Land suitability maps are generally established based on individual crop types, which provides inadequate
information for land use planning. In this study, land evaluation is accomplished with the objective of
delineating units of land as to their suitability for combining economic crops with legal conservation areas.
The study area is the Chi watershed, which covers an extensive portion in Northeast Thailand with an area of
about 49,500 sq km. The major economic crops in the area are rice, sugar-cane, cassava and rubber tree. The
suitability assessment for each crop was conducted following the method described in FAO guidelines. The
land suitability for each crop was established using an overlay process of defined land quality layers. Land
suitability maps, with their associated class attributes were prepared for rice, sugar-cane, cassava and rubber
tree. In addition, the conservation areas in the watershed were also digitally encoded in GIS database.
Simultaneously, overlay process was then performed of the suitability layers and conservation areas with
selection criteria of identifying conservation area, highly and moderately suitable classes. The resultant map
obtained is a result of combination of defined suitability class of combining crops and the conservation areas.
The planning alternative that best matches land uses to the highly and moderately suitable land areas was
suggested with respect to the conservation area
KEY WORDS: Land Evaluation, GIS, Land Use Planning
Land suitability maps are generally established based on individual crop types, which provides inadequate
information for land use planning. In this study, land evaluation is accomplished with the objective of
delineating units of land as to their suitability for combining economic crops with legal conservation areas.
The study area is the Chi watershed, which covers an extensive portion in Northeast Thailand with an area of
about 49,500 sq km. The major economic crops in the area are rice, sugar-cane, cassava and rubber tree. The
suitability assessment for each crop was conducted following the method described in FAO guidelines. The
land suitability for each crop was established using an overlay process of defined land quality layers. Land
suitability maps, with their associated class attributes were prepared for rice, sugar-cane, cassava and rubber
tree. In addition, the conservation areas in the watershed were also digitally encoded in GIS database.
Simultaneously, overlay process was then performed of the suitability layers and conservation areas with
selection criteria of identifying conservation area, highly and moderately suitable classes. The resultant map
obtained is a result of combination of defined suitability class of combining crops and the conservation areas.
The planning alternative that best matches land uses to the highly and moderately suitable land areas was
suggested with respect to the conservation area
KEY WORDS: Land Evaluation, GIS, Land Use Planning
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