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Small Bottom Object (BD002)

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

RDF: bd002.ttl

Name

SmallBottomObject

Kind

FeatureType

Definition

An object protruding above the water body bottom whose greatest dimension is less than five metres.

Description

The object may, depending on conditions, float and/or be partially exposed above the water surface. In general such objects appear as 'mine-like' contacts on sonar sensors and will be further investigated in situations where the presence of explosive mines is suspected.

Accepted

2013-10-18

Geometry

point, multipoint, curve, multicurve, surface, multisurface, solid, multisolid

Subtype of

ZI028 Feature Entity

Attributes

BOB Bottom Object Type — multiplicity 0..1; datatype SmallBottomObject_bottomObjectTypeMeta; values: BOB_1 Anchor, BOB_2 Buoy, BOB_3 Cable, BOB_7 Pilings
SBS Contact Status — multiplicity 0..1; datatype SmallBottomObject_contactStatusMeta; values: SBS_1 Mine-like Echo (MILEC), SBS_2 Mine-like Contact (MILCO), SBS_3 Non Mine-Like Contact (NON-MILCO), SBS_4 Non-Mine, Mine-Like Bottom Object (NOMBO), SBS_5 Identified Explosive Mine, SBS_6 Unexploded Ordnance (UXO)
DTN Dangerous to Navigation — multiplicity 0..1; datatype BooleanMeta
FDD First Detection Date and Time — multiplicity 0..1; datatype CharacterStringMeta
LDD Last Detection Date and Time — multiplicity 0..1; datatype CharacterStringMeta
NCP Non-submarine Contact Position Accuracy — multiplicity 0..1; datatype MeasureIntervalMeta
RAG Non-submarine Contact Reporting Agency Type — multiplicity 0..1; datatype SmallBottomObject_nonSubContactReportAgTypeMeta; values: RAG_1 Survivor Report, RAG_10 Chart Records, RAG_11 Coast Guard Records, RAG_12 Notice to Mariners, RAG_13 North Sea Fishing Charts, RAG_14 Chart, RAG_15 Minesweeper, RAG_16 Survey, RAG_17 Position Accurate Field Check, RAG_18 Sonar Report, RAG_19 MAD Report, RAG_2 Salvage Report, RAG_20 Undifferentiated Sonar or MAD Report, RAG_3 Casualty Report, RAG_4 Action Report, RAG_5 Photograph Report, RAG_6 US Coast & Geodetic Survey/National Ocean Service Report, RAG_7 US Naval Headquarters/Commands Report, RAG_8 Hydrographic/Admiralty Office, RAG_9 Wreck List
OEC Object Existence Certainty Category — multiplicity 0..1; datatype SmallBottomObject_objectExistCertaintyCatMeta; values: OEC_1 Low, OEC_2 Medium, OEC_3 High
OCT Observation Count — multiplicity 0..1; datatype IntegerMeta
STN Stationary — multiplicity 0..1; datatype BooleanMeta
MCC Structural Material Type — multiplicity 0..*; datatype SmallBottomObject_structMatTypeMeta; values: MCC_107 Steel, MCC_117 Wood, MCC_120 Glass Reinforced Plastic (GRP), MCC_156 Ferrocement, MCC_21 Concrete, MCC_51 Iron, MCC_64 Metal
NSO Submarine-like Object — multiplicity 0..1; datatype BooleanMeta

Associations

SmallBottomObjectHydroVertPosInfo → ZI025 Hydrographic Vertical Positioning Information (0..1)

RWOI terms naming it

RWO_01683 Identified Explosive Mine
RWO_02197 MILCO
RWO_02198 MILEC
RWO_02239 Mine-like Contact
RWO_02240 Mine-like Echo
RWO_02406 NOMBO
RWO_02407 Non Mine-Like Contact
RWO_02412 NON-MILCO
RWO_02413 Non-Mine, Mine-Like Bottom Object
RWO_03445 Small Bottom Object
RWO_03947 Unexploded Ordnance
RWO_03973 UXO