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

Name	Data Type	Definition
horizontalAccuracy	ValDistanceType	The difference between the recorded horizontal coordinates of a surface and its true position referenced to the same geodetic datum expressed as a circular error at 95 percent probability.

Association	Multiplicity	Role	To	Role description
			GeoBorder
			SignificantPoint
hasAnnotations	0..*	annotation	Note
Segmentation	1..*	patch	GM_SurfacePatch		Inherited from GM_Surface

From	Association	Multiplicity	Role	To	Role description
AerialRefuellingAnchor	hasExtent	0..1	extent	The Surface extent of the AerialRefuellingAnchor.
AirspaceVolume	hasBoundary	0..1	horizontalProjection	The surface defining the horizontal shape of the AirspaceVolume.
RadioFrequencyArea	isDefinedBy	0..*	extent	The graphical area described for the RadioFrequencyArea.
SafeAltitudeAreaSector	isPortrayedBy	0..1	extent	The graphical area described for the Safe Area sector.
ObstacleArea	hasExtent	0..1	surfaceExtent	Extent of the obstacle area.
CirclingRestriction	isDepictedBy	0..1	restrictionArea	The geographical depiction of the Circling restriction.
PointReference	hasFixError	0..1	fixToleranceArea
ObstacleAssessmentArea	hasExtent	0..1	surface	The geographical representation of the Assessment Area.
CirclingArea	isIllustratedBy	0..1	extent	The geographic depiction of the circling area
TerminalArrivalAreaSector	shows	0..1	extent	The graphical area described for the Terminal Arrival sector.
TerminalArrivalArea	projects	0..1	buffer	The graphical area describing the buffer defined around a Terminal Arrival Area.
NavigationAreaSector	isPortrayedBy	0..1	extent	The surface extent of the navigation area sector.
GM_Surface	Segmentation	1..*	patch		Inherited from GM_SurfacePatch

This class is specialized into: ElevatedSurface

1 - Aerial Refuelling , 1 - Airspace Feature , 1 - Circling , 1 - Geometry , 1 - Obstacle Assessment Feature , 1 - Radio Frequency Limitation , 1 - Segment Points , 1 - Terminal Arrival Area , 1- Minimum and Emergency Safe Altitude , 2 - Communication Channel , 2 - NavigationArea , 2 - Point Reference , 2 - Restricted Navigation , 3 - Navaid Limitation , 3 - Obstacle Areas