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Sounding Datum (VDC)

DGIF baseline 2026-1, the latest. Earlier baselines: timemap.

RDF: vdc.ttl

Name

soundingDatum

Datatype

Enumeration

Definition

The tidal datum to which soundings and drying heights are referenced.

Description

It is usually taken to correspond to a low water stage of the tide.

Synonyms

Chart Sounding Datum

Accepted

2013-10-18

Defined by

DFDD

Values

• VDC_10 Mean Higher High Water
• VDC_100 Equinoctial Spring Low Water
• VDC_101 Local Datum
• VDC_102 International Great Lakes Datum 1985
• VDC_103 Mean Water Level
• VDC_104 Lower Low Water Large Tide
• VDC_105 Higher High Water Large Tide
• VDC_107 Nearly Highest High Water
• VDC_11 Mean Low Water
• VDC_12 Mean Low Water Neaps
• VDC_13 Mean Low Water Springs
• VDC_14 Mean Lower Low Water
• VDC_15 Mean Sea Level
• VDC_16 Mean Tide Level
• VDC_17 Neap Tide
• VDC_18 Spring Tide
• VDC_19 Mean Lower Low Water Springs
• VDC_2 High Water
• VDC_20 Lowest Astronomical Tide
• VDC_21 Chart Datum (Unspecified)
• VDC_22 Highest Astronomical Tide
• VDC_24 Mean Higher High Water Springs
• VDC_28 Highest High Water
• VDC_3 Higher High Water
• VDC_30 Indian Spring High Water
• VDC_4 Indian Spring Low Water
• VDC_5 Low Water
• VDC_6 Lower Low Water
• VDC_7 Mean High Water
• VDC_8 Mean High Water Neaps
• VDC_9 Mean High Water Springs
• VDC_90 Lowest Low Water
• VDC_91 Lowest Low Water Springs
• VDC_92 Approximate Mean Low Water Springs
• VDC_93 Low Water Springs
• VDC_94 Approximate Lowest Astronomical Tide
• VDC_95 Nearly Lowest Low Water
• VDC_96 Approximate Mean Low Water
• VDC_97 Approximate Mean Lower Low Water
• VDC_98 Approximate Mean Sea Level
• VDC_99 High Water Springs

Used by

• ZI012 Sounding Metadata
• BA005 High Water Line
• BE021 Low Water Line
• BA000 Water Line

Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.