Transcript Document 7618085

TransCAD
Linear Referencing Systems
2016/5/25
1
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.
2016/5/25
2
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.
2016/5/25
3
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.
2016/5/25
4
To Show Milepost Values
2016/5/25
5
To See the Milepost of any Point
on a Route
2016/5/25
6
To Modify the Milepost of a
Calibration Point
To Clear Calibration Point
Modifications
2016/5/25
7