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Feature Type 393

Information Type 35

Attribute Type 846

Complex Type 138

Enumeration Value 2576

Codelist Value 459

Feature Association 1

Information Association 0

Role 21

Unit of Measure 271

[Listed Value] Dictionary Details

Domain

IHO Hydro

Name

Hydrographic Zero

CamelCase

hydrographicZero

Item Identifier

2919

To conform with S-100 Edition 4.0.0, this unique identifier equates to the sourceIdentifier attribute in feature Catalogues.

Definition

A vertical reference near the lowest astronomical tide (LAT), below which the sea level falls only very exceptionally.

Data type

Enumerated value

Associated Attribute

Attribute type	Name
Enumerated type	Vertical Datum

Reference

Reference Source

IHO Tides, Water Level and Currents Working Group

Similarity to Source

Unspecified : No change has been made to the specification.

Remarks

Deviation between LAT and hydrographic zero may be due to a strong anticyclonic atmospheric condition, adding weight to the water column that may exceptionally cause the lowest sea level to fall below the astronomical low water level.

INT1

Management Details

Proposal Type	Addition	Submitting Org	IHO Secretariat
Successor	--	Date Proposed	2022-04-04
Predecessor	--	Date Accepted	2022-04-04
Proposed Change	Add new enumerate value for attribute verticalDatum.
Justification	Required for S-100 Edition 5.0.0 (refer Part 17

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