Spectra Precision Survey Pro v4.5 Recon and Nomad Reference Manual - Manual (Page 24)

Survey Pro Reference Manual
R-16
Import
File Import .
The Import screen is used to add the points from another source into
the current job or import the data from a LandXML file to the current
job.
Warning: Coordinate values can change when they are imported!
Importing coordinates from any source other than a JOB file requires
that the distance units used in the source file be specified. It is not
necessary to specify the distance units when importing coordinates
from a JOB file since those units are written within the file.
If importing coordinates 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 any distance units 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, such as an HP 48, 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.