The evaluation model for each crop was given using the values of the factor rating as follows:
Suitability = W x S x Sa x T These could be performed by spatial overlay with the suitability model of the defined
four layers.
The result yielded 4 classes according to the
resultant proposed in table 5.
Table 5 Suitability evaluation for rice, sugar-cane, cassava
and rubber tree.
The reliability of the suitability map for each
crop was assessed, based on the suitability maps
conducted by other agencies including the ground
truth survey. A number of approximations and the
corrections of the land unit were made. The
iteration of the process was performed to
eventually obtain a satisfactory result.