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Bottom Object Type (BOB)

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

RDF: bob.ttl

Name

bottomObjectType

Datatype

Enumeration

Definition

The type of an object protruding above the water body bottom.

Description

For example, as specified by the U.S. Non-Submarine Contact List. Bottom objects may include rocks (for example: pinnacles), underwater constructions (for example: wellheads and other equipment in oil and gas fields), wrecks, and other man-made debris (for example: lost ground tackle or dumped materials). The object may, depending on conditions, float and/or be partially exposed above the water surface.

Accepted

2013-10-18

Defined by

DFDD

Values

• BOB_1 Anchor
• BOB_2 Buoy
• BOB_3 Cable
• BOB_4 Caisson
• BOB_5 Crane
• BOB_6 Dry Dock
• BOB_7 Pilings

Used by

• BD003 Large Bottom Object
• BD002 Small Bottom Object

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