Spectra Precision FAST Survey User Manual

Page 52

English

4. With the point selected in the list, tap on the

On/Off button

to tell FAST Survey how the point should be used in the
localization process.

You can force the local grid to pass through its horizontal
position by checking the

Horizontal Control button and/or

its vertical position by checking the

Vertical Control button.

Clearing the two options means the point is not involved
at all in the localization process. Tap on the green button
to validate your choices.

5. Resume the previous three steps until all your reference

points have been added to the list.

As you add new points, check the amount of residual for
each reference point involved in the localization (residuals
are displayed in the lower part of the screen). The lower
these values, the better the consistency of your set of
reference points.

Should some residuals be abnormally high, the relevant
point(s) should be deleted using the

Delete button, or its

contribution to the localization process changed by
editing its control settings through the

On/Off button.

If you enter only two reference points, the

2 pt Rotate Only

button is made available. This option allows you to use the
second point for direction but not for scaling.

6. Tap

when you are satisfied with the level of residuals.

FAST Survey then asks you to save your list of points as a
LOC or DAT localization file.

7. Name the file and tap

. The localization process is

now complete and active. This means every new point you
will now survey will be expressed on the local grid.

If points have been surveyed in the job prior to the
localization process, FAST Survey will prompt you to
convert their coordinates to the new local grid. If you
accept, FAST Survey will open the Process Raw File
window.

Simply tap

to re-process the coordinates of these

points. FAST Survey will return the list of converted
coordinates.

NOTE: Tapping

from the Localization screen is

mandatory to activate the new localization file. Using the
Save button saves the localization file but does not make
it active.