Notes
:
•
General speaking, if a three- or seven-parameter datum transformation has been
configured for the project, users can skip the site calibration and the coordinates
measured will be transformed automatically into local grid coordinates.
•
If a projection and datum transformation have already been specified, users can
reduce any discrepancies between the WGS-84 coordinates and the local grid
coordinates by performing a site calibration.
•
To perform the site calibration, users need to measure the control points with GNSS
receiver first.
To perform site calibration:
(1)
In the main menu, tap
Survey
→ tap
Site CAL
.
(2)
Tap
Add
at the lower left corner to add point pair(s).
(3)
In the pop-up screen, tap icon located at the same row with
Name
at the first row
of
GNSS Point
section to add the existing GNSS point or key in a GNSS point.
(4)
Tap icon located at the same row with
Name
at the first row of
Known Point
section to add the existing known point or key in a known point.
(5)
Choose the method of calibration at the bottom of the screen and click
OK
to finish
the chosen for this pair.
Notes
:
Users can determine whether this point pair is involved in the computation of
either horizontal or vertical adjustment or both.
(6)
Continue the
Step 2
to
Step 5
to add all the point pairs.
(7)
After entering all the existing pairs, go back to
Site Calibration
screen, choose an
appropriate
Height Fitting Method
and click
Calculate
button.
Notes
:
The height fitting methods are “Surface Fitting”, “Best Practice” (by default) and
“Fixed difference” respectively. For best results, make sure that the control points
are evenly distributed to the extent of the job area.
(8)
Click
Application
the prompt is “Whether replace the current project parameters
or not”, choose
Yes
and apply the result to the whole project.
Notes
:
Users can log to view plane correction and vertical fitting parameters. Otherwise,
those are invisible. The default login values of display function are “admin” for
Name
and “123456” for
Password
.
