Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 120)

User’s Manual – Conventional Mode
110
Set Up the Job
1. If your reference layer is defined by a DXF or DTM file, it must
first be loaded into the data collector.
2. From the Main Menu, tap Stakeout , Stake DTM to
open the Stake DTM screen.
3. In the DTM Source field, select if your DTM reference
surface will be defined by a Layer or File and
then select the layer or tap the power button, then
Browse and select the appropriate DTM or DXF file.
Warning: If importing a DXF or DTM file where the
distance units in the source file are different than the
distance units for the current job, the imported
coordinates will be converted to the current job’s distance
units when they are imported. This is normally the
desired result, but it can cause a problem if the distance
units for the imported data or the current job were set
incorrectly. This situation can most commonly occur when working
with International Feet and US Survey Feet, where the conversion
from one to the other is not always obvious.
Usually the difference between International Feet and US Survey
Feet is negligible (2 parts per million), but when dealing with State
Plane or UTM mapping plane coordinates, which are often very large
in magnitude, the difference can be substantial if the coordinates are
converted from one format to the other.
If importing coordinates from a source where you are not sure if the
units are in International Feet or US Survey Feet into a job that is
set to International Feet or US Survey Feet, you will usually just
want to import them without any conversion being performed. To do
this, be sure to select the same distance units for the source file as
those set for the current job.