A Comparative Study on Relationships between Forest and Soil Series upon Diferent Topographies by GIS Technique at a Mae Huad Demonstrative Forest Plot, Lampang Province, Thailand
Geographician(Cartographer) Technical Forest Bureau
Forest Resource Analysi is Branch Royal Forest Department
A compartive study on relatonships between forest types, man-made activities and soil series upon different topographies was conducted at a mae huad demonstrative forest plot, amphoe ngao of lampang province in northern thailand. The purpose of the study is to make a forest Landcover map of a Mae Huad Demonstrative Forest plot which relates to the soil ser4ies appeareeupon the different topograaphies. Byusing the data interpreted from aerial photographs and visual interpretation, the data colllected from the study area was processed and analyzed by the special program naming SPANS. version 5.3 incorporated with OS/2 operating system. The method applied in the study is based on the overly analytical techniques which were employed to solve conditons as required. The 77.62 square kilometers out of 85.56 square kilometers of the area was completely overlayed. The final outcome is an information map of relationships between forest types, and soil series upon diffeent topographies. It covers an areaa of the eergreen forest dry dipterocerp forest and lod clearing area of which are soil series for example, Ml, Li, outcrops along the foot hill and upon the mountat top . Whereas, the mixed deciduous foret teak pantation and agricultural area usuallyappeared on the pecific topography which contains soil series Ks, Tp etc in old levee Mi Li Bg etc soil series within dissected errosion surface including fans and thin layered sioilds mixed with rock outcrops on hilly and montainous area.
The world population is now increasing while world natural resources are still limited. Thus, human basic needs, for ezxample, food, shelter, dress and medicinal suply, are highldemanded. Such high demand creates a conflict among land hungers.. In lessening nearly unsolvable confilicts, rational allocation of land use and utilizaation of land resources sshould be enhanced. This guideline leads to the GIS (Geographic Information System) employment.
2. Geographic Information System Technology
2.1 GIS techonology today is considred a very important tool in land use allocation because it can offer a mean of understanding utlization dealing with jproblems of the natural resources bumanbeing need. The conflicts between the limited resources and the bhuman ever increasing requirement cause forest deterioration and change the dense forest into raid urbanized area.
2.2 GIS helps people to organize the data for solving such problems and provides an efficient mean for analyzing and systhesizing different information and maps into a homogeneous usable product.
2.3 Now the GIS technology has been developed very fast. It is widely accepted as an esential tool for the efffective utilization of geographic information
- To investigate by GIS techniques the relationaships between forest landcover and soil series upon different topographies.
- To produce a for3est landcover map of Mae Huad Demonstrative Forest plot in relation with the soil series appeared upon the different topographies.
- To search the functional feasibilities and efficiency of Everex 486/33 with Software SPANS (Spatial Analysis System package version 5.3 for process and overlay analytical technicques.
4. Study Area
A Mae Huad Demonstrative Forest Plot in amphoe Ngao, Lampang, northern Thailand, is situated between the lalitudes 18 30 – 18 35 and the longitudes 99 50 – 99 55. It approximately covers 86 square kilometers.
The climate in the area is mainly influenced by north east and south w west monsoons, and also seasonal depressions. due to the regular blows of nonsoons all through the year, Mae Huad Demonstrative Forest Plot has three different seasons the rainy the cool and the hot dry seasons. Rainfallll distribution and temperature affect greatly on the forest landcover and the soil series of different topographies of the area.
5. Source of Data
5.1 forest Type Map Scale 1:50, 000 OF 1983-1984. (Ground Truth Data had Already Been Observed and Checked in 1993)
5.2 Royal Thai survey department’s Topograhic map, scale 1:50,000
5.3. Soil Series MAP SCALE 1:100,000
6.1 Hardware and software employed.
6.1.1. Everex model 486/33
- CPU 80486, 32 bits capacity , speed 33 M Hz
- Hard disk (Internal) capacity 300 MB
- Geographic color monitor 124 x 768