index - ArcStringByBulgeType

complexType ArcStringByBulgeType

http://www.opengis.net/gml

extension of gml:AbstractCurveSegmentType

base	gml:AbstractCurveSegmentType

gml:pos gml:pointProperty gml:pointRep gml:posList gml:coordinates gml:bulge gml:normal

element	ArcStringByBulge
complexType	ArcByBulgeType

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

circularArc2PointWithBulge

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 ArcStringByBulge the interpolation is fixed as "circularArc2PointWithBulge".

The number of arcs in the arc string can be explicitly stated in this attribute. The number of control points in the arc string must be numArc + 1.

This variant of the arc computes the mid points of the arcs instead of storing the coordinates directly. The control point sequence consists of the start and end points of each arc plus the bulge.

<xs:complexType name="ArcStringByBulgeType">
<xs:annotation>
    <xs:documentation>This variant of the arc computes the mid points of the arcs instead of storing the coordinates directly. The control point sequence consists of the start and end points of each arc plus the bulge.</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:element name="bulge" type="double" maxOccurs="unbounded">
          <xs:annotation>
            <xs:documentation>The bulge controls the offset of each arc's midpoint. The "bulge" is the real number multiplier for the normal that determines the offset direction of the midpoint of each arc. The length of the bulge sequence is exactly 1 less than the length of the control point array, since a bulge is needed for each pair of adjacent points in the control point array. The bulge is not given by a distance, since it is simply a multiplier for the normal.
The midpoint of the resulting arc is given by: midPoint = ((startPoint + endPoint)/2.0) + bulge*normal</xs:documentation>
          </xs:annotation>
        </xs:element>
        <xs:element name="normal" type="gml:VectorType" maxOccurs="unbounded">
          <xs:annotation>
            <xs:documentation>The attribute "normal" is a vector normal (perpendicular) to the chord of the arc, the line joining the first and last
point of the arc. In a 2D coordinate system, there are only two possible directions for the normal, and it is often given as a signed real, indicating its length, with a positive sign indicating a left turn angle from the chord line, and a negative sign indicating a right turn from the chord. In 3D, the normal determines the plane of the arc, along with the start and endPoint of the arc.
The normal is usually a unit vector, but this is not absolutely necessary. If the normal is a zero vector, the geometric object becomes equivalent to the straight line between the two end points. The length of the normal sequence is exactly the same as for the bulge sequence, 1 less than the control point sequence length.</xs:documentation>
          </xs:annotation>
        </xs:element>
      </xs:sequence>
      <xs:attribute name="interpolation" type="gml:CurveInterpolationType" fixed="circularArc2PointWithBulge">
        <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 an ArcStringByBulge the interpolation is fixed as "circularArc2PointWithBulge".</xs:documentation>
        </xs:annotation>
      </xs:attribute>
      <xs:attribute name="numArc" type="integer" use="optional">
        <xs:annotation>
          <xs:documentation>The number of arcs in the arc string can be explicitly stated in this attribute. The number of control points in the arc string must be numArc + 1.</xs:documentation>
        </xs:annotation>
      </xs:attribute>
    </xs:extension>
</xs:complexContent>
</xs:complexType>

attribute ArcStringByBulgeType/@interpolation

gml:CurveInterpolationType

isRef	0
fixed	circularArc2PointWithBulge

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 an ArcStringByBulge the interpolation is fixed as "circularArc2PointWithBulge".

<xs:attribute name="interpolation" type="gml:CurveInterpolationType" fixed="circularArc2PointWithBulge">
<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 an ArcStringByBulge the interpolation is fixed as "circularArc2PointWithBulge".</xs:documentation>
</xs:annotation>
</xs:attribute>

attribute ArcStringByBulgeType/@numArc

isRef	0
use	optional

The number of arcs in the arc string can be explicitly stated in this attribute. The number of control points in the arc string must be numArc + 1.

