You are here: Popular Formats > XML (Extensible Markup Language) Reader/Writer > xfMap > Feature Mapping Rules > xml-clothoid

xml-clothoid

This is a non-composite/composite builder that constructs a clothoid geometry. The following clothoid definition is supported:

builder type: non-composite/composite, accepts point geometries in composite mode

geometry constructed: clothoid geometry

data parameters:

Data Name

Value

Required/
Optional

data-string

The coordinate data string denotes the start, and (optionally) end and intersection points.

The coordinate data may be received as point geometries. These points can be named or unnamed.

The named point geometries can also be received in any order: their names must be one of “start, end”, or “pi”.

If the point geometries are unnamed, then the order of the points is significant: the first point received is assumed as the start point, the next point as the end point, and the last point as the point of intersection. Use the “point-order” data parameter to change this.

Notes: 

  • The names are case-insensitive.
  • “poi” may be substituted for “pi”.

Optional if the points are to be passed in as point geometries; otherwise Required
point-order

Specifies which order points should be received in when they are unnamed.

Range: start-end-pi | start-pi-end

Default: start-end-pi

Optional
start-curvature / start-radius

The curvature at the start of the clothoid must be specified as either a curvature (start-curvature) or a radius (start-radius).

Range: A positive real number.

Default: There are no default values.

Required
end-curvature / end-radius

The curvature at the end of the clothoid must be specified as either a curvature (end-curvature) or a radius (end-radius).

Required
length

The length of the clothoid.

Required
start-angle

The angle that aligns with the start-tangent of the clothoid.

Optional, if POI is specified, otherwise required
start-angle_uom

Specifies whether the start angle is in degrees or radians.

Range: deg | degree | rad | radians

Default: deg

Optional

direction

Specifies the traversal direction from the start to the end point of the elliptical arc.

Range: cw | ccw

Default: There are no default values

Optional

axis-order

Indicates the axis for a coordinate.

Range: A permutation of the numbers 1..N, where N is the number of dimensions.

Each number is separated by a comma “,”.

Default: “1,2,...,N”

Optional; used only if data-string is specified

axis-separator

The string separating each axis of a coordinate in the data-string.

Range: String | “whitespace” – this includes the tab, newline, and space characters.

Default: “,”

Optional; used only if data-string is specified

coord-separator

The string separating each coordinate in the data-string.

Range: String

Default: “whitespace” – this includes the tab, newline, and space characters.

Optional; used only if data-string is specified

allow-mixed-dimensions

This allows the datastring to process coordinates with differing dimensions.

Range: true, false

Default: false

Optional; used only if data-string is specified

decimal

The string representing the decimal point for each real number in the data-string.

Range: String

Default: “.”

 Optional; used only if data-string is specified

coordinate-system

Specifies the coordinate system name.

If the expression sequence for the coordinate-system evaluates to the empty string, then the coordinate system for the feature being built will not be set.

Range: String

Optional

demote-incomplete-geometry

This optional data parameter allows the xml-clothoid geometry builder to return a non-geometrical object when no data-string is given or when the value of the data-string is the empty string.

Range: false | true

Default: false

Optional

incomplete-geometry-traits

This optional data parameter takes effect only when the demote-incomplete-geometry data parameter is set to true. This parameter lists the xml-elliptical-arc data parameters that should be loaded into the demoted arc geometry as traits.

For example, when this geometry builder fails to construct an arc and demote-incomplete-geometry is set to true and the value for this parameter is set to “radius direction”, then the builder will construct a null geometry with radius and direction traits.

Range: whitespace-separated list of arc data parameter names

Default: There are no default values.

Optional

name

Specifies the geometry’s name.

Range: String

Optional