gml:ArcByBulge

An ArcByBulge is an arc string with only one arc unit, i.e. two control points, one bulge and one normal vector.
As arc is an arc string consisting of a single arc, the attribute "numArc" is fixed to "1".

Element information

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

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

Type: gml:ArcByBulgeType

Properties: Global, Qualified

Content

Sequence [1..1]
1. Choice [1..1]
  - Choice [2..2]
    - 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
2. gml:bulge [1..1]
3. gml:normal [1..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 "circularArc2PointWithBulge". from type gml:ArcStringByBulgeType
numArc	[0..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:ArcStringByBulge
    - can be substituted with gml:ArcByBulge

Sample instance

<gml:ArcByBulge numArc="1">
   <gml:pos>1.0 1.0</gml:pos>
   <gml:bulge>1.0</gml:bulge>
   <gml:normal>1.0 1.0</gml:normal>
</gml:ArcByBulge>