6/8/2015hypack® multibeam training seminar1 data processing ‘mbmax’ multibeam editor hypack ®...
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04/18/23 HYPACK® Multibeam Training Seminar 1
DATA PROCESSING DATA PROCESSING ‘MBMAX’ ‘MBMAX’
MULTIBEAM EDITORMULTIBEAM EDITOR
HYPACK ® MULTIBEAM COURSE
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MBMAX IntroductionMBMAX Introduction
Survey’s Done, Now What?Survey’s Done, Now What?•Need to apply TideTide and Sound Velocity Sound Velocity corrections.
•Adjust offsetsAdjust offsets if necessary.
•Remove fliers Remove fliers from support sensors (GPS for example). Remove all multibeam flyers. But keep all the good points!But keep all the good points!
•SaveSave to Edited format file when done. Re-edit if needed.
That’s the simple explanation of what MBMAX does.That’s the simple explanation of what MBMAX does.
MBMAX menu, tool bar and line selector.
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New MBMAX Multicore ProcessorsNew MBMAX Multicore Processors
• Uses WINDOWS’ Memory Mapping function to load Multiple Files simultaneously using ALL available CPU Processors.
(12 Core Machines are now available)
• No more going to Lunch while the previous days survey data loads.
SORRY !
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MBMAXMBMAX
Phase 1
Check Raw Parameters
Phase 2
Swath-Based Editing
Phase 3
Area-Based Editiing
HS2
HSX
XTF
HYSWEEPSURVEY
HS2
XYZ
VEL
TID
Data Flow - MBMAXData Flow - MBMAX
GSF
Previously Edited
HYSWEEPSURVEY
Data
Other Vendor Raw Format Data
Additional Corrections
for Raw Data
Final Data Formats for Processed
DataXYZ
RAW
HYPACKSURVEY
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MBMAX - Starting UpMBMAX - Starting Up
Select FilesSelect Files•Choose individual files or Select All (up to 255).
Launch MBMAXLaunch MBMAX•Menu or icon bar.
Input File FormatsInput File Formats•HSX: Native format of HYSWEEP® Survey.
•HS2: MBMAX edit format.
•RAW: Native format of HYPACK® Survey.
•XYZ: ASCII files.
•XTF: Some XTF multibeam files can be converted for processing in MBMAX.
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MBMAX – Still Starting UpMBMAX – Still Starting UpOpen OptionsOpen Options•Process in Depth or Elevation mode.
•Auto ProcessingAuto Processing
Hands off edit and save with filtering.
Good for a ‘quick look’ or perhaps export to CUBE.
Not commonly used.
CorrectionsCorrections•Tide File: If using files from Manual Tides.
•SV File: If using files from Sound Velocity program.
Multiple SV Profiles•Enter time of each cast.
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Read ParametersRead Parameters
A Lot Going On Here…A Lot Going On Here…•Selections: Select devices. Option to load Sidescan to aid editing.
•Device Info: Change offsets if necessary.
•Survey Info: Some settings and information from the survey file.
•Presort: Simple data thinning removes 50 - 90% of sweeps.
•GPS Pre-Filter: Either Position or RTK Tides. Filters based on GPS Mode values, # of satellites, HDOP, and/or speed.
Advanced Read ParametersAdvanced Read Parameters•RTK Tides: Selections to avoid double correction.
•Correct for Induced Heave: If MRU is not at boat CG.
•Remove Heave Drift: Averaging method nullifies drift.
•Adjust SV Profile…: Replace top of profile with sensor reading at the head.
•Ray Tracing: Select Line or Arc method or let MBMAX decide based on profile depth and sampling.
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Phase 1 - Raw Data ReviewPhase 1 - Raw Data ReviewLine by Line ReviewLine by Line Review•Check that devices are working – no flat lines.
•Check for heave drift.
•Edit Position data in track lines.
(Block or Single point.)
Use mouse wheel to zoom, right click to pan.
•Edit RTK tides.
(Block or Single point)There’s editing to do!
RTK tide and position spikes and heave drift.
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Arrows step between files.
RED Line is Current Displayed File
Tide graph: White is Raw Tide
RED is processed RTK tide.
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Phase 1 - Raw Data ReviewPhase 1 - Raw Data ReviewNew SV Profile WindowNew SV Profile Window
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Data from SV CastSV entered in the Sonar and recorded in the RMB record
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Bad or NO Sound Velocity Profile
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AFTER Correct Sound Velocity Profile Applied
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Option to Load Multiple SV Profiles• Select multiple VEL files. Enter cast times.
