高分四号卫星影像生成的澳大利亚森林火灾监测图

封面图片为基于2020-01-11高分四号卫星获取的澳大利亚森林火灾影像，利用着火点自适应阈值检测方法生成的森林火灾监测结果图，空间分辨率为400 m。高分四号卫星是我国首颗地球静止轨道高分辨率对地观测光学遥感卫星，具有普查、凝视、区域、机动巡查4种工作模式，其搭载的全色/多光谱相机（简称PMS）空间分辨率优于50 m，单景成像幅宽优于500 km，中波红外相机（简称IRS）空间分辨率优于400 m，单景成像幅宽优于400 km。高分四号卫星可以提供中国全境和周边国家的高时效、高分辨率的观测数据，能以分钟级甚至秒级间隔进行高频率拍摄。高分四号卫星已为中国及周边区域的灾害风险预警预报、森林草原火灾监测、地震构造信息提取、气象天气监测等业务补充了全新的技术手段，开辟了中国地球同步轨道高分辨率对地观测的新领域。本期 “林火预警监测与评估” 专栏集中介绍国内森林灾害研究团队的近期研究进展，以期引发促进相关工作的研究推进、难点探讨和成果应用。

Australian Forest Fire Monitoring Map by GF-4 Satellite

The cover image shows the forest fire monitoring result produced by the adaptive threshold for active fire identification on the basis of the GF-4 PMI image of Australia, which was obtained on January 11, 2020, with a spatial resolution of 400 m. The GF-4 satellite is the first geosynchronous orbit optics remote sensing satellite with a high spatial resolution in China. It has four observation working modes, including general, stare, regional and mobile patrol. This satellite is equipped with a panchromatic/multispectral camera (PMS) with a resolution of 50 m and swath of over 500 km, and medium wave infrared ray (IRS) with a resolution of 400 m and swath of over 400 km. It can provide high-efficiency and -resolution observation images throughout China and surrounding countries and has provided new technical methods for disaster risk warning and forecasting, forest and grassland fire monitoring, seismic structure information extracting, and meteorological monitoring in China and neighboring regions. The special issue “Dynamic Monitoring and Evaluation of Forest Fire” focuses on the recent progress of the domestic forest disaster research teams, with a view to promoting research advancement, difficulty discussion, and achievement application of related works.