land:Alignment

geometric horizontal alignment, PGL or chain typically representing a road design center line

Element information

Content

• Choice [1..*]
  • land:Start [0..1]    Represents a 2D or 3D Starting or beginning PointDefined by either a coordinate text value ("north east" or "north east elev") or a CgPoint number reference "pntRef" attribute.
  • land:CoordGeom    A sequential list of Line and/or Curve and/or Spiral elements.After the sequential list of elements an optional vertical geometry may be defined as a profile, which may be as simple as a list of PVIs (point to point 3D line string).
  • land:AlignPIs [0..1]    A sequential list of Alignment PI Definitions
  • land:Cant [0..1]    The "Cant" element will typically represent a proposed railway cant / superelevation alignment.It is defined by a sequential series of any combination of the cant stations and speed-only stations. The “name”, “desc” and “state” attributes are typical LandXML “alignment” attributes. The “equilibriumConstant” is a unitless optional double that is used as the equilibrium constant in the cant equilibrium equation (cant = constant * speed * speed / radius). The “appliedCantConstant” is a unitless optional double that is used as the applied cant constant in the cant equilibrium equation (cant = constant * speed * speed / radius). The “gauge” is a required double that is the rail to rail distance. This value is expressed in meters or feet depending upon the units. The “rotationPoint” is an optional string that defines the rotation point. Valid values are “insideRail”, “outsideRail”, “center”, “leftRail” and “rightRail”.
  • land:StaEquation [0..*]    The "staInternal" value identifies the location of the station equation. It is the station value with no equations applied (staStart + dist). "staAhead" is the new station value and "staIncrement" indicates whether or not the station values increase or decrease.
  • land:Profile [0..*]    A profile or long section
  • land:CrossSects [0..1]    
  • land:Superelevation [0..*]    
  • land:Feature [0..*]    Used to include additional information that is not explicitly defined by the LandXML schema, Feature may contain one or more Property, DocFileRef or nested Feature elements. NOTE: to allow any valid content, the explicit definitions for Property, DocFileRef and Feature have been commented out, but are still expected in common use.Each Property element defines one piece of data.

Attributes

Used in

• Anonymous type of element land:Alignments

Sample instance

<land:Alignment name="string" length="1.0" staStart="1.0">
   <land:Start>Any text, intermingled with:1.0 1.0</land:Start>
</land:Alignment>