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Annotations
Attributes
Diagrams
Facets
Properties
Source
Used by
Element gml:ArcByCenterPointType / gml:radius
Namespace http://www.opengis.net/gml
Annotations
The radius of the arc.
Diagram
Diagram docindex108.tmp#id251 docindex108.tmp#id250 docindex257.tmp#id390
Type gml:LengthType
Type hierarchy
Properties
content: complex
Attributes
QName Type Fixed Default Use Annotation
uom anyURI required
Source
<element name="radius" type="gml:LengthType">
  <annotation>
    <documentation>The radius of the arc.</documentation>
  </annotation>
</element>
Schema location http://schemas.opengis.net/gml/3.1.1/base/geometryPrimitives.xsd
Element gml:ArcByCenterPointType / gml:startAngle
Namespace http://www.opengis.net/gml
Annotations
The bearing of the arc at the start.
Diagram
Diagram docindex108.tmp#id251 docindex108.tmp#id250 docindex470.tmp#id301
Type gml:AngleType
Type hierarchy
Properties
content: complex
minOccurs: 0
Attributes
QName Type Fixed Default Use Annotation
uom anyURI required
Source
<element name="startAngle" type="gml:AngleType" minOccurs="0">
  <annotation>
    <documentation>The bearing of the arc at the start.</documentation>
  </annotation>
</element>
Schema location http://schemas.opengis.net/gml/3.1.1/base/geometryPrimitives.xsd
Element gml:ArcByCenterPointType / gml:endAngle
Namespace http://www.opengis.net/gml
Annotations
The bearing of the arc at the end.
Diagram
Diagram docindex108.tmp#id251 docindex108.tmp#id250 docindex470.tmp#id301
Type gml:AngleType
Type hierarchy
Properties
content: complex
minOccurs: 0
Attributes
QName Type Fixed Default Use Annotation
uom anyURI required
Source
<element name="endAngle" type="gml:AngleType" minOccurs="0">
  <annotation>
    <documentation>The bearing of the arc at the end.</documentation>
  </annotation>
</element>
Schema location http://schemas.opengis.net/gml/3.1.1/base/geometryPrimitives.xsd
Complex Type gml:ArcByCenterPointType
Namespace http://www.opengis.net/gml
Annotations
This variant of the arc requires that the points on the arc have to be computed instead of storing the coordinates directly. The control point is the center point of the arc plus the radius and the bearing at start and end. This represenation can be used only in 2D.
Diagram
Diagram docindex129.tmp#id557 docindex129.tmp#id558 docindex129.tmp#id559 docindex129.tmp#id556 docindex273.tmp#id584 docindex273.tmp#id585 docindex131.tmp#id74 docindex132.tmp#id177 docindex133.tmp#id372 docindex134.tmp#id181 docindex135.tmp#id75 docindex273.tmp#id581 docindex273.tmp#id582 docindex273.tmp#id583
Type extension of gml:AbstractCurveSegmentType
Type hierarchy
Used by
Model (gml:pos | gml:pointProperty | gml:pointRep | gml:posList | gml:coordinates) , gml:radius , gml:startAngle{0,1} , gml:endAngle{0,1}
Children gml:coordinates, gml:endAngle, gml:pointProperty, gml:pointRep, gml:pos, gml:posList, gml:radius, gml:startAngle
Attributes
QName Type Fixed Default Use Annotation
interpolation gml:CurveInterpolationType circularArcCenterPointWithRadius optional
The attribute "interpolation" specifies the curve interpolation mechanism used for this segment. This mechanism
uses the control points and control parameters to determine the position of this curve segment. For an ArcByCenterPoint the interpolation is fixed as "circularArcCenterPointWithRadius".
numArc integer 1 required
Since this type describes always a single arc, the attribute is fixed to "1".
numDerivativeInterior integer 0 optional
The attribute "numDerivativesInterior" specifies the type of continuity that is guaranteed interior to the curve. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity.
NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.
numDerivativesAtEnd integer 0 optional
The attribute "numDerivativesAtEnd" specifies the type of continuity between this curve segment and its successor. If this is the last curve segment in the curve, one of these values, as appropriate, is ignored. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity.
NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.
numDerivativesAtStart integer 0 optional
The attribute "numDerivativesAtStart" specifies the type of continuity between this curve segment and its predecessor. If this is the first curve segment in the curve, one of these values, as appropriate, is ignored. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity.
NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.
