HYSWEEP MULTIBEAM EDITOR a k a MBMAX PROJECT
® HYSWEEP MULTIBEAM EDITOR a. k. a. “MBMAX” PROJECT: SAMPLE EDITING IN MBMAX 11/5/2020 1
MBMAX Phase 3 editing screen: Matrix, Profile and Cell Windows 11/5/2020 HYPACK® 2006 2
MBMAX Features Handles entire survey – or can process a single survey line. Integrated Patch Test, QC and system tests. Multiple views of data, allows user to flag points at any stage and in any window. Set-up is easy to begin processing Save all Data: Soundings + Corrections + Configuration. Correlates sidescan imagery for viewing during processing. 11/5/2020 HYPACK® 2006 3
Starting Up Launch the MULTIBEAM EDITOR from HYPACK® icon bar or Processing menu. You can select one, some or all survey files in the MULTIBEAM EDITOR (up to 255 files). 11/5/2020 HYPACK® 2006 4
File Formats (Input) HSX : HYSWEEP® SURVEY raw format. RAW : HYPACK® 8. 9/MAX raw format. HS 2 : HYSWEEP® edited format. XYZ : XYZ ASCII format. XTF : ISIS multibeam format of Reson and Odom data sets (after conversion); not side scan 11/5/2020 HYPACK® 2006 5
MULTIBEAM EDITOR: Autoprocess and Corrections You can auto process your survey with filtering. – Not recommended, but OK for a quick look at the data. Option to change tide and sound velocity files stored in the raw data file. – New correction will override previous ones; no double correction is made. 11/5/2020 HYPACK® 2006 6
Read Parameters Multibeam 11/5/2020 Selection: Specify each device to be used. Device Info: Reads in offsets from the survey; adjust if needed. Single. Survey Beam Info: General survey information. Presort: Data reduction. GPS Pre-Filter: Specify GPS criteria to use. Advanced: RTK options. HYPACK® 2006 7
Advanced Read Parameters: RTK Tide Options Filter removes tides without RTK fixed integer solution. Methods to avoid double tide correction: – Average tide to remove heave. – Merge tide and heave. With RTK, heave and tide provide the same correction. 11/5/2020 HYPACK® 2006 8
MULTIBEAM EDITOR Process There are 3 Steps to editing. The MULTIBEAM EDITOR will enable only those icons available for each step. 11/5/2020 HYPACK® 2006 9
Edit Phase 1: Raw Data Review line-by-line: Check that all sensors are working. – No flat-lines. Check / edit track lines – GPS spikes. Check / edit heave – Look for drift. Check / edit tide – RTK tide spikes. 11/5/2020 HYPACK® 2006 10
Edit Phase 1: TRUE HEAVE A new option is available to use the TRUE HEAVE output from the Applanix POS M/V. 1. 2. 3. Set the POS Ethernet logging to capture Group 111. Log this file during survey. In the MULTIBEAM EDITOR, select TOOLSHEAVE ADJUSTMENT; Enter the Local time UTC offset and hit ADJUST. Examine the Heave Window for changes. 11/5/2020 HYPACK® 2006 11
Edit Phase 2: Swath Editing Review line-byline: Auto-filter to remove gross errors. Check / edit each line graphically. Added a second view to provide different view angle. Sounding Info dialog shows all information of each point. 11/5/2020 Sounding information 2 views of sounding data for editing HYPACK® 2006 12
Edit Phase 2: Filters available (F 9 -> Filter Options) – Depth – Min and max – Beam number – Angle limit and Offset limit – Spike limit – Quality Limit – Underhang and overhang filters – Hysweep Survey Limits NEW – Savitsky – Golay Filter 11/5/2020 HYPACK® 2006 13
Minimum Depth Filter 11/5/2020 HYPACK® 2006 14
Maximum Depth Filter 11/5/2020 HYPACK® 2006 15
Beam Filter 11/5/2020 HYPACK® 2006 16
Angle Limit Filters 11/5/2020 HYPACK® 2006 17
Offset Limit Filters 11/5/2020 HYPACK® 2006 18
Spike Limit Filter 11/5/2020 HYPACK® 2006 19
Quality Filter 11/5/2020 HYPACK® 2006 20
Overhang & Undercut Filter 11/5/2020 HYPACK® 2006 21
Savitzky – Golay Filter 11/5/2020 HYPACK® 2006 22
The Savitsky – Golay Filter A low pass filter that: – Removes data appearing as high frequency (abrupt bottom changes, outliers), – Keeps low frequency data (somewhat uniform seafloor). The S-G filter calculates a filtered surface over a section. Actual soundings outside a ‘gate’ are rejected. – Gate Size: Acceptance limit above and below the filtered surface – Order: Number of inflection points. – Window: Number of soundings in the filtered surface 11/5/2020 HYPACK® 2006 23
Filtering Example Filters are applied in order, from top to bottom. Save yourself a lot of manual editing by experimenting with the different filters for each data set. AVI 11/5/2020 HYPACK® 2006 24
Edit Phase 2: Sidescan Comparison Seafloor objects detected in soundings can be verified by the sidescan display. Select Sidescan Icon in the tool bar to bring up the image. Arrows on the side of the sidescan point to the object 11/5/2020 HYPACK® 2006 25
Edit Phase 3: Area Based Editing All survey lines are available simultaneously. Three views: 1. Survey: Entire survey in grid display. 2. Profile: One slice through survey – inspect overlap. 3. Cell: One grid cell – detailed inspection of marginal soundings. Scrolling through everything is an option, but it might take a while. An alternative is the statistical search … 11/5/2020 HYPACK® 2006 26
Edit Phase 3: Selecting the MTX Select HYPACK® MTX file (if created) or let the editor create one for you. Rotate to Survey Line is very useful for cell editing. Cell size: – Automatic – MULTIBEAM EDITOR finds the best fit. – Manual - Enter length and width. 11/5/2020 HYPACK® 2006 27
Statistical Search and Filter Select a statistic to represent each cell. Median works best. Select limits above and below. Then: 1. Auto Filter: Be careful! 2. Auto Search: Locates marginal soundings for you. You can limit search and filter with a HYPACK® border file. 11/5/2020 HYPACK® 2006 28
Saving Your Work File Formats: HS 2: Saves all data. 1. Recover deleted soundings. 2. Apply patch test results and offset changes. 3. Reapply tide and SV. XYZ: Export to 1. HYPACK® MAPPER, TIN MODEL, etc. 2. Third party software. MULTIBEAM EDITOR can save data similar to HYPACK® MAPPER (one point per cell). Select XYZ reduction. 11/5/2020 HYPACK® 2006 29
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