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Attributes
Diagrams
Facets
Properties
Source
Used by
Complex Type gml:GeodesicStringType
Namespace http://www.opengis.net/gml
Annotations
A GeodesicString consists of sequence of geodesic segments. The type essentially combines a sequence of Geodesic into a single object. The GeodesicString is computed from two or more positions and an interpolation using geodesics defined from the geoid (or ellipsoid) of the co-ordinate reference system being used.
Diagram
Diagram index59.tmp#id583 index59.tmp#id584 index59.tmp#id585 index59.tmp#id582 index73.tmp#id629 index64.tmp#id179 index61.tmp#id70 index62.tmp#id175 index74.tmp#id418
Type extension of gml:AbstractCurveSegmentType
Type hierarchy
Used by
Element gml:GeodesicString
Complex Type gml:GeodesicType
Model gml:posList | gml:pos | gml:pointProperty
Children gml:pointProperty, gml:pos, gml:posList
Attributes
QName Type Fixed Default Use Annotation
interpolation gml:CurveInterpolationType geodesic 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 GeodesicString the interpolation is fixed as "geodesic".
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="GeodesicStringType">
  <annotation>
    <documentation>A GeodesicString consists of sequence of geodesic segments. The type essentially combines a sequence of Geodesic into a single object. The GeodesicString is computed from two or more positions and an interpolation using geodesics defined from the geoid (or ellipsoid) of the co-ordinate reference system being used.</documentation>
  </annotation>
  <complexContent>
    <extension base="gml:AbstractCurveSegmentType">
      <choice>
        <element ref="gml:posList"/>
        <group ref="gml:geometricPositionGroup" minOccurs="2" maxOccurs="unbounded"/>
      </choice>
      <attribute name="interpolation" type="gml:CurveInterpolationType" fixed="geodesic">
        <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 GeodesicString the interpolation is fixed as "geodesic".</documentation>
        </annotation>
      </attribute>
    </extension>
  </complexContent>
</complexType>
Schema location http://schemas.opengis.net/gml/3.1.1/base/geometryPrimitives.xsd
Attribute gml:GeodesicStringType / @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 GeodesicString the interpolation is fixed as "geodesic".
Type gml:CurveInterpolationType
Properties
fixed: geodesic
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
Complex Type gml:GeodesicStringType
Source
<attribute name="interpolation" type="gml:CurveInterpolationType" fixed="geodesic">
  <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 GeodesicString the interpolation is fixed as "geodesic".</documentation>
  </annotation>
</attribute>
Schema location http://schemas.opengis.net/gml/3.1.1/base/geometryPrimitives.xsd