Presentation to State DOT, VicRoads

1. DIGITAL MODELS FOR
CONSTRUCTION
Richard Tabe (PB)

2. DIGITAL DATA FOR CONSTRUCTION
 HISTORY
 BENEFITS
 GPS Machine Grading
 THE MEANS
 LAND XML
 THE MODEL
 QUESTIONS

3. HISTORY
• Lesser Projects – began in early 90’s
• 1st Major Projects Machine Grading
• Craigieburn Bypass
• EastLink
• Meeting at 101 Collins with stakeholders

4. BENEFITS
• Eliminate transference errors
• Highest most complete level of data
available
 Fills the holes left by the cross sections
 Provides x,y,z’s at all points on the design
surface
 Indicates boning lines and interval

5. BENEFITS (continued)
• Streamline Checking
• Visualisation of design
• Reduce Construction Time
• Distribution of Data to Stakeholders
• Reduce Costs

6. GPS Machine Grading
• Automated or Manual Control
• Interrogation of design live

7. THE MEANS
• CAD Files – 2D and 3D (survey manipulation
required)
• Land XML of Digital Terrain Model
 Surveyor may not use same package
 Land XML- Universal DXF

8. LAND XML
• Geometry – Horizontal and Vertical
• Digital Terrain Model- Named Features and
Triangles
• Application Add-in
• Reference – “Bentley InRoads Group of
Products- Exporting InRoads Data for
Construction”

9. LAND XML

10. LAND XML
E14 EBEN.xml
E14 EBEN GEOMETRY.xml

11. THE MODEL
• 2D Functional
• 3D Strings
• Complete – no omissions
• Verification – the same
• Reference Files – no manual editing
• Design Change – no shortcuts
“If you can’t trust the model, you can’t trust the
plans”

12. West Gate Upgrade

15. DISCUSSION
 “If you can’t trust the model, you
can’t trust the plans”
“Vision is the art of seeing what is
invisible to others”- Jonathan Swift