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Overview of MAC Resources &Update on Sea Acceptance Tests of Multibeam Systems on New VesselsVicki Ferrini (LDEO)Paul Johnson (UNH/CCOM-JHC)Kevin Jerram (UNH/CCOM-JHC)

What is the MAC?Multibeam Advisory CommitteeA community-based effort with the goal of ensuring that high-quality multibeam data are consistently collected across the U.S. Academic Research FleetMotivated by 2010 workshop at NSF focused on issues with MB performance Funded in 2011; Renewed in 2015

What was the problem ?Research vessels are used for many different types of oceanographic workMultibeam systems are just one of many complex sensors on each shipTribal Knowledge does not scaleEfficiencies gained through coordination

Modified From: http://evillusionist.files.wordpress.com/2012/05/call-center-cartoon-149.jpg

Why Is It Important ?< 15% Global Ocean is MappedOpportunistic data is very important - Every Ping Counts!

GMRT1992

R2R2009MAC2011Complementary Fleet-Wide Multibeam EffortsGOAL: Well-documented high-quality publicly available data

Multibeam Advisory Committee (MAC)QAT - Ensure multibeam sonar systems are operated in a consistent manner that maximizes data accuracy, precision, and scientific utility (Ferrini, Jerram, & Johnson)SAT - Ensure all hull-mounted multibeam systems are installed, calibrated, and configured properly and consistently (Johnson, Jerram)ANT - Perform acoustic noise tests to assess and potentially improve sensor efficiency (coverage) and data quality (Gates)

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MAC GoalsEngage Community of StakeholdersOperating Institutions, Technicians, Scientists, Funding AgenciesIndustry hardware/softwareSpecialistsShare information within and beyond UNOLS (e.g. NOAA, OET, SOI, etc)Facilitate communicationDevelop consistent protocols & best practicesComplement other fleet-wide effortsEducate the next generation

MBES Across the FleetKongsbergEM122KongsbergEM302KongsbergEM710/EM712Reson 7125AtlantisXHealyXKilo MoanaXXLangsethXMelvilleXArmstrongXXPalmerXRevelleXRideXXSikuliaqXXThompsonXSharpX

MAC Ship VisitsAt the request of OperatorsMost useful interaction boots on the deckDifferent team(s) deployed,depending upon needs of shipSAT/QAT/ANT share common tools and techniques Standard protocols for assessing systems across fleetReport generated for each visitInitially only for the operatorAfter review, publicly available on MAC website

Ship Visits SAT/QATSystem ReviewSensor locations/offsetsPatch TestAccuracy AssessmentSwath Performance TestNoise Testing Water Column & BackscatterMAC activities complement manufacturer testing & assessmentSAT = baseline; QAT = check-up

System ReviewReview & Document Sensor OffsetsMBES TX/RX, GPS, MRUReview Reference Frames

Patch TestResidual angular offsets between motion sensor and sonar arrays (pitch, heading, and roll) Timing issues (latency)Recommended when:system is newancillary systems are moved (e.g. MRU, GPS)multibeam data is aprimary cruise objectiveCan be conducted remotely

Remote Patch TestProtocolMAC selects site & developssurvey planShip runs survey planPython script minimizesdata file sizeData transmitted to shoreMAC evaluates & advises2014Marcus G. Langseth2016Marcus G. LangsethAtlantis

Accuracy AssessmentAfter system assessmentSmall survey with cross-line AnalysisExclude grid nodes with:Few pingsSlopes > 5Compute depth biasCompute depth standard deviation Reference Surface grids are publicly available

Swath Performance TestQuantify swath width at a range of depthsSystem healthImportant forsurvey planning

Basic Noise TestingBuilt-In Self Test (BIST)Platform noise environmentActive and passive RX noise measurements Variety of speeds Variety of headings relative to the prevailing swellImpedance measurements Baseline & monitoring early warning signs for transducer degradationRoutine BISTs encouraged

Ship Self Noise vs Speed

Impedence

Acoustic Noise Team (ANT)Detailed assessment of ship acoustic characteristicsIdentify sources of noiseShip noiseCavitationBubble sweep-downMachineryAcoustic interferenceRecommend strategies to minimize noise

Images from Tim Gates

MAC SAT VisitsR/V Hugh Sharp Reson 7125 [2012]R/V Kilo Moana EM122 & EM710 [2012, 2015]RVIB Nathaniel B. Palmer EM122 [2014, 2015]R/V Sikuliaq EM302 & EM710 [2014]R/V Neil Armstrong - EM122 & EM710 [2016]R/V Sally Ride - EM122 & EM712 [2016]

August 2014 Plan:EM302 & EM710 SATSystem ReviewPatch TestAccuracy AssessmentSwath Performance TestPreliminary NoiseBackscatter & Water Column ReviewReality:Challenging sea state and ocean conditions at times Successful calibration and testing

R/V Sikuliaq

R/V Sikuliaq - 2016Antenna relocation and resurvey in San DiegoEM710 / EM302 calibration during coring trials

R/V Neil ArmstrongFebruary 2016 Plan:EM122 & EM710 SATSystem ReviewPatch TestAccuracy AssessmentSwath Performance TestPreliminary NoiseReality:Challenging sea state and ocean conditionsSuccessful calibration and testing

R/V Sally Ride - SATJuly 2016 Plan:EM122 & EM712 SATSystem ReviewPatch TestAccuracy AssessmentSwath Performance TestPreliminary NoiseReality:Challenging sea state at timesSuccessful calibration and testing

R/V Sally Ride

1X2X3X4X5X6X7X8X

EM122 Swath Analysis Comparison

Neil ArmstrongSally RideBoth achieved > 5X water depth in water < 2 kmTested to > 5km depth Tested to < 3km depth

Open Access Resources & ReportsTechnical ReportsTechnical ResourcesHelp Desk

The Early Days of the MAChttp://mac.unols.org

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Technical ReportsUNOLS ship visitsANT, QAT, & SAT ReportsReports from pre-MAC visitsNOAA ship visitsOther ship visitsR/V Falkor & EV NautilusNot supported under NSF GrantAllows for development of new tools & techniques to be contributed back to MACBroadens our understanding of MBES

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MAC Technical ResourcesSoftware ToolsSVP Editor (new version in 2016)Extinction Tool (VM - 2016)Accuracy Assessment (VM - 2016)Mapping Tools (VM - 2016)BIST Plotting (VM - 2016)BIST Database (2016)CookbooksUsing SIS, Caris, etcMore ComingDocumentationGEBCO, NOAA, etc

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Cookbooks

SIS StartupWater Column OptimizationComing SoonPatch Test (Caris & Qimera) Site SelectionUpdated SISWorking With Caris

QAT Shore-based Activities Develop Best Practice DocumentationRemote Patch TestsHelp DeskTroubleshootingAssist Scientistssurvey planningdata processing

mac-help@unols.org

QAT Coordinate with Fleet-wide MB Data Quality Efforts Code share & reviewExtinction plots integrated into GMRT workflow & reportsAssessment of R2R MB QACompare with GMRT reports

Next StepsOngoing MAC Technical Team activitiesPoster at 2016 AGUBIST Database [under development]Encyclopedia of lessons learnedProblems DiagnosticsUNOLS-wide coordination related to potential acoustic interference

http://mac.unols.org