gml:Circle

A Circle is an arc whose ends coincide to form a simple closed loop. The three control points shall be distinct non-co-linear points for the circle to be unambiguously defined. The arc is simply extended past the third control point until the first control point is encountered.

Element information

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

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

Type: gml:CircleType

Properties: Global, Qualified

Content

from type gml:ArcType

Choice [1..1]

Choice [3..3]
- 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

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 "circularArc3Points". from type gml:ArcStringType
numArc	[0..1]	xsd:integer	Fixed value is "1". from type gml:ArcType

Used in

Type geo:ArcType (Element geo:Arc)
Type geo:CircleType (Element geo:Circle)
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:ArcString
    - can be substituted with gml:Arc
      - can be substituted with gml:Circle

Sample instance

<gml:Circle numArc="1">
   <gml:pos>1.0 1.0</gml:pos>
</gml:Circle>