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Michael O. Gonsalves, LTJG/NOAA Dean J. Battilana, LEUT/RAN
A study in the implementation of a tilted multibeam transducer in an ultra-shallow riverine environment Shallow Survey 2008, Portsmouth NH Token commento Michael O. Gonsalves, LTJG/NOAA Dean J. Battilana, LEUT/RAN University of Southern Mississippi – Summer Survey 2008
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o o o o o o o O o o N o O
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Presentation Overview
Survey Background… Tilted Mount – Increased swath width… Tilted Mount – Data further inshore… Total Propogated Uncertainty… CUBE Filtering Regime… Conclusions…
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University of Southern Miss.
Survey Area Pearl River, LA/MS Port Bienville Industrial Complex University of Southern Miss. Ultra Shallow…
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Available Platforms Open Skiff Draft – 0.30m Knudson SBES LeMoyne
Imagenex DeltaT
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An opportunity for improvement…
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Usable Swath Width vs. Depth
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Swath Width vs. Spot Spacing
Anticipated Survey Conditions
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Percent Gains vs. Traditional Mount
Can survey to 12m without loss
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Tilted mount facilitating inshore acquisition
TD = 1.0m α = 5-deg DS = 11.4m
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Tilted mount facilitating inshore acquisition
SB Draft – 0.3m MB Draft – 1.0m
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Tilted mount facilitating inshore acquisition (cultural features vs
Tilted mount facilitating inshore acquisition (cultural features vs. sloping beach)
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An increased swath…
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Total Propogated Uncertainty
*beep* *boop*
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Total Propogated Uncertainty
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Outerbeam Noise Noisy outerbeams resulting from a truncated receive time… …where outer-fluff is at a constant range…
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Total Propogated Uncertainty
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Processing Pipeline I CARIS HIPS FLEDERMAUS PFM Direct Convert Data
Apply Tide & SV Calculate TPU PFM Direct Create CUBE surface Build PFM from HDCS
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Total Propogated Uncertainty & CUBE
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Processing Pipeline II
CARIS HIPS FLEDERMAUS Convert Data Apply Tide & SV Calculate TPU PFM Direct Create CUBE surface Build PFM from HDCS Edit Hypotheses Filter Soundings
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Hypotheses Editing Paradigm
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Hypotheses Editing Paradigm
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Processing Pipeline III
CARIS HIPS FLEDERMAUS Convert Data Apply Tide & SV Calculate TPU PFM Direct Create CUBE surface Edit Hypotheses Build PFM from HDCS Apply edits to HDCS Quality Control Final Cleaning Filter Soundings
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Final Cleaned Data & Surfaces…
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Final Cleaned Data & Surfaces…
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Crossline Check – IHO Order
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Questions? Conclusions
With proper planning a high-accuracy survey can be conducted with a tilted mount by quantifying: Depth Ranges Desired Resolution Desired Distance from shore Increased outerbeam noise can be handled with a proper filtering scheme Questions?
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