Applied Landsat-5 TM and Vector Data through Computerized Techniques in Developing Forest Maps and Forest Cover Maps at Thung- Saliam District, Sukhothai Province, Thailand.
Thung-Saliam district in Sukhothai province is a district in nrhtern part of Thailand locating between latitudes 17°33′ 19.19″ N-17° 33′ 23.31″ N and lontitudes 99° 22′ 37.08″ E-99° 46′ 21.94″ with total area of 456 sq. km.
Topography and Geology
Topographically , Thung-Saliam district is characterized by fault block basin which being type topography of the northern part of Thailand. The area which is laying on the upper north of Piitsanulok Kamphaengphet basin consists of 2 features of topography-alluvium plain in the east and mountainous area in the west. The area underlain by meta-sediment and sedimentary rooks partly volcano pyroclastic rocks of late ploeozoic to early Mesozoic ages.
The rocks in Thung-Saliam area can be catagoried into the following types.
The oldest units, namely Don chai Group consist of quartzite, phyllite, schist sandstone, fuff. Limestone lens of low grade metamorphic to sedimentary rocks, Silurian-Devonian in age. This rocks unit forms small hill and low mountain range laying on the eastern part of the area.
The carboniferous sedimentary rock, mae Tha Group composes of
sandstone, shale chert and conglomerate overlain on the Don Chai Group.
Thung-Saliam Formations, mainly, limestone bedded to thick bed well
laminated and recrytalline in texture, form the karst topography which is characterized the area this until interpreted to be Permo Carboniferous in age.
The Triassic Sedimentary rock, Hong Hoi formation, cover the western part of the area where the topography is characterized by mountain range.The Hong Hoi formation consists of greenish gray shale, sandstone, tuff and pyrcolastic On the hill stope and high terrace this area cover by gravel, sand silt and clay while on the alluviun place it is characterize by sand, silt mud and conglomerate.
The study area is under monsoonal climatic condition influenced by prevailing southwest tradewinds alternated with irregular depression in rainy season (May to October), northeast winds bring coldness and drought from mainland china in cold period (November-January) and hot season (February – April) is doldrums period. The average amount of rainfall is about 1300 mm/annum with average raining days of 122/year.
Due to climatic condition, soil type and altitude of this study area, the existing forest type are mainly deciduous.
Materials and Sources of Data
The following information and data including material are needed in the study
Topographic maps of scale 1:50,000 and 1:125,000
- Landsat-5 TM imagery of scale 1:250,000 (FCC) taken on 4 April 1994
- Computer Compalible tape (CCT. tape)
- Hardware-Sun Ultra 1 workstation with software EASI/PACE and
- Field data obtained from ground check.
A.. Hardware and software
Sun Ultra- 1 workstation with operating system “Solaris” version 3.5.1
- microprocessor Ultra SPARC with 167 MHZ
- Memory 128 MB
- Hard Disk 2.1 GM
- CD-ROM Drive
- Floppy Disk Drive Internal 1.44 MB
- Color Monitor 20″
- HP design Jet 750 C Plus Printer
- Storagetek Reel Tape Drive
- Magnetic Optical 2.6 GB
- Exabyte 8 mm
- Yamaha CD-R and gear software
- Calcom Drawing Board III, 16 Bttom, Cursor – corded
- Powerback UPS
The package software “EASI/PACE” version 6.2.2, produced by the PCI company, Canada.