焚烧预警和日常监控能力,兴利保护生态环境。

Monitoring Fire from Crop Residues Burning with MODIS Data in North China Plain

Based on the fire pixels brightness temperatures characteristics and their difference with background,the fire-points from crop burning were picked up by fire detection algorithm with MODIS 1B data for the North China Plain.The fire-points from crop burning detection algorithm uses the neighboring pixels to estimate the radiometric signal of the potential fire pixel.The brightness temperatures were derived from the 4-and 11-μm channels.Together with geographic data and fire information,the fire distribution map of the North China Plain was got with the MODIS 1,4 and 3 bands reflectance product.The intersect operation was used to count number of fire-points from crop residues burning in North China Plain on Jun.17th and Jun.18th of 2007 with ArcGIS.The results show that the fire-points from crop residues can be found for these two days,and most of the fire-points were detected in Henan and Hebei provinces;and the number of fire-points has an increasing trend in Henan and Shandong provinces.Remote sensing can be used to detect the fire-points from crop residues burning at regional scale.It will improve the efficiency of prohibiting crop residues burning.