A STUDY ON THE LOWEST ASTRONOMICAL TIDE VERTICAL DATUM FOR SEA BOUNDARY DELIMITATION IN INDONESIA
Based on the United Nations Convention on the Law of the Sea III Article 47, Indonesia as a coastal and archipelagic state is obliged to submit a copy of the information on the delimitation of sea boundaries in the form of a map with an adequate scale or a list of geographical coordinates. Indonesia...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/68269 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Based on the United Nations Convention on the Law of the Sea III Article 47, Indonesia as a coastal and archipelagic state is obliged to submit a copy of the information on the delimitation of sea boundaries in the form of a map with an adequate scale or a list of geographical coordinates. Indonesia has submitted this information through Government Regulation No. 38 of 2002 concerning the List of Geographical Coordinates of the Indonesian Archipelagic Baseline Points and its amendments to Government Regulation No. 37 of 2008. The regulation states that Mean Low Water Springs (MLWS) is used as a vertical datum for the purpose of delimitation sea boundaries. Meanwhile, the International Hydrographic Organization has recommended the use of the Lowest Astronomical Tide (LAT) since 1996. Thus, problems arise regarding which type of vertical datum is the most suitable and optimal for use in Indonesia.
In determining the LAT, harmonic analysis is carried out based on tidal data for tidal stations for a year managed by the Geospatial Information Agency. Harmonic analysis to determine the number of tidal components is carried out by applying the least squares method using the T_TIDE package. The tidal component constant obtained is used for prediction for 19 years. The distance between the lowest value along the predicted sea level with the local reference Mean Sea Level is determined as the Z0 LAT. This value is compared with the Z0 MLWS generated from the Indonesian Navy Hydrography and Oceanography Center calculation to determine the vertical position relative to each other.
The resoffrom this study is information on the position of LAT against MLWS from comparisons in several locations according to tidal stations. This study shows that the vertical datum position of LAT is 68.8% below the MLWS of a total of 32 tidal stations compared. This study is expected to be material for serious consideration regarding the recommendation to use LAT replacing MLWS as a vertical datum for an optimal delimitation of Indonesia's sea boundaries.
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