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GEODETIC METHODOLOGIES (CHAPTER 3)

GEODETIC METHODOLOGIES (CHAPTER 3). Harald Brekke. Definitions. The CLCS follows the IHO (1990) standard abbreviation for a nautical mile, M The CLCS follows the IHB (1929) standard for the length of one nautical mile: 1 M = 1 852 m

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GEODETIC METHODOLOGIES (CHAPTER 3)

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  1. GEODETIC METHODOLOGIES (CHAPTER 3) Harald Brekke

  2. Definitions • The CLCS follows the IHO (1990) standard abbreviation for a nautical mile, M • The CLCS follows the IHB (1929) standard for the length of one nautical mile: • 1 M = 1 852 m • The CLCS, following article 84 of UNCLOS, requires the datum used by a coastal State to be specified

  3. Recommended datum • The CLCS recommends the use of datums ITRF94 or WGS84 (G873) as they are regarded as equivalent realisations of an International Terrestrial Reference System (ITRS) • Geodetic coordinates in one system will be regarded by the CLCS as equivalent in the other (See 3.2.13)

  4. Required information • The submitting State should provide: • Coordinates of the outer limit of the continental shelf in an ITRS adopted by the CLCS • Transformation parameters between the reference system used in the submission and an ITRS adopted by the CLCS • Full information of the scientific methodology employed to determine these transformation parameters (See 3.2.8)

  5. Baselines • The CLCS is not entitled by UNCLOS to issue any recommendations with respect to the delineation of baselines from which the breadth of the territorial sea is measured • The CLCS may request geodetic information about baselines in relation to the test of appurtenance and the employment of the 350 M maximum limit (See 3.3.1 - 2)

  6. Limits to be delineated • The outermost fixed points at each of which the thickness of sedimentary rocks is at least 1 per cent o the shortest distance from such point to the foot of the continental slope • At a distance of 60 M from the foot of the slope • At a distance of 350 M from the baselines • At a distance of 100 M from the 2,500 m isobath (See 3.4.1)

  7. Envelope of arcs • The CLCS regards the application of the method of envelopes of arcs on the surface of the geodetic reference ellipsoid in a submission as an admissible methodology to determine outer limits based on distances from the nearest points located on : • baselines • the 2,500 m isobath, and • the foot of the continental slope (See 3.4.4)

  8. Traces paralleles • The CLCS acknowledges the existence of the method of traces paralleles to determine the outer limits of maritime spaces from straight, closing and archipelagic baselines (See 3.4.6)

  9. Points to be documented • The CLCS observes that: • There is no parallelism between the cost and the limit • The outer limit is simpler than the normal baseline • Only a few points contribute to the delineation of the outer limit • Hence, only the most seaward points which effectively contribute to the delineation of the outer limit need be documented (not the full coastline, 2,500 m isobath or the continous foot of the slope line)(See 3.4.11)

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