Recent Argus Developments In North America Rob Holman SECNAV/CNO Chair in Oceanography
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Recent Argus DevelopmentsIn North America
Rob HolmanSECNAV/CNO Chair in Oceanography
Oregon State University
• Tessellation Arrays and NCEX
• Sensor Quality and Resolution
• Objective Focusing
• Recent Stereo Results
• Argus III
• Cross-geom Hurricane Isabel, Duck, 09/18/03
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Note that these techniques are in development and aren’t yet available for release.
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Argus and the NCEX Field Experiment
NCEX = Nearshore Canyon Experiment,
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NCEX Argus Coverage
C1
C2
C3
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Pixel Instrument Coverage (example)
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Packing of Alpha Arrays into a
Tessilation Tile
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shoreline
NCEX Tessellation Array
Resolution limited (5 m)
1842 pixels
tile
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Directional Spectrum Example
f < 0.33 Hz, k-2 normalized.
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Tessellation Arrays
• Produce wave directional spectrum at any location
• Query at an array of locations
• Extract simple statistics (peak direction?)
• Use same lag array for depth estimation
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NCEX Array, 09/03
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NCEX Array, 09/03 (blow-up)
Runup
“Old” Bathy Line
Vbar
Tess(alpha and bathy
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Vertically-displaced Stereo
C1, z = 43.1 m C1, z = 28.2 m
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Stereo Profile Test Update
08/14/03
Survey courtesy of the FRF
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Lens Quality
Modulation Transfer Function (MTF)
•Ratio of the spectrum of a sensed signal to the source
•Measures the quality of the CCD chip as well as the lens
•Test image is random noise image (looks gray)
wavenumber
Spec
tra
dens
ity
1.0
wavenumber
Spec
tra
dens
ity
1.0
Ideal Real
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Modulation Transfer Function (MTF)
not
Scaled to show number of “effective pixels” at roll-off Effect of “sharp” setting
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Objective Lens Focusing?
Can we use the spectral fall-off in an image to tell when the focus of a lens is optimum?
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Objective Lens Focusing
Focus was slowly adjusted through a sequence of images
+
+
+
+
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Argus III Upgrade (North America)
Argus II Argus III
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Argus Collection Strategies
Argus II Argus III
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Crossgeom
GCP’s in viewNo GCP’s
AutogeomCrossgeom
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Crossgeom
Use overlapping, high-contrast area of snapshots as temporary template (requires Argus III for synchronous snaps)
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Longshore Current?
x, cross-shore
y, alongshore
v, longshore current
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Field Test
• Mean currents
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Field Test
smvrms
vvv
diff
isdiff
/10.0)( =
−=
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Field Test
• Surface dynamics– Alongshore wind
stress
– Alongshore roller stress
ivyad
windy wwC ρτ =
)sin()sin(9.0 20 αβρτ sr
yroller Hg=
y
sv
diffvz
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Field Test• Alongshore wind stress
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Questions?
Not a hurricane Hurricane