Geophysical Survey Systems, Inc.
SIR® 4000
Manual
MN72-433 Rev F
51
4
To return to the Collect Setup screen if AutoSave is set to On, push and hold down the red Stop
button for two seconds. The current file will automatically be saved and you will return to the Collect
Setup screen. If AutoSave is set to Off, press the red Stop button one time. A system prompt will pop
up giving you the option to save or discard the current file. Once an option has been selected push
and hold down the red Stop button for two seconds and you will return to the Collect Setup screen.
3.2: Setup for Single Line 3D Collection in Expert Mode
Follow these instructions if you want to build a 3D area out of multiple individual survey profiles.
You will save each profile as a different file and create the 3D project in RADAN’s 3D Module. This
method does not use the Quick3D mode on the SIR 4000. For instructions on how to use the control unit
to aid in 3D data collection see Chapter 4: Using Quick3D Mode.
Step 1 – Distance Mode Setup
Follow all the above steps for 2D Distance Mode setup in order to set your SIR 4000 to local conditions
and antenna choice. The following setup options are also recommended for single line 3D collection.
Position:
Set Position to Manual under the Radar Menu. This will ensure that you do not accidentally
auto-position over different ground surface conditions while collecting, which makes it impossible to
compare depth or time between multiple profiles.
Gain:
After you have set the gains so that you are not clipping, set Gain under the Process Menu to
Manual. This will prevent auto-gain over a different area while collecting, which would produce a
‘checkerboard’ pattern. Gain differences will mask features and create edge-effects.
Select Datapath:
GSSIs recommend creating separate datapaths when collecting a bi-directional
3D grid. Create new folders for files collected in the X-direction and for files in the Y-direction.
AutoSave:
Set AutoSave to Off. This will pause the system between profiles allowing you to reposition
the antenna to start the next profile.
Step 2 – Grid Setup
Arrange your survey grid so that you can cross your targets with at least three profiles; this will allow you
to tell the difference between a point target and a linear target. For example, if you are looking for graves
2 meters in length your survey profiles should be spaced no more than 0.5 m apart. Try to orient your
survey grid so that you cross the graves perpendicular to their long axis in order to have the greatest
possibility of hitting them. If you have targets moving in multiple directions then you should plan to
survey the grid twice; 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 30 m by 30 m 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, or zig-zig (i.e., 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.
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