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Forestry
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Forest Fires Monitoring and Assessment
by using TM Images
Results
- The result of the study reveals that the false color composite of TM bands 457/BGR showed clearly the forest fire such as : active flame as red yellow, burn area in brown, deciduous forest in greeish yellow and evegreen forest in blue (Figure 2)
Figure 2 Landsat TM band 457/ B G R recorded on March 6, 1994. Burnt area : brown, active flame :
red-yellow, evergreen forest : blue and deciduous forest : greenish
- The The affected forest area from forest fire as interpreted from Landsat imagery recorded in late dry season in 1988, 1989, 1990, 1991, 1992 , 1993 ad 1994 are approximately 445 sq. km. 160 sq. km, 0 sq. km. (no forest fire) 400 sq. km. 980 sq. km. 40 sq. km and 1,144 sq. km. Respectively (Figure 3)
Figure 3 Burnt forest areas derived from interpretation of Landsat TM recorded in 1988 - 1994.
- Forest fire in HKKWS in 1994 was found to be more severe than ever. It afects the forest ecosystem such as vegetation soil water air scenic beauty and wildlife. It was found that the forest fire is more disadvantaged than advantaged. On eonomic aspect dry dipterocarp forest and mixed deciduous forest have been valued to have a monetry average of about US $ 100,000 per sq. km. (Ketpraneet and et. Al. 1991) So, the deciduous forest of HKKWS was totally US$ 1,144 milion lost.
Conclusion
It is importaint to select proper spectral bands such as IR bands of Landsat TM ie. 457/B G R for forest fire monitoring and assessment. This combination yields andd excellent representation of forest fire particulary on active flame that should be useful for forest tendings and forest fire control activities. Satellite imagery could help enhance forest fire research emphatically on fire behavior for further utilization in forest fire control planning.
Reference
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Ketpraneet, S. ad et. al. 1991. Forest Fire and Effects of Forest Fire on Forest System in Thailand Kasetsart Uiversity, Bagkok, Thailand.
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Nakhasathien S. and B. Stewart Cox 1990 Nomination of the Thung Yai Huai Kha Khaeg Wildlife Sactuary to be a UNESCO world heritage Site. Wildife conservation Divisio, Royal Forest Department. Bangkok, Thailand.
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