•Limit of 48 VEL files.
• SV profile is interpolated for each ping.
(Based on ping time, not location.)
•Interpolated cast is in White.
Using an MVP:•Cast data collection is done while underway.
•Cast files (VEL format) are time tagged automatically.
SV InterpolationSV Interpolation
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SVP ExtensionSVP ExtensionGoal: A reasonable profile beyond the reach of an ocean cast.
•Based on a model of Temperature, Pressure and Salinity.
•Salinity is relatively constant.
•Decreasing SV to 1000 meters (decreasing temperature).
•Increasing SV below 1000 meters (increasing pressure).
T (deg C) S (PPT) Z (decibar) SV (m/sec)
9 34.0 500 1493
6 34.1 1000 1490
3 34.2 2000 1494
2 34.3 3000 1507
2 35.0 10000 1631
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Adjustment ToolsAdjustment ToolsData Adjustment in MBMAXData Adjustment in MBMAX•Tide Adjustment, Centerline Method
Interpolates the Tide based on the Time and Position of every data point, from the Tide Files of every Gage, at their stationing along the centerline.
•Tide Adjustment, 3 Point Method:
Planar tide interpolation from 3 stations.
•Heave Adjustment (Delayed Heave), POS/MV and F180:
Applies Post-processed Heave from files logged by the inertial system.
Works great!
•POSPac Adjustments:
Applies corrected position, heave, pitch, roll, heading, and Tide from POSPac *.OUT files.
Example: Heave AdjustmentExample: Heave Adjustment
•Open file containing Post-processed (delayed) Heave.
•Enter hour difference, local minus UTC time.
•Click Adjust to finish.
•Verify it worked by comparing the heave graph before and after adjustment.
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More Adjustment ToolsMore Adjustment Tools
•POSPac Adjustments:
Applies corrected Position, Pitch, Roll, Heading, and Tide from POSPac *.OUT files.
Option to recalculate RTK tides (below).
•HYPACK RAW File Adjustments:
Replace positions with GPS data recorded to the RAW file.
Option to recalculate RTK tides (below).
RTK Tide Recalc:
• Set project geodesy for RTK tides (Geoid model, KTD file, etc.)
• MBMAX: Recalculate tides from project geodesy and WGS latitude, longitude, elevation.
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Phase 2 – Swath EditingPhase 2 – Swath EditingAnother Line by Line ReviewAnother Line by Line Review•Transition Phase 1 to 2: “Convert Raw to Corrected” in File menu.
•Use Filters to remove gross errors.
•Review each line graphically with Manual Edits if needed.
•Second Sweep Window for comparison. Sounding Info for details.
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Phase 2 – Swath EditingPhase 2 – Swath EditingDual Sweep WindowsDual Sweep Windows
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FiltersFilters
Overhang example
Search and Filter SettingsSearch and Filter Settings• Spike: Removes points deviating from average depth (5 soundings).
• Quality: Filters based on sonar quality code.
• Intensity: Filters based on beam intensity value.
• Overhang: Looks for overhang pattern in sweep profile, and removes it. Works great!
Safe unless you’re trying to sound underneath rocks.
• Use HYSWEEP® Survey Limits: Filter based on settings used at survey time.
• Savitsky-Golay: Low pass filter based on curve fitting.
Low to High: Avoids removing good points. Doesn’t always work. Sometimes
removes entire sweeps!
Gate Size: Allowable distance from curve.
Order: Flexibility of curve. Order 2 = straight line.
Window Size: Number of soundings used in curve fit.
Important !! NOT Good with Vertical Surfaces22
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Depth profile from a single sweep: Try to flatten it out.
Bottom curvature: flat bottom = zero curvature.
(Works best in flat areas)
Adjustment Toolbox
Important Assumption:
• Sound Velocity from the sensor at the sonar head is correct.
•Something needs to be right!
Sound Velocity AdjustmentsSound Velocity Adjustments
Bottom slope
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Sound Velocity AdjustmentsSound Velocity AdjustmentsExample 1: Moving Salt Water Wedge
Before:•Bottom curvature is clear – the ‘smiley’ face.
Action:•Block out the salt water wedge and shift it downward (Down Button). Tide’s going out.
