Last Updated：2025/12/20
Sentence
In
a
strict
sense,
a
tidal
datum
can
be
understood
as
the
reference
plane
(or
surface)
to
which
the
height
of
a
predicted
tide
is
referred.[…]Sounding
and
chart
datums
are
low
water
datums,
that
is,
they
refer
to
the
level
of
the
water
surface
at
low
tide.
Nonetheless,
there
are
also
datums
based
on
high
water
levels.[…]These
two
different
datums
may
be
included
in
the
broader
category
of
vertical
datums,
which
comprises
any
plane
or
surface
used
as
a
reference
to
measure
vertical
distances
(such
as
depths,
drying
features,
heights
on
shore,
etc.).
Quizzes for review
In a strict sense, a tidal datum can be understood as the reference plane (or surface) to which the height of a predicted tide is referred.[…]Sounding and chart datums are low water datums, that is, they refer to the level of the water surface at low tide. Nonetheless, there are also datums based on high water levels.[…]These two different datums may be included in the broader category of vertical datums, which comprises any plane or surface used as a reference to measure vertical distances (such as depths, drying features, heights on shore, etc.).
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