Geophysical Survey Systems, Inc.
SIR® 4000
Manual
MN72-433 Rev F
114
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
to another interval halfway through. 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:
This 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.
Note
:
These numbers are coordinates, not line length. For example, if you have a 20×20 grid and
your grid origin is X0 Y0: the upper left corner is X0 Y20, and the upper right corner is X20 Y20.
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