Topcon mmGPS 3D Paver, Reference Manual, Page: 101 / 288

GPS Localization
P/N 7010-0781
3-31
relative information to fulfill the four factors. This information is
composed of three points: A, B, and an elevation reference point.
Figure 3-26 illustrates the basic factors needed for a sloping plane
surface model.
The following is the most common method using three reference
points prepared at the site: two points (A and B) are measured to
determine a Mainfall orientation, and the other point (elevation
reference point) is measured to determine an elevation.
Figure 3-26. Sloping Plane Surface Diagram
3DMC accurately measures the point directly below the sensor, but
does not compensate for a slant error of the sensor mast. Therefore,
for a more accurate measurement, keep the mast as vertical as
possible when measuring the point.
1. Press
Topcon Logo File Surfaces Working
or
Reference
and press
New
. Enter and select the following information for the
new surface file. Press
Next
(Figure 3-27 on page 3-32).
• Configuration name – enter a name for the file.
• Surface type – select sloping plane surface (compound
slope).
Existing Ground
Elevation Ref erence Point Elevation Reference Point Elevation Reference Point
Mainfall
Orientation
Crossfall Crossfall
Orientation Orientation
Crossfall
Orientation
Existing Ground
Sur face Plane Surface Pla
ne
Surface Plane
Sur
face Plane
Sur
face
Pla
ne
Sur
face Plane
Mainfall Grade Mainfall Gr ade Mainfall Grade
Crossfall Grade Crossfall Gr ade Crossfall Grade
B
A
B
A
0%
0%