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IV. RESULTS AND DISCUSSIONS
Generally, analysis of marine coastal suitability is computing several physical parameters in a particular location, which comparison between the criteria of
classification and rule requirements should be fulfilled for a particular commodity in order to obtain maximum production. These criteria of physical parameters are
called “marine suitability” when maximum value of all physical parameter criteria is the highest value and also vice versa if the criteria of physical parameter
conditions outside of the desired value with the desired sentence is indicated as not suitable.
4.1 The Constraints of the Research
Before discussing results, there are some limitations of this works to be aware and the limitations as follows:
• Marine coastal suitability evaluation is based on bio-physical parameters. The process did not accommodate cultural and economic evaluations such as
annual income of fishermen. • The sample points in this study are considered not sufficient, so it could
influence the process of spatial interpolation. • This study did not consider the effect of seasonal change within a year, where
in rainy season, seaweed and pearl oyster cultivation are much affected.
4.2 Marine Coastal Suitability using Minimum Threshold Criteria
Based on criteria is used in third phase in figure 3-3, then the fourth phase convert to polygon is converting raster into polygon. In this phase a fragment of
database is converted into classification criteria. Data column of gridcode in fragment of database consist of 1, 2, 3, and 99 which 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.
The process of matching criteria of physical parameters is described in table 3-3. The information in this table used numbers to facilitate calculation by preparing a
28 simple computer program. Type as number 4 represents S1, number 3 as S2,
number 2 as S3 and number 1 as N. The matching process will generate the lowest classification of marine coastal suitability as described. For instance, a fragment
process matching in table 4-2 used six physical parameters in the first row temperature, salinity, pH, brightness, depth and dissolved oxygen which have
values as 4S1, 4S1, 2S3, 1 N, 1 N, 2 S3, then the result of this marine coastal suitability will be N as the lowest. The same process will be done for the
second row and so on. Limitations and completeness of data on the map need to be examined prior to be
processed to prepare the expected data, because if the data is incomplete, the result from the initial process will be different and produce invalid marine coastal
suitability. Table 4-1. Example fragment of Minimum Threshold Criteria
Spatial Analysis for Seaweed and Pearl Oyster Cultivation
Spatial polygon map of marine coastal suitability is indicated by spline interpolation, ordinary point to obtain the minimum value of the curve between
the input values. Figure 4-1 a is a result of polygon map for seaweed spatial polygon of marine coastal suitability that uses threshold criteria method. This
spatial polygon map is based on matching process physical parameters as shown in table 4-1. Figure 4-1 b is the result of polygon map for pearl oyster spatial
polygon map of marine coastal suitability using threshold criteria method, the same process is conducted for seaweed cultivation.
29 a Seaweed cultivation
b Pearl oyster cultivation Figure 4-1. Marine coastal suitability using minimum threshold criteria
This polygon map is based on matching physical parameters. Table 4-1 is a fragment of the database process, this table is the next process after weighted
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