Result:•A clear improvement.
•Each survey line can be corrected this way.
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Sound Velocity AdjustmentsSound Velocity AdjustmentsExample 2: Missing SV Profile
Before:•Very poor depth data without a sound velocity profile.
Action:•Use New Profile option.
•Experiment with Gradient until the bottom flattens out.
No Magical Fix here
Result:•New SV profile
•Greatly improved depth data.
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Sweep WindowsSweep WindowsGraphical Review and Manual EditingGraphical Review and Manual Editing•Two windows, each with it’s own zoom level and perspective.
•Zoom, rotate and pan to see and ‘get at’ difficult points.
•Eraser, Block and Line Editing tools.
•1,000 levels of Undo.
•Fast Edit Mode for block and line tools.
Yellow X = points outside filter limits. The old graphics modes are still available.26
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View and Edit OptionsView and Edit OptionsSweep TabSweep Tab•Display Style
Wiggle, Dot and TIN methods use standard Windows® graphics.
Enhanced Sweep Graphics mode supports pan / rotate / zoom and requires OpenGL.
• Edit Mode (for Block and Line delete)
Default: Points are selected but not removed until the delete tool (inside/outside block or above/below line) is pressed.
Fast: The delete tool is pre-selected and points are removed as soon as the mouse button is released. Hence 1,000 levels of Undo!
Block/Default mode. Click inside or outside button to delete.
Block/Fast mode with delete inside pre-selected.
Line/Default mode. Click above or below button to delete.
Line/Fast mode with delete above pre-selected.
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More Editing ToolsMore Editing Tools• F5: Marks a Target.
• Undelete Block: Restores deleted points.
• Point Flag: Flags a questionable sounding for examination in Phase 3.
• Sidescan: Shows the sidescan record to assist editing. If it shows up on sidescan, don’t delete it.
• Hand: Toggles Rotate/Pan Mode on/off
Rotate/Pan On: Mouse pointer is a hand.
Left-Click Mouse Rotates and Tilts the display.
Right-Click Mouse Drags and Pans the display.
Rotate/Pan Off: Mouse pointer is an arrow.
Left-Click Mouse drag places an edit block or line on the display.
Point Flag helps you locate a point later.
Sidescan record. Arrows give sounding location.
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Phase 3 – Area Based EditingPhase 3 – Area Based EditingAll Lines Combined (Overlapping Perspective)All Lines Combined (Overlapping Perspective)
• Transition Phase 2 to 3: “Area Based Editing” in File menu.
• Soundings are grouped in Matrix cells for statistics and display.
• Three Windows: Survey (all data), Profile (matrix row) and Cell.
Profile Window
Survey WindowCell
Window
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Matrix OptionsMatrix OptionsTransition to Phase 3Transition to Phase 3
• Use existing HYPACK® MTX file or,
• Auto-Size to data. Very convenient.
Option to Rotate to Survey Line is useful as profiles will cut across the channel.
• Cell Size:
Auto Cell Size determines best fit, about 25 soundings per
cell. Enough for reasonable statistics.
Matrix Options selected on transition to Phase 3.
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Editing WindowsEditing Windows
Survey WindowSurvey Window•Overview of the entire survey.
•3-D zoom, pan, tilt and rotate to help ‘interpret’ the soundings and select areas of interest.
•View depths or statistics.
Profile WindowProfile Window•Survey cross section. Color coding by survey line makes it easy to compare overlap.
Cell WindowCell Window•Cell statistics; table and histogram.
•Flyers stand out!
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Statistical Search and FilterStatistical Search and FilterSearch and Filter OptionsSearch and Filter Options• Select a statistic to represent each cell. (Median works well.)
• Select limits above and below. Then:
Filter. Be careful not to over-filter.
Search. Locates marginal soundings then you decide.
Filter Limits (yellow) in Cell Window04/18/23
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Save Your WorkSave Your Work
XYZ ReductionXYZ Reduction•Save one XYZ point per cell.
•Select survey depths (by type) or statistics.
Save at any time during an edit session. Save early and save often!
Choose a File FormatChoose a File Format• HS2: For additional editing (MBMAX, CUBE,
Cloud). For export (e.g., Fledermaus).
You should always SAVE to this Format
• XYZ: For export and additional processing (e.g., TIN Model).
• XYZ, Intensity: For intensity mapping.
• GSF: Generic Sensor Format. For Geocoder.
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