Topcon mmGPS 3D Paver, Reference Manual, Page: 94 / 288

Setting up the Machine and 3DMC
mmGPS 3D Paver Reference Manual
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3DMC also has the ability to create a surface model using a unique,
onsite method. The surface model is created on the machine, in real-
time, and can be used as a design surface file for grading in 3D GPS/
mmGPS control. Unlike conventional applications using a laser
control system, using 3DMC to create a surface model eliminates the
required, repetitive setup of a transmitter at the job site.
3DMC can create the following surfaces:
• Flat plane surface – Creates a planar surface with a 0% cross
slope and mainfall. This surface is primarily used for building
pads.
• Sloping plane surface – Creates a sloping surface with cross
slopes and mainfall based on a reference elevation. In paving
applications, you can create this surface when a 3D design
surface is not available.
• Raise/lower existing surface – Raises or lowers the current
surface. This function displays the reference cut/fill value from 0
(zero) rather than the distance between current and selected
surfaces.
• Subgrade of existing road – Creates a surface with a cross slope
different from the design road surface. For most road surfaces,
the cross slopes for the finish design surface is different from the
subgrade design slopes.