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Feature Type 403
Information Type 35
Attribute Type 853
Complex Type 143
Enumeration Value 2617
Codelist Value 459
Feature Association 1
Information Association 0
Role 23
Unit of Measure 271
[Attribute] Dictionary Details
Domain IHO Hydro
Name Vertical Datum
CamelCase verticalDatum
Item Identifier 1408
Definition The reference level used for expressing the vertical measurements of points on the earth's surface. Also called datum level, reference plane, levelling datum, datum for sounding reduction, datum for heights.
Data type enumeration
Related Listed Value
Code number Enumerated value Name Code number Enumerated value Name
1 Mean Low Water Springs 2 Mean Lower Low Water Springs
3 Mean Sea Level 4 Lowest Low Water
5 Mean Low Water 6 Lowest Low Water Springs
7 Approximate Mean Low Water Springs 8 Indian Spring Low Water
9 Low Water Springs 10 Approximate Lowest Astronomical Tide
11 Nearly Lowest Low Water 12 Mean Lower Low Water
13 Low Water 14 Approximate Mean Low Water
15 Approximate Mean Lower Low Water 16 Mean High Water
17 Mean High Water Springs 18 High Water
19 Approximate Mean Sea Level 20 High Water Springs
21 Mean Higher High Water 22 Equinoctial Spring Low Water
23 Lowest Astronomical Tide 24 Local Datum
25 International Great Lakes Datum 1985 26 Mean Water Level
27 Lower Low Water Large Tide 28 Higher High Water Large Tide
29 Nearly Highest High Water 30 Highest Astronomical Tide
31 Local Low Water Reference Level 32 Local High Water Reference Level
33 Local Mean Water Reference Level 34 Equivalent Height of Water (German GlW)
35 Highest Shipping Height of Water (German HSW) 36 Reference Low Water Level According to Danube Commission
37 Highest Shipping Height of Water According to Danube Commission 38 Dutch River Low Water Reference Level (OLR)
39 Russian Project Water Level 40 Russian Normal Backwater Level
41 Ohio River Datum 43 Dutch High Water Reference Level
44 Baltic Sea Chart Datum 2000 45 Dutch Estuary Low Water Reference Level (OLW)
46 International Great Lakes Datum 2020 47 Sea Floor
48 Sea Surface 49 Hydrographic Zero
50 National Low Water Datum
Reference https://portal.iho.int/iho-ohi/S32/engView.php?quick_filter=datum%3A+vertical+control&quick_filter_operator=Equals
Reference Source Hydrographic Dictionary, Part I Volume I, English
Similarity to Source Restyled : The specification includes information about its context that is not explicit in the specification in the external source.
Remarks
INT1
S4
Management Details
Proposal Type Supersession Submitting Org IHO Secretariat
Successor -- Date Proposed 2026-05-19
Predecessor Vertical Datum Date Accepted 2026-05-19
Proposed Change Add new enumerate values 50 for attribute verticalDatum..
Justification Required for S-101 Edition 2.1.0.