Spectra Precision Survey Pro v4.5 Recon and Nomad User Manual - Manual (Page 318)

User’s Manual – GPS Mode
308
• Tap Next> to examine the solution parameters.
• The scale is 0.9999972. This is approximately –2.2 ppm,
or less than 3mm in 1Km, and would be considered near
perfect. Solutions using actual field measurements will
usually have a scale around 15-25 ppm.
• The rotation is 1-57-47. You may or may not be able to
evaluate this answer. In this example, the ground
coordinates were created by scaling Oregon North map
projection coordinates, so the rotation is the negative of
the meridian convergence on that mapping plane zone. In
other jobs, the bearings may have arbitrary orientation,
in which case the rotation value will adjust to the local
bearings.
• The Delta values represent the shift from the TDS default
stereographic zone false northing and easting (100000.0,
100000.0) to the local system (5000.0, 5000.0).
• Tap Accept to complete the wizard. The Adjust with
Projection wizard will adjust the job with the new coordinate
system and display a preview. In this case, you will see the
new base point updated. You can tap Show all points to see
which job file points were not adjusted and why.
5. Check points.
• The Data Collection screen is open and you are ready to
collect data in your local coordinate system. However, before
you begin, it is advisable to check to an additional control
point to verify the solution. Tap Control to open the Control
Points screen.
• Enter Point 3 and tap Check. Results should be perfect in our
example. In the field you would expect check points to be
within the measurement precision of your GPS system.
• Tap Accept and review the results on the Results tab.
• Tap Close to return to the Data Collection screen.
6. Collect some points with maximum precision
• Enter a starting point number. For this example, enter b1.
Tap Point to ‘measure’ the point, the Occupy Data Point