30 criteria layer. Seaweed and pearl oyster use the same calculation process using
simple visual basic computer program by matching each physical parameter.
4.3 Marine Coastal Suitability using Simple Additive Weighting Method
The third phase in figure 3-3 also use in this method, then the fourth phase convert to polygon is converting raster into polygon. The process of gridcode
data which consist of 1, 2, 3, and 99 will be corrected and convert into classification criteria as S1, S2, S3, N. The fifth phase Overlay process in figure
3-3, overlay has been done in 5 stages for 6 maps. In phase weighting criteria layer of figure 3-3, the process for simple additive
weighting is calculation of each physical parameter by simple visual basic computer program. This simple program is used to calculate physical parameters
such as temperature, salinity, pH, brightness, dissolved oxygen, and depth. This method also uses indexes score and weighting as part of calculation. The total
score for each alternative physical parameter then can be computed by multiplying the comparable rating for each physical parameter with the importance weight
assigned to the attribute then summing these products. Weighting process uses numeric percentage averages between 0 to 100, and divided into several criteria of
marine coastal suitability such as classification of S1 between 80 - 100, classification of S2 between 60 – 79,99, classification of S3 between 40 – 59,99,
and classification N less than 40, as described in table 2-2.
Spatial Analysis for Seaweed and Pearl Oyster Cultivation
Spatial polygon map of marine coastal suitability is indicated by spline interpolation, as shown in figure 4-2 a for seaweed. The next process after
weighting criteria layer phase is simple additive weighting formula figure 3-3. Based on table 2-2, on marine coastal suitability for seaweed, the expert gave the
highest score for physical layer of depth 35 and second highest is brightness 25. It could be conducted that physical layer of depth is the most influential than
the other physical layers for seaweed cultivation. Calculation with simple additive weighting method results for two classes such as N class and S3 class.
31 a Seaweed cultivation
b Pearl oyster cultivation Figure 4-2. Marine coastal suitability for using simple additive weighting method
The process of seaweed cultivation uses simple additive weighting formula figure 3-3, while for pearl oyster cultivation the result of polygon map is described in
figure 4-2 b. Based on table 2-3 on marine coastal suitability for pearl oyster, the
32 expert gave the highest score for physical layer of depth 50. It could be
conducted that physical layer depth is the most influential than the other physical layers for pearl oyster cultivation. Calculation with simple additive weighting
method results for two classes such as N class and S3 class.
Figure 4-3 SAW method spatial interpolation of seaweed cultivation with point of sample
The process interpolation of seaweed cultivation uses simple additive weighting formula figure 4-3. Figure 4-3 shows that the line across the coast yellow
arrows, describes the existence of S3 marine suitability classes where are parallel with the mainland. This line is generated by spatial interpolation, which will
connect the sample points yellow circle one to another of the same classes. So in fact, the line with S3 classes should not exist. The S3 classes should appear
around the sample point.
4.4 Marine Coastal Suitability using Fuzzy Method
