CADD Engineering Standards - Ohio Department of Transportation

303.2.4 Referencing Models
January 18, 2013
When selecting a reference to attach, users must select the appropriate model, Design or Sheet, in a
design file. A Design or Sheet model can be attached as a reference to the currently active model in the
open design file or in other design files. See Section 303.3 Basemap Design Files and Section 303.4
Sheet Design Files.
303.3 Basemap Design Files
Basemap design files are used to draw existing and proposed plan view information for the entire length
of the project for both Roadway and Bridge projects. All basemap information shall be drawn in the
default Design model. The location and dimensions of all plan view basemap design file information shall
be drawn using real world dimensions at a 1:1 scale.
For Roadway projects, the three most common Basemap design files are as follows::
• One containing the existing information (typically from ground survey or Aerial mapping).
• A second containing the proposed roadway information.
• A third containing the proposed Right-of-Way information. Existing Right-of-Way information may
be in the same file with the proposed Right-of-Way information, or in the same file with the
existing ground survey.
Plan view information may be separated into multiple discipline-specific basemap design files as listed
below:
Allowable Plan View Basemap Files
Aerial mapping
Bridge
Drainage
Environmental
Existing Ground Survey
Geotechnical
Landscaping
Lighting
Maintenance of Traffic
Proposed Roadway
Right-of-Way
Signals
Traffic Control
Utilities
Walls
ODOT CADD Engineering Standards 69