Spectra Precision Survey Pro v4.6 Ranger User Manual - Manual (Page 300)

User’s Manual – GPS Mode
290
Adjust with Projection – Results
The Adjust with Projection Results screen is
used to preview the results of the adjustment
before anything is applied to the job file. The
default view is to list the action and results only
for points that will be updated in the
adjustment. You can tap Show all points to
update the list to show the reason unchanged
points are not adjusted.
1. Review the results.
2. Tap Apply to update the job.
Projection Calculator
You can use the Projection Calculator to calculate combined scale
factor for scaling conventional distance measurements to the
mapping plane. You can also use the Projection Calculator to
calculate meridian convergence for reducing geodetic azimuths (such
as a sun shot) to grid bearings.
Scale Factor Calculator
1. Go to the Survey > Projection Calculator screen.
2. Choose a point on the mapping plane for scale computation in the
Select Point
control. Tap Solve Scale>.
3. Enter a height to compute Ellipsoid Scale Factor. This calculation
uses the height of the point above the ellipsoid to correct for the
effect of the terrain above the reference surface.
4. Tap Solve> to calculate the combined scale factor with the
selected values. The combined scale factor is displayed in the
Ground to Grid
box. The inverse combined factor is displayed in
the Grid to Ground box.
5. Tap Accept when you are done. Both numbers are saved in the
Past Results
list so you can use them in other calculations.