Source
<complexType name="ArcByCenterPointType">
  <annotation>
    <documentation>This variant of the arc requires that the points on the arc have to be computed instead of storing the coordinates directly. The control point is the center point of the arc plus the radius and the bearing at start and end. This represenation can be used only in 2D.</documentation>
  </annotation>
  <complexContent>
    <extension base="gml:AbstractCurveSegmentType">
      <sequence>
        <choice>
          <annotation>
            <documentation>GML supports two different ways to specify the control points of a curve segment. 1. A "pos" (DirectPositionType) or "pointProperty" (PointPropertyType) element. The "pos" element contains a center point that is only part of this curve segment, a "pointProperty" element contains a point that may be referenced from other geometry elements or reference another point defined outside of this curve segment (reuse of existing points). 2. The "posList" element can be used to specifiy the coordinates of the center point, too. The number of direct positions in the list must be one.</documentation>
          </annotation>
          <choice>
            <element ref="gml:pos"/>
            <element ref="gml:pointProperty"/>
            <element ref="gml:pointRep">
              <annotation>
                <documentation>Deprecated with GML version 3.1.0. Use "pointProperty" instead. Included for backwards compatibility with GML 3.0.0.</documentation>
              </annotation>
            </element>
          </choice>
          <element ref="gml:posList"/>
          <element ref="gml:coordinates">
            <annotation>
              <documentation>Deprecated with GML version 3.1.0. Use "posList" instead.</documentation>
            </annotation>
          </element>
        </choice>
        <element name="radius" type="gml:LengthType">
          <annotation>
            <documentation>The radius of the arc.</documentation>
          </annotation>
        </element>
        <element name="startAngle" type="gml:AngleType" minOccurs="0">
          <annotation>
            <documentation>The bearing of the arc at the start.</documentation>
          </annotation>
        </element>
        <element name="endAngle" type="gml:AngleType" minOccurs="0">
          <annotation>
            <documentation>The bearing of the arc at the end.</documentation>
          </annotation>
        </element>
      </sequence>
      <attribute name="interpolation" type="gml:CurveInterpolationType" fixed="circularArcCenterPointWithRadius">
        <annotation>
          <documentation>The attribute "interpolation" specifies the curve interpolation mechanism used for this segment. This mechanism uses the control points and control parameters to determine the position of this curve segment. For an ArcByCenterPoint the interpolation is fixed as "circularArcCenterPointWithRadius".</documentation>
        </annotation>
      </attribute>
      <attribute name="numArc" type="integer" use="required" fixed="1">
        <annotation>
          <documentation>Since this type describes always a single arc, the attribute is fixed to "1".</documentation>
        </annotation>
      </attribute>
    </extension>
  </complexContent>
</complexType>
Schema location http://schemas.opengis.net/gml/3.1.1/base/geometryPrimitives.xsd
Attribute gml:ArcByCenterPointType / @interpolation
Namespace No namespace
Annotations
The attribute "interpolation" specifies the curve interpolation mechanism used for this segment. This mechanism
uses the control points and control parameters to determine the position of this curve segment. For an ArcByCenterPoint the interpolation is fixed as "circularArcCenterPointWithRadius".
Type gml:CurveInterpolationType
Properties
fixed: circularArcCenterPointWithRadius
Facets
enumeration linear
enumeration geodesic
enumeration circularArc3Points
enumeration circularArc2PointWithBulge
enumeration circularArcCenterPointWithRadius
enumeration elliptical
enumeration clothoid
enumeration conic
enumeration polynomialSpline
enumeration cubicSpline
enumeration rationalSpline
Used by
Source
<attribute name="interpolation" type="gml:CurveInterpolationType" fixed="circularArcCenterPointWithRadius">
  <annotation>
    <documentation>The attribute "interpolation" specifies the curve interpolation mechanism used for this segment. This mechanism uses the control points and control parameters to determine the position of this curve segment. For an ArcByCenterPoint the interpolation is fixed as "circularArcCenterPointWithRadius".</documentation>
  </annotation>
</attribute>
Schema location http://schemas.opengis.net/gml/3.1.1/base/geometryPrimitives.xsd
Attribute gml:ArcByCenterPointType / @numArc
Namespace No namespace
Annotations
Since this type describes always a single arc, the attribute is fixed to "1".
Type integer
Properties
use: required
fixed: 1
Used by
Source
<attribute name="numArc" type="integer" use="required" fixed="1">
  <annotation>
    <documentation>Since this type describes always a single arc, the attribute is fixed to "1".</documentation>
  </annotation>
</attribute>
Schema location http://schemas.opengis.net/gml/3.1.1/base/geometryPrimitives.xsd