Geophysical Survey Systems, Inc.
SIR® 4000
Manual
MN72-433 Rev F
103
previous data will be cleared and a new file opened. New files will be collected with the same
collection parameters as the previous file.
6
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.
6.3: Setting Up for Time Mode Data Collection in Digital 2D
The scan spacing (horizontal resolution) of Time-based data profiles is a function of the speed that the
system is collecting data (Scans/Second) and the rate the antenna is moving over the survey surface. Data
density is improved with higher Scans/Second and slower antenna speed.
Time-based data has no real distance tag, so the software does not know how far you actually traveled. It
is extremely important to move the antenna at a constant speed and to add user marks (by clicking the
mark button) at consistent intervals. Time-based data requires additional processing in RADAN to create
a 3D image. Note: If 3D imaging is your goal, it is ideal to collect Distance-based data with a survey
wheel.
Most SIR-4000 system parameters are identical in Distance Mode and Time Mode. Listed below are the
settings that pertain to Time Mode. For all other settings, refer to Distance Mode Data Collection in
Digital 2D (see above).
Radar Menu
1
Collect Mode:
Set to Time.
2
Scans/Second:
Your data density depends on the rate you move the antenna over the survey surface.
Typically this value is set much lower than the maximum.
3
Units/Mark:
You can also set how many units (feet or meters) will be collected between system
marks.
Data Collection in Time Mode
1
To begin data collection, press the green Start button one time. The SIR 4000 will instantly begin
collecting scans at the rate specified during setup. Scans will fill the screen from left to right.
2
If adding user marks during collection to correct distance in RADAN, press the Mark button at the
appropriate interval.
•
For example, if collecting single lines to build a 3D grid in RADAN, add a user mark when the
antenna crosses the baselines to indicate the beginning and end of each line.
3
At the end of your profile, press the red Stop button one time or press and hold the green Start button.
This halts the collection of the current data file; you now won’t be able to scroll across the profile or
perform any of the functions on the command bar.
4
If AutoSave is set to On the file will automatically be saved and a new file will immediately begin
using the same collection parameters as the previous file.
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