Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 108)

User’s Manual – Conventional Mode
98
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.