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This study aimed to identify the wildfire area occurred in 1998, to assess forest recovery and to analyze the physical factors affected the restoration of national parks and wildlife sanctuaries in Loei province by using Landsat imagery in time series during 1999-2017. The images collected in 1998 were used to extract wildfire areas using the differenced normalized burn ratio (dNBR) in order to analyze the forest recovery during 1999 to 2017 with the burn recovery ratio (BRR). Five levels of BRR were identified including very good, good, moderate, poor, and very poor. The correlation between the recovery index and physical factors, i.e. rainfall, temperature, relative humidity, distance from the village, and distance from national park office, was analyzed. The result showed that the accuracy of wildfire area map was reliable as 86 %. Phu Luang, Phu Rue and Phukradueng parks were the highest wildfire areas as 2.94, 0.87 and 0.53 %, respectively. The assessment of forest recovery demonstrated the overall accuracy as 87 %. There was rapidly increase as 43 % in 2011 due to the reforestation activities. The recovery slightly decreased by 14 % in 2002 due to the El Nino phenomenon. Furthermore, the distance of national park office was higher correlation (r = 0.65) than other factors. This research can be used to plan forest resources management and to recover deterioration of forest resources.
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