7. • 6205 Swath Bathymetry and Dual Frequency Side Scan System
– Wide Swath Coverage up to 10 x depth
– Co-registered simultaneous bathymetric point data and dual frequency side
scan imagery
– Chirp pulses for higher accuracy and extended range
– Multipath and Wake Suppression
– Total field of view is over 200 degrees with full coverage at Nadir
– Lightweight and modular package
6205 Combined Bathymetry & Dual SS6205 Combined Bathymetry & Dual SS
8. CARIS HIPS Workflow for BathymetryCARIS HIPS Workflow for Bathymetry
Create Vessel File
Create a New HIPS Project
Convert Raw Data Files
Open Project &
Background Data
Load Attitude and
Navigation Data
Correct for Sound Velocity
Load Tide Information
Merge All Data
Define New Field Sheet
Create a Calibration
(BASE) Surface
Check Auxiliary Sensors
Find Patch Test Values
Reapply Sound Velocity
Create and Apply Filters
Update Vessel File
Remerge All Data
Finalize Surface
Export Final Product
Perform Further Cleaning
the Editors
10. Vessel FileVessel File
SVP1 = SVP2 = Same Installation Offsets as Transducer 1 and 2. Do not input Roll,
Pitch, or Yaw corrections.
Same as (1) but…
11. Converting Raw Data FilesConverting Raw Data Files
Conversion Wizard
> Step 1: EdgeTech JSF
> Step 2: Select Raw Data Files
> Step 3: Designate Project, Vessel & Day
> Step 4: Choose Navigation Coordinate System
> Step 5: Define Project Area
> Step 6: Specify Import Options for Both Bathymetry and Side Scan
Side Scan, yes?
Frequency?
From Where?
Bathymetry, yes?
12. Converting Raw Data FilesConverting Raw Data Files
Conversion Wizard
> Step 6: Specify Import Options for Both Bathymetry and Side Scan
Transducer 1 Transducer 2
13. Converting Raw Data FilesConverting Raw Data Files
Conversion Wizard
> Step 6: Specify Import Options for Both Bathymetry and Side Scan
Horizontal Binning
Angle Binning
19. Cleaning with the Aid of SS ImageryCleaning with the Aid of SS Imagery
Spikes
Fish
Fishes
Shadows
20. CARIS SIPS Workflow for Side Scan ImageryCARIS SIPS Workflow for Side Scan Imagery
Open Project and
Background Data
Clean Auxiliary Data
Compute Towfish
Navigation
Beam Pattern Predictions
Preview Image Corrections
with Side Scan Editor
Create New Field Sheet
Generate Mosaic
Create Vessel File
Open 3D Display Window
Drape Mosaic Over Final
Surface
Generate Geo-referenced
TIFF Image
22. 3D Rendering of Both Data Sets3D Rendering of Both Data Sets
23. • Traditionally a hydrographic survey would require two systems to acquire
both independent data sets.
• Caris HIPS/SIPS provides reduced processing time and a simple workflow
for large combined data sets.
– Eliminates workflow in precisely co-registering the bathymetric point data
with the side scan imagery (i.e. no rubber-stitching).
• Additional side scan imagery can be inspected simultaneous to that of the
bathymetry thereby ensuring valid bathymetry is not accidentally
removed from the data set.
Conclusion
MBES deployment methods include a rigid mount to the survey vessel and are paired with inertial measuring devices and positioning equipment in order to meet the strict IHO standards.
Where as seafloor imagery is obtained by deploying a towed side scan sonar systems. The towed method is used to get the sonar in close proximity to the seafloor to acquire high resolution imagery, but this deployment method results in poor positioning due to the assumptions made during the layback calculations.
MBES:
Offer a motion compensated data set with highly accurate positioning.
Provide poor seafloor imagery with no shadow information (a.k.a. backscatter)
Require tight multiple survey lines
SSS:
Offer a data set with imagery only with no motion compensation or accurate positioning
Provide high resolution seafloor imagery
Require large radius turn procedures to maintain altitude
Shallow water those maneuvers are pretty much impossible to make.
Rendering together is a pain.
One solution:
Rigidly attach SSS to the vessel as done with MBES systems.
Addresses positioning but yields poor resolution due to high altitudes
Is still not motion compensated and
also has a gap which increases with altitude.
A more plausible solution:
PDBS system provides both pieces of information and are already co-registered since it is the same sensor that obtains both data sets. Same reference point, etc.
One such system that provides these benefits is the 6205 Bathymetric and Dual Frequency Side Scan Sonar.
Most of the processing steps resemble that of standard MBES data except a few gotchyas: These are (1) vessel file, (2) importer (version), (3) patch test method, and (4) applying SVC. I’ll also go over recommended cleaning operations using the available editors.
