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Geodetic Datum of Indonesian Maritime Boundaries: Status and Problems

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Indonesia has maritime boundaries with 10 countries namely: Australia, Timor Leste, Papua New Guinea (PNG), Palau, Philippines, Vietnam, Thailand, Malaysia, Singapore, and India. Many treaties have been ratified concerning these boundaries. Unfortunately, many coordinates of boundary points mentioned in the treaties are not clear in relation to their geodetic datum. The uncertainty in geodetic datum of boundary points introduces complications and problems in spatial management of Indonesia's maritime boundaries, since it can displace the boundary lines from their assumed true location. This study investigates the possible original geodetic datums for the maritime boundaries between Indonesia and neighboring countries, in the case they are not explicitly stated in the treaties. The displacements of boundaries in WGS84 datum are generally in the order of a few hundred meters, i.e., about 200 to 400 m, depending on the assumed original geodetic datum being considered. These boundary displacements are spatially advantageous for Indonesia in some cases and also disadvantageous in others. The study will sum up with some conclusions and recommendations.
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Keywords: Indonesia; WGS84; boundary; datum; geodetic; maritime

Document Type: Research Article

Affiliations: 1: Department of Geodetic Engineering, Institute of Technology Bandung, J1, Bandung, Indonesia 2: Centre of Regional Boundary Mapping, National Coordinating Agency for Survey and Mapping (BAKOSURTANAL), Cibinong, Bogor, Indonesia

Publication date: October 1, 2005

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