TransCAD

1. TransCAD Linear Referencing Systems

2. 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.

3. 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.

4. 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.

5. To Show Milepost Values

6. To See the Milepost of any Point on a Route

7. To Modify the Milepost of a Calibration Point To Clear Calibration Point Modifications