gml:ArcByCenterPoint

This variant of the arc requires that the points on the arc shall be computed instead of storing the coordinates directly. The single control point is the center point of the arc plus the radius and the bearing at start and end. This representation can be used only in 2D.
The element radius specifies the radius of the arc.
The element startAngle specifies the bearing of the arc at the start.
The element endAngle specifies the bearing of the arc at the end.
The interpolation is fixed as "circularArcCenterPointWithRadius".
Since this type describes always a single arc, the attribute "numArc" is fixed to "1".
The content model follows the general pattern for the encoding of curve segments.

Element information

Namespace: http://www.opengis.net/gml/3.2

Schema document: external/ogc/gml/3.2.1/geometryPrimitives.xsd

Type: gml:ArcByCenterPointType

Properties: Global, Qualified

Content

Choice [1..1]
- gml:pos
- gml:pointPropertyThis property element either references a point via the XLink-attributes or contains the point element. pointProperty is the predefined property which may be used by GML Application Schemas whenever a GML feature has a property with a value that is substitutable for Point.
- gml:pointRep
- gml:posList
- gml:coordinates
gml:radius [1..1]
gml:startAngle [0..1]
gml:endAngle [0..1]

Attributes

Name	Occ	Type	Notes
numDerivativesAtStart	[0..1]	xsd:integer	Default value is "0". from type gml:AbstractCurveSegmentType
numDerivativesAtEnd	[0..1]	xsd:integer	Default value is "0". from type gml:AbstractCurveSegmentType
numDerivativeInterior	[0..1]	xsd:integer	Default value is "0". from type gml:AbstractCurveSegmentType
interpolation	[0..1]	gml:CurveInterpolationType	Fixed value is "circularArcCenterPointWithRadius".
numArc	[1..1]	xsd:integer	Fixed value is "1".

Used in

Type gml:ArrayAssociationType (Element gml:members)
Type gml:CurveSegmentArrayPropertyType (Element gml:segments)

Substitution hierarchy

gml:AbstractObject
- can be substituted with gml:AbstractCurveSegment
  - can be substituted with gml:ArcByCenterPoint
    - can be substituted with gml:CircleByCenterPoint

Sample instance

<gml:ArcByCenterPoint numArc="1">
   <gml:pos>1.0 1.0</gml:pos>
   <gml:radius uom="">1.0</gml:radius>
   <gml:startAngle uom="">1.0</gml:startAngle>
   <gml:endAngle uom="">1.0</gml:endAngle>
</gml:ArcByCenterPoint>