The objectives of this study is to determine an accurate method for a data collection process and propose a methodology for determining the boundary limit based on the fishery law in order to prevent disputes between fishermen of adjacent fishing blocks. To develop the optimum procedure for the boundary limit, field tests were carried out and accurate data collected at a site in KYUNGNAM province. It is an extremely difficult process to determine the boundary limits by the accurate positional depth for an official from the local government.
This is due to the lack of knowledge of the tide, datum level and positioning mechanism. The basic concepts of the tide, datum level and positioning method must first be understood before accurate positional depth and set to work procedures for fishery licensing can be developed. For basic understanding of accurate positional depth, the author briefs the concepts of the Differential Global Positioning System (DGPS) positioning by each different application method, tidal measurement steps, abbreviation of tide and positioning, the mechanism of the tide generating force by astronomical forces and comparing the other positioning methods by the different referencing Geodetic system.
The result of the experiment in this study on the island in KYUNGNAM province was the determination of large differences between the lawful areas and existing licensed areas. This was determined to be 480% larger than the lawful existing areas, which will be unacceptable to the adjacent fishermen. After analysis of the results, the cause of these large differences was found to be due to the precise hydrographic survey of the real depth for the boundary limit was not followed to the accurate positional depth. The real depth in the licensed block was determined to be three times deeper than the lawful one.
The reason was due to the lack of knowledge of the tidal height, datum level, positioning concepts, application methodology and the projection theory for each different sphere and ellipsoid, such as WGS84 vs. BESSEL1841. The author proposes seven steps to issue the licensed fishing block for the local fishery union by the local government official.