<xs:attribute name="numArc" type="integer" use="optional">
<xs:annotation>
<xs:documentation>The number of arcs in the arc string can be explicitly stated in this attribute. The number of control points in the arc string must be numArc + 1.</xs:documentation>
</xs:annotation>
</xs:attribute>

element ArcStringByBulgeType/bulge

http://www.opengis.net/gml

isRef	0
minOcc	1
maxOcc	unbounded
content	simple

The bulge controls the offset of each arc's midpoint. The "bulge" is the real number multiplier for the normal that determines the offset direction of the midpoint of each arc. The length of the bulge sequence is exactly 1 less than the length of the control point array, since a bulge is needed for each pair of adjacent points in the control point array. The bulge is not given by a distance, since it is simply a multiplier for the normal.
The midpoint of the resulting arc is given by: midPoint = ((startPoint + endPoint)/2.0) + bulge*normal

<xs:element name="bulge" type="double" maxOccurs="unbounded">
<xs:annotation>
<xs:documentation>The bulge controls the offset of each arc's midpoint. The "bulge" is the real number multiplier for the normal that determines the offset direction of the midpoint of each arc. The length of the bulge sequence is exactly 1 less than the length of the control point array, since a bulge is needed for each pair of adjacent points in the control point array. The bulge is not given by a distance, since it is simply a multiplier for the normal.
The midpoint of the resulting arc is given by: midPoint = ((startPoint + endPoint)/2.0) + bulge*normal</xs:documentation>
</xs:annotation>
</xs:element>

element ArcStringByBulgeType/normal

http://www.opengis.net/gml

isRef	0
minOcc	1
maxOcc	unbounded
content	complex

In general this reference points to a CRS instance of gml:CoordinateReferenceSystemType
(see coordinateReferenceSystems.xsd). For well known references it is not required that the CRS description exists at the
location the URI points to. If no srsName attribute is given, the CRS must be specified as part of the larger context this
geometry element is part of, e.g. a geometric element like point, curve, etc. It is expected that this attribute will be specified
at the direct position level only in rare cases.

xs:positiveInteger

The "srsDimension" is the length of coordinate sequence (the number of entries in the list). This dimension is
specified by the coordinate reference system. When the srsName attribute is omitted, this attribute shall be omitted.

Ordered list of labels for all the axes of this CRS. The gml:axisAbbrev value should be used for these axis
labels, after spaces and forbiddden characters are removed. When the srsName attribute is included, this attribute is optional.
When the srsName attribute is omitted, this attribute shall also be omitted.

Ordered list of unit of measure (uom) labels for all the axes of this CRS. The value of the string in the
gml:catalogSymbol should be used for this uom labels, after spaces and forbiddden characters are removed. When the
axisLabels attribute is included, this attribute shall also be included. When the axisLabels attribute is omitted, this attribute
shall also be omitted.

The attribute "normal" is a vector normal (perpendicular) to the chord of the arc, the line joining the first and last
point of the arc. In a 2D coordinate system, there are only two possible directions for the normal, and it is often given as a signed real, indicating its length, with a positive sign indicating a left turn angle from the chord line, and a negative sign indicating a right turn from the chord. In 3D, the normal determines the plane of the arc, along with the start and endPoint of the arc.
The normal is usually a unit vector, but this is not absolutely necessary. If the normal is a zero vector, the geometric object becomes equivalent to the straight line between the two end points. The length of the normal sequence is exactly the same as for the bulge sequence, 1 less than the control point sequence length.

<xs:element name="normal" type="gml:VectorType" maxOccurs="unbounded">
<xs:annotation>
<xs:documentation>The attribute "normal" is a vector normal (perpendicular) to the chord of the arc, the line joining the first and last
point of the arc. In a 2D coordinate system, there are only two possible directions for the normal, and it is often given as a signed real, indicating its length, with a positive sign indicating a left turn angle from the chord line, and a negative sign indicating a right turn from the chord. In 3D, the normal determines the plane of the arc, along with the start and endPoint of the arc.
The normal is usually a unit vector, but this is not absolutely necessary. If the normal is a zero vector, the geometric object becomes equivalent to the straight line between the two end points. The length of the normal sequence is exactly the same as for the bulge sequence, 1 less than the control point sequence length.</xs:documentation>
</xs:annotation>
</xs:element>

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