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The selected local geodetic
datum is a geopotential surface separated from the global geoid by a bias.
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In this context, LMSL on the
opposite side of the island would be higher than the local geodetic datum.
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Implication is that a storm
surge from that side would run up higher on land than the orthometric heights
might imply.
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LMSL is very well defined at
tide stations but shoreline observations are necessary to fill in along other
shorelines.
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Also, lidar observations are
necessary to develop a more complete model of MDT (thereby deriving LMSL)
over the transition from near shore to deeper offshore.
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You would get similar
problems if a datum point is established on one island and used for all of
them.
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