Spectra-precision FAST Survey Reference Manual Manuel d'utilisateur Page 176

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Light Bar Settings
: This button allows you to specify parameters for enabling the light bar, setting the grading
tolerance, and specifying the COM port. The two light bars currently supported are Mikrofyn and Apache. FAST
Survey can actually drive the grading process, as shown below, where an Apache light bar is used on a motor
grader. In effect, this offers extremely low cost "grade indicate" machine control.
Pressing
OK
from the main
Elevation Difference
dialog will first prompt the user to load the surface files involved
(unless elevation method was selected). Then, when
OK
is pressed again, the ELEV DIFF screen in the following
figure will appear. This screen provides the user with a plan view of the project. When a shot is taken, cut or fill from
the current vertical location to the design surface is reported in the lower left portion of the screen. The computed
design surface elevation for your current location is also reported.
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