This is a specialization of the Surface class and it inherits all attributes and associations of that class.

Name	Data Type	Definition
elevation	ValDistanceVerticalType	The vertical distance of the surface level measured from Mean Sea Level (MSL).
geoidUndulation	ValDistanceSignedType	The distance of the geoid above (positive) or below (negative) the mathematical reference ellipsoid at the location of the surface.
verticalDatum	CodeVerticalDatumType	The set of reference points or a mathematical model of the Earth's surface (a datum) against which vertical position measurements are made as basis for measuring elevations.
verticalAccuracy	ValDistanceType	The difference between the recorded elevation of a feature and its true elevation referenced to the same vertical datum expressed as a linear error at 95 percent probability.
horizontalAccuracy	ValDistanceType	The difference between the recorded horizontal coordinates of a feature and its true position referenced to the same geodetic datum expressed as a circular error at 95 percent probability.	Inherited from Surface

Association	Multiplicity	Role	To	Role description
hasAnnotations	0..*	annotation	Note		Inherited from Surface

From	Association	Multiplicity	Role	To	Role description
RunwayElement	hasExtent	0..1	extent	Extent of the runway element.
ArrestingGearExtent	isPolygon	0..1	surfaceExtent	ArrestingGearExtent is a surface.
RunwayBlastPad	hasExtent	0..1	extent	Extent of the blast pad.
TaxiwayElement	hasExtent	0..1	extent	Extent of the Taxiway Element.
DeicingArea	hasExtent	0..1	extent	Extentof the deicing area.
ApronElement	hasExtent	0..1	extent	Extent of the Apron Element.
Road	hasExtent	0..1	surfaceExtent	Extent of the road.
PassengerLoadingBridge	hasExtent	0..1	extent	Extent of the passenger loading bridge.
AircraftStand	hasExtent	0..1	extent	Extent of the gatestand.
TouchDownLiftOff	hasExtent	0..1	extent	Extent of the TouchDownLiftOff zone.
MarkingExtent	hasPolygonExtent	0..1	surfaceExtent	Marking described by the surface.
SurfaceContaminationLayer	hasExtent	0..*	extent	Contamination extent.
FloatingDockSite	hasExtent	0..1	extent	Docksite extent.
SeaplaneLandingArea	hasExtent	0..1	extent	Extent of the SeaplaneLandingArea
SeaplaneRampSite	hasExtent	0..1	extent	Ramp site extent.
NonMovementArea	hasExtent	0..1	extent	The surface extent of the non-movement area.
AirportHeliportProtectionArea	hasExtent	0..1	extent	Extent of the protection area.
WorkArea	hasExtent	0..1	extent	The extent of the WorkArea.
AirportHeliport	hasBoundaryForAviationPurposes	0..1	aviationBoundary	Boundary of the airport/heliport used for aviation operations.
AirportHotSpot	hasShape	0..1	area	The shape of the hot spot.
VerticalStructurePartGeometry	hasSurfaceShape	0..1	surfaceExtent	The extent of the vertical structure part.
AirspaceVolume	hasBoundary	0..1	horizontalProjection	The surface defining the horizontal shape of the AirspaceVolume.	Inherited from Surface
ObstacleAssessmentArea	hasExtent	0..1	surface	The geographical representation of the Assessment Area.	Inherited from Surface
RadioFrequencyArea	isDefinedBy	0..*	extent	The graphical area described for the RadioFrequencyArea.	Inherited from Surface
PointReference	hasFixError	0..1	fixToleranceArea	The dimensions of the fix tolerance area are determined by the system use accuracy of the navigation aid(s) on which the fix is based, and the distance from the facility.	Inherited from Surface
ObstacleArea	hasExtent	0..1	surfaceExtent	Extent of the obstacle area.	Inherited from Surface
CirclingArea	isIllustratedBy	0..1	extent	The geographic depiction of the circling area	Inherited from Surface
CirclingRestriction	isDepictedBy	0..1	restrictionArea	The geographical depiction of the Circling restriction.	Inherited from Surface
TerminalArrivalArea	projects	0..1	buffer	The graphical area describing the buffer defined around a Terminal Arrival Area.	Inherited from Surface
TerminalArrivalAreaSector	shows	0..1	extent	The graphical area described for the Terminal Arrival sector.	Inherited from Surface
NavigationAreaSector	isPortrayedBy	0..1	extent	The surface extent of the navigation area sector.	Inherited from Surface
SafeAltitudeAreaSector	isPortrayedBy	0..1	extent	The graphical area described for the Safe Area sector.	Inherited from Surface
AerialRefuellingAnchor	hasExtent	0..1	extent	The Surface extent of the AerialRefuellingAnchor.	Inherited from Surface

1 - AirportHeliport , 1 - Apron , 1 - Geometry , 1 - Runway , 1 - Seaplanes , 1 - Surface Contamination , 1 - Surface Marking , 1 - TLOF , 1 - Taxiway , 1 - Vertical Structures , 2 - AirportHeliport Associations , 2 - Runway Direction , 2 - TLOF Protection Area , 3 - Roads , 4 - Passenger Loading Bridge , 4 - Runway Protection , 6 - Runway Blast Pad