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The data of polar-orbiting meteorological satellites and geostationary meteorological satellites from 2021 to 2022 were used, combined with land use types and administrative boundary vector data, and contextual inversion algorithms to adjust the key thresholds for fire point identification and monitor straw hot spots. UAVs and others tested the positioning accuracy, hot spot fire authenticity and hot spot classification results of satellite hot spot monitoring. The results showed that: satellite fire monitoring and hot spot classification were basically correct, and the positioning deviation was within 300m. The inversion method of satellite hot spot and the performance results are reliable. The high-incidence areas of straw hot spots in Hunan are located in the Dongting Lake Basin, Hengyang-Shaoyang-Loudi area, northern Yongzhou and eastern Chenzhou. The straw burning phenomenon was more serious in 2022 than that in 2021, and the high-density distribution range of straw hot spots was significantly expanded compared with 2021. There are two concentrated periods for straw burning: January to April and October to December. The number of straw hot spots in January, October and December accounts for 66.1% of the whole year. The daily distribution of straw hot spots is single peak. The number of straw hot spots began to increase rapidly at 11a.m and reached the peak at 14p.m. After that, the number of hot spots decreased rapidly, and the phenomenon of straw burning at night was significantly reduced.
Zhou et al. (Mon,) studied this question.