Geography Reference
In-Depth Information
Linear
Referencing
STEP-BY-STEP
The first concept to grasp is that of a “route.” A route is a linear feature, probably made up of several or
many other linear features. A route has a unique identifier and has a measurement system stored with its
geometry.
Exercise 9-5 (Project)
Experimenting within Linear Features
1.
Start ArcCatalog. In the Catalog Tree find the folder
[___] IGIS-Arc\Linear_Referencing.
Copy it into ___ IGIS-Arc_
YourInitials
.
2.
In
___IGIS-Arc_
YourInitials
\Linear_Referencing
\Pittsburgh.mdb\PITT_Roads_Routes
preview the Geography of Just_Roads. Using the Identify tool, click on a few features. You
will notice that you that you get some standard information (e.g., feature name) and also a
route identifier (called ROUTE1), a beginning mile point, and an ending mile point. Look at the
attribute table of Just_Roads. How many road segments are there? ________.
3.
In the Catalog Tree, click All_Routes. Switch back to the Geography display, which thins out a
lot compared to Just_Roads. These are road features that have been combined and designated
as “routes”—all under the name of ROUTE1. Each route is composed of sets of features from
Just_Roads.
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