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A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW).
Tide tables, sometimes called tide charts, are used for tidal prediction and show the daily times and levels of high and low tides, usually for a particular location. [1] Tide heights at intermediate times (between high and low water) can be approximated by using the rule of twelfths or more accurately calculated by using a published tidal ...
Tidal range is the difference in height between high tide and low tide. Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun, by Earth's rotation and by centrifugal force caused by Earth's progression around the Earth-Moon barycenter. Tidal range depends on time and location.
The ocean currents surrounding the Philippines: (1) Mindanao Current, (2) Mindanao Undercurrent (dotted to indicate that it is deeper than the other currents shown), (3) Mindanao Eddy, (4) North Equatorial Current, (5) Kuroshio current, (6) the beginnings and feeder currents of the Kuroshio (gradated to indicate that it strengthens to the North), (7) Indonesian Throughflow, and (8) North ...
The Philippine Atmospheric, Geophysical and Astronomical Services Administration (Filipino: Pangasiwaan ng Pilipinas sa Serbisyong Atmosperiko, Heopisiko at Astronomiko, [4] abbreviated as PAGASA, which means "hope" as in the Tagalog word pag-asa) is the National Meteorological and Hydrological Services (NMHS) agency of the Philippines mandated to provide protection against natural calamities ...
The Philippines' National Mapping and Resource Information Authority (Filipino: Pambansang Pangasiwaan sa Pagmamapa at Dulugang Kaalaman), abbreviated as NAMRIA, is an agency of the Philippine government under the Department of Environment and Natural Resources responsible for providing the public with mapmaking services and acting as the central mapping agency, depository, and distribution ...
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The lunitidal interval [1] measures the time lag from lunar culmination to the next high tide at a given location. It is also called the high water interval (HWI). [2] [3] Sometimes a term is not used for the time lag, but instead the terms age or establishment of the tide are used for the entry that is in tide tables.