Geometric primitive::GM

: Public <<type>> Class

Created:	10/04/2008 12:16:12
Modified:	09/04/2014 09:50:48

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UUID:	{3CC5A3E8-2ECA-4e42-B09C-935BD5D3B64A}
Appears In:	Fig 05: Geometry basic classes , Fig 14: Direct Position , Context Diagram: GM_PointRef, Fig 26: Composite, Fig 27: Composite Point View, Context Diagram: GM_CompositePoint, Fig 08: GM_Primitive, Fig 09: GM_Point, Fig 07: Geometry Boundary Data Types, Context Diagram: GM_Point, Context Diagram: GM_CurveBoundary, Geometry Root, Context Diagram: MD_Georectified, Context Diagram: MI_ImageDescription, Context Diagram: CV_PointValuePair, Main, Fig 16 - CV_Grid, Context Diagram: CV_GridPoint, Fig 14 Template App Schema for Point Set Coverage, Context Diagram: LR_ReferenceMarker, Main, Context Diagram: EG_PointEstimate, MF_RigidTemporalGeometry, Figure 11: Sampling Manifold, Context diagram: SF_SamplingPoint

GM_Point (Figure 9) is the basic data type for a geometric object consisting of one and only one point.

Attributes
Operations
Associations To
Associations From
Tagged Values
Other Links

Attribute

Public DirectPosition
position

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Alias:
Initial:
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Ordered:
Range:

Notes:

The attribute "position" shall be the DirectPosition of this GM_Point. GM_Point::position [1] : DirectPosition NOTE In most cases, the state of a GM_Point is fully determined by its position attribute. The only exception to this is if the GM_Point has been subclassed to provide additional non-geometric information such as symbology.

Operation

Public
bearing(

toPoint: GM_Position,

Default:
Kind:	inout
Stereotype:

):Bearing

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Sequential

Notes:

Returns the vector bearing of the second point with respect to the first. So. P1.Bearing(P2) is a unit vector based at P1 pointing towards P2. The operation "bearing" shall return the bearing of the tangent (at this GM_Point) to the curve between this GM_Point and a passed DirectPosition. GM_Point::bearing(point : DirectPosition) : Vector The choice of the curve type for defining the bearing is dependent on the CRS in which this GM_Point is defined. For example, in Mercator Projections in its most common usage, the curve is the rhumb line. In a 3D, geocentric coordinate system, the curve may be the geodesic joining the two points along the surface of the geoid in use. Implementation supporting this function shall specify the nature of the curve to be used.

Public
boundary():NULL

Details:

Sequential

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The operation "GM_Point::boundary" is a specialization of the boundary operation at GM_Object, and shall return an empty set. GM_Point::boundary() : NULL

Public
GM_Point(

position: GM_Position,

Default:
Kind:	inout
Stereotype:

):GM_Point

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Sequential

Element	Source Role	Target Role
«type» GM_CompositePoint Class	Name: generator	Name: composite
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Element	Source Role	Target Role
«type» CV_GridPoint Class	Name: gridPoint	Name: groundPoint
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«FeatureType» SF_SamplingPoint Class	Name:	Name: shape
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«type» GM_CurveBoundary Class	Name:	Name: startPoint
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«type» GM_CurveBoundary Class	Name:	Name: endPoint
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GM_PointRef Class	Name:	Name: point
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Tag	Value
persistence	persistent
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Object	Type	Connection	Direction	Notes
«type» EG_PointEstimate	Class	Generalization	From
«type» GM_Primitive	Class	Generalization	To
«type» GM_CompositePoint	Class	Generalization	From