Setting up the Machine and 3DMC
mmGPS 3D Paver Reference Manual
3-20
The following steps help to ensure a high-quality localization suitable
for centimeter-level machine paving with mmGPS 3D Paver.
• First, the surveyor’s local Control Points must be precisely
measured. The quality of measurements directly affects paving
accuracy.
• Second, the Control Points need to be located more or less evenly
around the site. Generally, the more Control Points the better, but
if they are clustered together or are all at one section of the site,
then the results are less than ideal.
Locate Control Points evenly distributed around a perimeter of
the site or paving area. While not directly related to the quality of
localization, locate Control Points that are elevated, easily
accessible, and not obstructed by trees, buildings, other
structures, moving vehicles, and so forth.
• Third, GPS localization requires a minimum of three Control
Points, but at least four or more points should be used for the
localization.
GPS localization is processed in the control point file created prior to
beginning each project. This control point file contains the formula
necessary for the mathematical conversion between global GPS
coordinates and NEZ coordinates. A control point file can be
localized using one of the following methods:
• Measuring each control point with a Topcon GPS+ or GPS RTK
Survey Rover System and Pocket-3D. Then entering this
information into 3DMC.
See “Localizing with Pocket-3D” on page 2-24 for this
procedure.
• Entering global GPS coordinates directly into 3DMC.
See “Entering Localized GPS Coordinates” on page 3-21 below
for this procedure.
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