This study was conducted by collecting information about fires that occurred in four regions of Kerman Province, including the Hanza region of Raber County with rangeland cover, the Chahargonbad region of Sirjan County with Mashjar rangeland cover, the Kouh Panj region of Bardsir County with rangeland cover, and the Khabar region of Baft County with forest cover, to investigate the ability of satellite images to identify rangelands destroyed by fire using ENVI software. First, a digital map of the four fire areas was prepared. Then, Landsat satellite images of them were prepared after the fire occurred, and georeferencing operations were performed to remove radiometric and atmospheric errors on the images. The images were classified using the supervised method in the ENVI environment. Some of the fire areas were used as training areas, and the remaining areas were used to determine image accuracy. Finally, the accuracy and precision of classification in ENVI software was eva‎luated using three indices: kappa coefficient, omission error, and commission error. The results showed that Landsat satellite images have different results in determining the areas damaged by fire in different vegetation covers. In examining the area of ​​fire areas for all four regions, none of the classifications were found to be accurate to the actual area of ​​fire areas. In the image classification, the area of ​​fire areas for the Khabar Baft region was calculated as 107.91 hectares, Henza as 12.06 hectares, Chahargonbad as 564.48 hectares, and Koh Panj as 149.67 hectares, while the actual size of the area of ​​fire areas according to field visits was 100 hectares for Khabar, 15 hectares for Henza, 600 hectares for Chahargonbad, and 200 hectares for Koh Panj, respectively. The results of the assessment of the accuracy and precision of the image classification also showed that the overall accuracy and kappa coefficient for the Khabar Baft region were 99.98% and 0.9655, respectively, for the Henza region were 99.98% and 0.9166, respectively, for the Chahargonbad region were 99.97% and 0.9628, respectively, and for the Koh Panj region were 99.99% and 0.9545, respectively. Landsat satellite images showed greater accuracy in identifying areas damaged by fire in areas with rangeland vegetation than in areas with wooded rangeland and forest vegetation. Because the fire in forested and rangeland areas was mostly superficial and the trees were not completely destroyed, it affected the spectral behavior of the land cover and consequently caused errors in the complete identification of the burned areas.

9/18/2024 12:00:00 AM

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اصغر عربي