Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 178)

User’s Manual – Conventional Mode
168
the more shots will be taken, resulting in a more detailed surface, but
while taking more time to complete.
d. Enter the desired horizontal distance between each
shot of the surface being scanned in the Horizontal
Distance Interval field.
e. Enter the desired vertical distance between each shot
of the surface being scanned in the Vertical Distance
Interval field.
Distance Grid Advantage and Disadvantages
The advantage of using the Distance Grid method is it is more
intuitive to set up the spacing between shots (distance interval) since
the distance interval can be measured on the surface being scanned
and irrelevant of how far the total station is from the surface.
The disadvantage of the Distance Grid method is it must be possible
for the total station to measure distances to the three required shots
that define the surface perimeter. The curvature or shape of some
surfaces would make measuring distances to all these points
impossible.
Angle Grid
The Angle Grid method requires angle
measurements to be taken at two opposing
corners of the surface to be scanned. (It is not
required to shoot distances to these points.)
There are three ways to define the two corner
points, but most users will choose to shoot the
points with a total station as described below.
The first of the other two method is to enter
the horizontal and zenith angles by hand in
their respective HA and ZA fields. The third
method is to toggle the HA/ZA button for the
respective corner to Point where an existing point can be selected.
a. Aim the total station in the upper-left corner of the
surface to be scanned and tap Shoot 1.
b. Aim the total station in the lower-right corner of the
surface to be scanned and tap Shoot 2.