Determination of the Coastline

Posted on Jul 8, 2007 By : Unknown

Due to the tide and wave, there are (at least) 4 kinds of coastlines:
  • Mean Sea Level - MSL, used in topo-map.
  • Lowest Astronomical Tide – LAT, used in navigational chart.
  • Highest Astronomical Tide – HAT, used to define an island. This is also a “security line” to protect the coastal area against tidal-flood.
  • Actual Apparent Coastline - AAC, this is the visible coastline on aeral photographs / satellite images, which separated land from water. This line is between LAT and HAT.

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