Topcon mmGPS 3D Paver, Reference Manual, Page: 103 / 288

GPS Localization
P/N 7010-0781
3-33
Figure 3-28. Measure Points A and B to Determine Mainfall
6. Press the
Crossfall Grade
entry box and enter a crossfall
(Figure 3-29).
The crossfall grade is the grade that falls across at a 90° angle to
the line of Mainfall (see Figure 3-26 on page 3-31), and together
with the Mainfall, determines the plane with the compound slope.
A positive (+) sign designates a fall from right to left, and a
negative (-) sign designates a fall from left to right.
Figure 3-29. Enter Crossfall Grade
View Measured Mainfall
Direction and Grade
5a
5b
Enter Grade
at 90° angle
of mainfall