GSSI SIR 4000, Manual

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Geophysical Survey Systems, Inc. SIR® 4000
Manual
MN72-433 Rev F 109
possibility of hitting them. If you have targets moving in multiple directions then you should plan to
survey the grid twice (bidirectional or “zig-zag”); once in the X-direction and once in the Y-direction.
Your grid length should be evenly divisible by your line spacing. For example, for a 30m by 30m grid
your lines in either the X- or Y-directions can be 0.5 m, 1 m, or 2 m apart, but they cannot be 4 m apart.
Additionally, line spacing should not change during a gridded survey unless you begin collection on
another grid.
Step 3 – Take Notes
In order for your data to be properly positioned in RADAN, you must be able to tell the software your
survey grid origin, line direction, and line orientation. You may begin your survey in any corner of the
grid and survey either in one direction (unidirectional), or zig-zig (i.e., bidirectional or back and forth). Be
sure to keep accurate notes showing the location of each file in relation to other files and immovable
objects. You will assemble the 3D project in RADAN with the 3D Module after downloading the data to
a PC. If an obstacle requires reversing the direction of a profile, such as a tree close to your baseline,
make sure to note which profile was reversed. You can adjust the start and end positions of this line in
RADAN.
Step 4 – Data Collection
Collect each survey profile as a separate file.
1
Position the center of the antenna on the baseline of your grid. The antenna has black lines on it that
mark the center. If there are no black lines, use the blue control plug as the center of the antenna. For
4-wheel carts there are lines on the black frame of the cart marking the center.
2
To begin data collection, press the green Start button one time.
3
At the end of each profile, press the red Stop button one time. Move the antenna to the next position
on the grid, and then press the Green start button one time. Repeat steps 1-3 until finished with the
first direction of the grid.
4
At the end of your last profile in each direction, push and hold down the red Stop button to stop data
collection and return to the Collect Setup screen. Saved profiles can be viewed in Playback mode.
5
If collecting a bi-directional 3D grid, create a new datapath for the new grid axis and then repeat steps
1-5 in the new direction.
6
See the RADAN user manual for guidance on combining your profiles into a 3D grid.