Geophysical Survey Systems, Inc.
SIR® 4000
Manual
MN72-433 Rev F
61
4.3: Setting Up Quick3D Collection
Quick3D mode on the SIR 4000 has the
same menus as Expert Mode described
in Chapter 2, plus an additional menu to
setup the size and collection parameters
for a 3D grid.
Grid Menu
X/Y Start Value:
These two items tell
the system the coordinate of your origin
point. Typically these will both be zero
(0). If you are working on a pre-existing
site grid and you want your survey grid
origin to have that coordinate, you may
add it here.
X/Y End Value:
The SIR 4000 uses this
coordinate to figure out the size of your
grid. In the example menu, the numbers for both the X and Y are 10. This means that the X axis and the
Y axis both end at 10, and since the origin is at (0,0) the grid is 10×10.
X/Y Line Spacing:
This is the spacing between your
survey lines. X lines are parallel to the X axis and
Y lines are parallel to the Y axis. The X spacing can
be different from the Y spacing, but the spacing must
be regular. For example, you cannot start your grid at
one interval and change halfway through to another.
If you need to change the line spacing, you must start
a new grid with the new parameters.
Survey Directions (X, Y, or both):
3D surveys are
typically collected along both the X and Y grid axes.
If you only want to collect on the X or the Y, you
must also change the parameters for the unused grid
direction. GSSI recommends changing the values of
the unused axis to the overall grid dimensions.
X/Y Line Order:
Controls the survey line direction.
•
Forward:
Profiles are surveyed in one
direction from the starting baseline to the
ending baseline. At the end of each profile,
you must move the antenna back to the
starting baseline before moving to the next
line and collecting in the same direction.
•
Zigzag:
Allows you to collect data in both
directions. At the end of a line, turn the system around and begin data collection in the opposite
direction.
•
Reverse:
Profiles are surveyed in one direction from the ending baseline to the starting baseline.
At the end of each profile, you must move the antenna back to the ending baseline before moving
to the next line and collecting in the same direction.
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