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.
B. Methodology
Field Data Collection
Before analysis and classification, field data of the study area have been collected by random sampling the method as required by this method. These ground check information, existing vegetative and land use types will be used as the training area of those classification and will be used by supervised classification system of Maximum Likelihood Algorithm.
Analysis and Classification
Information from training area will be used to collate with the Landsat-5TM digital data (CCT.tape) by Sun Ultra-1 workstation and software EASI/PACE version 6.2.2 final digital map of the study area can be obtained (working process appears in Annex A
Annex A: Process of the Study
Result
|
| Categories | Area sqm. kms | Percentage of total |
|
| Water body | 2.15 | 0.39 |
| Paddy field | 108.99 | 19.96 |
| Cropland | 68.19 | 13.49 |
| Heterogeneous Orchard and Natural Stand | 108.14 | 19.81 |
| Completely Destroyed mixed with Degraded forest | 88.18 | 16.15 |
| Dty dipterocarps forest | 56.94 | 10.43 |
| Mixed Deciduous forest | 112.49 | 20.61 |
| Ather Areas | 0.84 | 0.15 |
|
| Area | 545.92 | 100.00 |
|
Gen erating of the digital Elevation Model (Dem ) of Thung-Saliam district, Sukhothai Province.
The important needed to generate DEM are:
Spatial data included contour lines, roads, rivers, streams, area boundary etc. (Vector data) and spot heights (dots) of study area which can be transformed into digital format by tablet digitizer and they will be installed in the computer memory as database.
Attributes data which instructed the software of the kinds and characteristics of spatial data installed previously.
The software will use all installed data in database to calculate Z- values by triangulated irregular network (TIN) method thousands of the altitude of study area can be obtained from existing heights spots and contour lines. Theses data are also kept as database.
Three Dimension Perspective View built-Up.
All spatial and derivative data will be overlaid over alndsat-5 TM digital image, colorful three dimension perspective View of the study area can be obtained by this techniques ( working process appears in Annex A). lands use, mountains, croplands disturbed forests etc. of Thung- Saliam can be seen vividly.
Conclusion
By using Landsat-5 TM imagery and CCT tape, containing Landsat 5-TM data Sun Ultra-1 workstation with EASI/PACE software version 6.2.2 fields data, supervised and unsupervised classification system forest cover and land use type map and perspective picture of the aea can expeditiously be obtained. This newly developed computer technique was one of he useful technique in monitoring forest resources changing being available in the market. The result obtained from this techniques are reliable and effective.
