index - LineStringSegmentType

complexType LineStringSegmentType

http://www.opengis.net/gml

extension of gml:AbstractCurveSegmentType

base	gml:AbstractCurveSegmentType

gml:pos gml:pointProperty gml:pointRep gml:posList gml:coordinates

LineStringSegment

numDerivativesAtStart

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.

numDerivativesAtEnd

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.

numDerivativeInterior

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.

gml:CurveInterpolationType

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 a LineStringSegment the interpolation is fixed as "linear".

A LineStringSegment is a curve segment that is defined by two or more coordinate tuples, with linear interpolation between them.
Note: LineStringSegment implements GM_LineString of ISO 19107.

<xs:complexType name="LineStringSegmentType">
<xs:annotation>
    <xs:documentation>A LineStringSegment is a curve segment that is defined by two or more coordinate tuples, with linear interpolation between them.
Note: LineStringSegment implements GM_LineString of ISO 19107.</xs:documentation>
</xs:annotation>
<xs:complexContent>
    <xs:extension base="gml:AbstractCurveSegmentType">
      <xs:sequence>
        <xs:choice>
          <xs:annotation>
            <xs:documentation>GML supports two different ways to specify the control points of a curve segment.
1. A sequence of "pos" (DirectPositionType) or "pointProperty" (PointPropertyType) elements. "pos" elements are control points that are only part of this curve segment, "pointProperty" elements contain 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 allows for a compact way to specifiy the coordinates of the control points, if all control points are in the same coordinate reference systems and belong to this curve segment only. The number of direct positions in the list must be at least two.</xs:documentation>
          </xs:annotation>
          <xs:choice minOccurs="2" maxOccurs="unbounded">
            <xs:element ref="gml:pos"/>
            <xs:element ref="gml:pointProperty"/>
            <xs:element ref="gml:pointRep">
              <xs:annotation>
                <xs:documentation>Deprecated with GML version 3.1.0. Use "pointProperty" instead. Included for backwards compatibility with GML 3.0.0.</xs:documentation>
              </xs:annotation>
            </xs:element>
          </xs:choice>
          <xs:element ref="gml:posList"/>
          <xs:element ref="gml:coordinates">
            <xs:annotation>
              <xs:documentation>Deprecated with GML version 3.1.0. Use "posList" instead.</xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:choice>
      </xs:sequence>
      <xs:attribute name="interpolation" type="gml:CurveInterpolationType" fixed="linear">
        <xs:annotation>
          <xs: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 a LineStringSegment the interpolation is fixed as "linear".</xs:documentation>
        </xs:annotation>
      </xs:attribute>
    </xs:extension>
</xs:complexContent>
</xs:complexType>

attribute LineStringSegmentType/@interpolation

gml:CurveInterpolationType

isRef	0
fixed	linear

Kind	Value	annotation
enumeration	linear
enumeration	geodesic
enumeration	circularArc3Points
enumeration	circularArc2PointWithBulge
enumeration	circularArcCenterPointWithRadius
enumeration	elliptical
enumeration	clothoid
enumeration	conic
enumeration	polynomialSpline
enumeration	cubicSpline
enumeration	rationalSpline

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 a LineStringSegment the interpolation is fixed as "linear".

<xs:attribute name="interpolation" type="gml:CurveInterpolationType" fixed="linear">
<xs:annotation>
<xs: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 a LineStringSegment the interpolation is fixed as "linear".</xs:documentation>
</xs:annotation>
</xs:attribute>

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