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Forestry
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Study on Forest Change Detection in Eastern Forest
by Remote Sensing Technique
Study area
The area under study covers the whole area of Eastern Forest and its vicinities including Khao Ang Rui Nai Wildlife Sancturary, Khao Soi Dow Wildlife Sanctuary, Khao Khitchakoot national Park, and Khao Chamao-Khao Wong national park with a total area of approximately, 9,584.58 km 2. The area is located between 12°17'-13o30'N and 101°40'-102°6' E. Te topography of the area comprises mountain, undulating terrain and low terrace. Various types of forest were found mostly in mountain our topography including evergreen forest, mixed deciduous forest, and dry dipterocarop forest. Forest encroachment area was mainly used for agricultural purposes such as field crops, rubber, and mixed orchard. Paddy was scarcely found due to unsuitable topography.
Figure 1 Study Area
Data and Equipments
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Existing forest of 1992 at scale of 1:2550, 000 produced by Department of Royal Forestry.
- Landsat Tm color composite image, bands 3 5 4 (BFR) at a scale of 1:50,000 acquired on February 20, 1988.
- Landsat TM color composite image, bands 3 5 4 (BGR) at a scale of 1:250,000, acquired on February 1, 1993.
- Land use map at a scale of 1:100,000 produced by Department of Land Development.
- SPAN-Geographic Information System.
- Global Positioning System.
Methodology
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Visual Interpretation of 1988 Landsat TM image was performed to extract forest existing area from other land use categories.
- Visual interpretation of 1993 Landsat TM image was performed, with the supplementary information from ground truth observation, to extract forest existing area, to identified forest type, and to define land use categoriesin forest encroachment area.
- Digitization of forest existing area of 1982 Zderived from forest map), 1988 and 1993 into the SPAN GIS to assess forest area changes during each period.
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