vdatum.noaa.gov

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Transform a hydrographic survey's ellipsoidal heights into a local tidal datum (e.g., Mean Lower Low Water) for a waterfront boundary determination.
5 steps · 2 gotchas · unrated
Transform vertical datum values (e.g., NAVD88 to MLLW) at a coastal survey point using the NOAA VDatum web API
5 steps · 3 gotchas · unrated
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