Land Suitability Analysis Weighting and Scoring Land Suitability Classes

3.7.3. Fishing Activities

The land suitability for fishing activities is not specifically discussed in this research, because it can be assumed that everyone can do fishing in all parts of the coasts. Hence, it is the last alternative to be done. Table 3.8. Matrix of suitability for fishing activities Categorize and scoring No Variable Unit S1 Highly Suitable S2 Suitable S3 Marginally Suitable N Not Suitable 1. Water clearness - - - 2. Tidal wave - - - 3. Tidal Height - - - 4. Salinity Suitable for all conditions - - - Source: Sunarto, et al 1997, Kep-02MENKLHI1998, with modification

3.8. Land Suitability Analysis

Land suitability analysis in Maros including land suitability for tourism area, marine aqua culture seaweed, fishpond, keramba jaring apung, and fishing activities was done based on physical criteria. There are 4 steps GIS analysis conducted, they are 1 creating land-use classification map, 2 creating matrix of suitability for any activities that will be performed, 3 scoring and weighting, 4 spatial analysis to obtain suitable area for any activities performed. Many recommended results will be produced, but only the best recommended will be used to coastal development. Therefore, spatial multi criteria decision making SMCDM analysis will be performed to find the best alternative map. 37 Buffer and Uses Zones Physical Suitable area for Tourism Physical Suitable area for Aqua Cultivation Physical Suitable area for Fishing Activities Suitable area for Tourism Suitable area for Aqua Cultivation Suitable area for Fishing Activities Ex: Current Velocity Sechi Disk Depth Temperature Salinity Oxygen Demand PH Depth Water Suitable Area for Marine Aqua Cultivation Seaweed Buffer and Uses Zones Physical Suitable area for Tourism Physical Suitable area for Aqua Cultivation Physical Suitable area for Fishing Activities Suitable area for Tourism Suitable area for Aqua Cultivation Suitable area for Fishing Activities Ex: Current Velocity Sechi Disk Depth Temperature Salinity Oxygen Demand PH Depth Water Suitable Area for Marine Aqua Cultivation Seaweed Current Velocity Sechi Disk Depth Temperature Salinity Oxygen Demand PH Depth Water Suitable Area for Marine Aqua Cultivation Seaweed Fig 3.4. Land Suitability Processing

3.9. Weighting and Scoring Land Suitability Classes

Scoring of each theme uses weighting value. Weight for each theme is given, starting from important to less important level. Every theme is divided into several classes according research area. Finally, every class has final value multiplication of scoring and weighting factor result from themes. Determination of criteria, scoring and weighting value are based on some previous researches. Scoring and weighting value are through index overlay model approach Bonham – Carter, 1994. This model has assessment that weight is given for every layer and a score is also given for every class in one coveragelayer. Multiplication of scoring and weighting values in coverage is appropriated by importance level to determine suitable area. Mathematical Equation: …. 2 W i S x = ∑n i S ij ∑n j W i 38 Where: Sx : Weighting index from polygon selected Sij : Number of class j from map i Wi : Weighting for coverage layer i n : Number of map Index overlay value shows suitability area level, which the final result is a list of ranking of suitable area classes. Its classes are: S1 highly Suitable, S2 suitable, S3 marginally suitable, and N not suitable. Suitable area class is based on range of suitability index value. One map has all variable above, which every variable is given score 4 for S1, 3 for S2, 2 for S3 and 1 for N. Land has overlay index value among 4, 3, 2 and 1 that is considered random combinations from suitability matrix variable on overlay process, so it needs to perform site suitability analysis SQL for obtaining land suitability. After SQL analysis is done, the next step is compiling overlay result into land suitability class. The equation used is as follows: …….. 3 S max – S min S l = n Where: Sl : Land suitability class range Smax : Highest overlay index value Smin : Lowest overlay index value n : Number of class 3.10. Framework of Coastal Development Decision Making 3.10.1. Landuse Priority Analysis