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

Content

• Sequence [1..1]
  1. Choice [1..1]
     • gml:pos    
     • gml:pointProperty    This 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    deprecated
     • gml:posList    
     • gml:coordinates    deprecated
  2. gml:radius [1..1]    
  3. gml:startAngle [0..1]    
  4. gml:endAngle [0..1]    

Attributes

Used in

• Type geo:ArcByCenterPointType (Element geo:ArcByCenterPoint)
• 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>