TransCAD

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TransCAD

• Linear Referencing Systems

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Linear Referencing Systems

• Data on transportation and utility networks are
  often stored without geographic coordinates.
  Instead, these data sets store location
  information using a measurement from a fixed
  reference point along a route. The term linear
  referencing system is used to describe this
  method of storing location information.

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Milepost

• Information about highway, railroad, transit, and
  utility networks is often stored in tables that
  do not contain longitude and latitude
  information. Each record in the table is
  associated with a particular location, indicated
  by a route identifier and a distance from a fixed
  point on the route. The distance from the fixed
  point is known as the milepost value, or simply
  the milepost.

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Using Linear Referenced Data

• TransCAD lets you work with a milepost table as
  though it were a layer in a map. When you do so,
  TransCAD reads each record in the table, converts
  the milepost values to longitude and latitude
  coordinates, and tehn draws the feature on the
  map. The conversion is performed using
  information from a route system layer. This
  capability is sometimes known as dynamic
  segmentation.

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To Show Milepost Values
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To See the Milepost of any Point on a Route
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To Modify the Milepost of a Calibration Point
To Clear Calibration Point Modifications