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http://dx.doi.org/10.5532/KJAFM.2014.16.2.114

Analysis of Burn Severity in Large-fire Area Using SPOT5 Images and Field Survey Data  

Won, Myoungsoo (Division of Forest Disaster Management, Korea Forest Research Institute)
Kim, Kyongha (Division of Forest Disaster Management, Korea Forest Research Institute)
Lee, Sangwoo (Department of Environmental Science, Konkuk University)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.16, no.2, 2014 , pp. 114-124 More about this Journal
Abstract
For classifying fire damaged areas and analyzing burn severity of two large-fire areas damaged over 100 ha in 2011, three methods were employed utilized supervised classification, unsupervised classification and Normalized Difference Vegetation Index (NDVI). In this paper, the post-fire imageries of SPOT were used to compute the Maximum Likelihood (MLC), Minimum Distance (MIN), ISODATA, K-means, NDVI and to evaluate large-scale patterns of burn severity from 1 m to 5 m spatial resolutions. The result of the accuracy verification on burn severity from satellite images showed that average overall accuracy was 88.38 % and the Kappa coefficient was 0.8147. To compare the accuracy between burn severity and field survey at Uljin and Youngduk, two large fire sites were selected as study areas, and forty-four sampling plots were assigned in each study area for field survey. The burn severities of the study areas were estimated by analyzing burn severity (BS) classes from SPOT images taken one month after the occurrence of the fire. The applicability of composite burn index (CBI) was validated with a correlation analysis between field survey data and burn severity classified by SPOT5, and by their confusion matrix. The result showed that correlation between field survey data and BS by SPOT5 were closely correlated in both Uljin (r = -0.544 and p<0.01) and Youngduk (r = -0.616 and p<0.01). Thus, this result supported that the proposed burn severity analysis is an adequate method to measure burn severity of large fire areas in Korea.
Keywords
Burn severity; Large fire; Field survey; SPOT5; Maximum likelihood classification;
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