| In recent years,frequently appear grassland fire in Mongolia,fire by the northwest wind spread to the territory of china and serious threat to the pastoral areas of china grassland ecology and social security.Aimed at the grassland fire in China Mongolia border area,using multi-source remote sensing data(Himawari8/AHI,NOAA/AVHRR,FY-3/VIRR,Landsat8/OLI,NPP/VIIRS Active Fire and FY-3/VIRR fire identification data),through the example analysis method for real-time monitoring of grassland fire.Results show that:The use of multi-source remote sensing data in this study,the Himawari8/AHI and NOAA/AVHRR data has high time resolution.Although the cloud cover of image is larger,but very sensitive to high temperature fire point.So these data are mainly used in fire monitoring.FY-3/VIRR image has low spatial resolution,but to distinguish the burned area accurately,and Landsat8/OLI data in the space of the high resolution of objects more accurately,simple processing steps.So these two kinds of data can be the key application of in extraction burned area.More comprehensive use of multi-source remote sensing data through the increase density in temporal and spatial resolution to monitoring fire point,time resolution by each day increased to each hourly,from each hourly to each minute.The spatial resolution was increased from 2km to 1km,and then increased from 1km to 500 m,and then the resolution of 30 m was improved by 500 m.Therefore,it can be more accurate to monitor the movement of fire points,a more comprehensive understanding of the changes in the burned area,more dynamic monitoring of the spread of the fire direction,the path of change and estimate the speed of movement of the fire.Based on the analysis of satellite remote sensing monitoring and burned area estimation method,analysis grassland fire from March 29 th to 30 th in 2016 in East Ujimqin banner for example.The results show that,the 29 th 03:20 for the first time to monitor the fire point,approximate location in116°47?-116°52?E and 46°22?-46°17?N range.Until the 09:20,fire from the northwest to southeast direction,and the total burned area of 230 km~2,burned area in roughly116°48?-117°12?E and 46°20?-46°6?N.March 30 th at 04:00 for the first time to monitor the fire point,the specific location in the range of 117°7?-117°11?E,46°20?-46°6?N.To 09:30 minute the fire spread from west to East directed,at this time the monitoring result is burned area was 343.27km~2,burning area has 35.84 km~2.The final extraction of the total burned area is 733.17km~2,the range is 116°50?-117°40?E and 46°22?-46°5?N.Combined with the monitoring results of fire case and elements of conventional meteorological,factors of regional environmental information to evaluated the monitoring results,results indicated that the real-time monitoring results matched with the at the time wind speed and wind direction of the surrounding,and mutual inspection of multisource and multi-temporal data as well as between the high time resolution data using the monitoring method the results as excellent,good effect.Therefore,the method of using multi source remote sensing data to real-time monitoring of the grassland fire has certain guiding significance for the rapid assessment of grassland fires. |
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