Fengyun/Medium Resolution Spectral Imager-II (FY-3D/MERSI-II) global fire products can be used in real-time monitoring of forest and grassland fires, straw burning, and other biomass burning worldwide. This paper discusses FY-3D/MERSI-II global fire products, including the methods, product contents, and applications.Fire spot discerning considers several conditions, such as cloud contamination, cloud edge, and thin cloud influences. Subpixel size evaluation uses a single channel with fire temperature set to 750 K. Fire intensity level is established on the basis of Fire Radiative Power (FRP) and is calculated using sub-pixel size and fire temperature. Daily global fire products with 0.01° spatial resolution are generated, and global monthly fire spot density maps with 0.25°×0.25° grid points are produced monthly on the basis of the results of automatic global fire spot discerning.We selected the results in several typical areas, including Northeast China, Russian Far East, South America, and South-central Africa, from May to June 2018, and compared them using interactive fire spot discerning as the truth to verify the accuracy of automatic fire spot discerning in Fengyun/Medium Resolution Spectral Imager-II (FY-3D/MERSI-II) global fire monitoring. The statistical analysis results show that the accuracy of the automatic fire monitoring algorithm reaches more than 95. The daily FY-3D/MERSI-II global fire products include fire location, subpixel size (in hectare, temperature, fire intensity level, and FRP. Two application examples are introduced, where the first example is for monitoring the huge wildfire that occurred in California, US in 2018, and the second example is for analyzing the temporal and spatial changing features of wildfire around the Arctic Pole circle in the summer of 2018.The FY-3 global fire spot discerning algorithm considers various weather and underlying conditions, making it suitable for fire monitoring in different regions of the world. The results show that the proposed algorithm has good accuracy. The rich detection information and global observation ability of FY-3 meteorological satellite reach the international advanced level of forest and grassland fire monitoring. FY-3 global fire product can be used for disaster prevention and mitigation, climate change, and ecological environment protection worldwide. In future studies, we will develop methods, such as burned area assessment and estimation of biomass carbon emissions, smoke impact prediction, and forest and grassland fire risk warning. FY-3 meteorological satellite will play a huge role in global wildfire monitoring and early warning and prediction services.

remote sensing;FY-3;fire monitoring;middle infrared channel;global;daily and monthly products