Democratization of Coastal Wave-field Analysis...
Transcript of Democratization of Coastal Wave-field Analysis...
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Democratization of Coastal Wave-field Analysis through
iPhone Characterization
Roman Ackley, Cecilia Hsu, Benjamin Huang, Collins Metto
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Spain Zumaia
Itzurun
RocosaSantiago
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Types of Waves
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iPhone accelerometer
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Existing uses of smartphone accelerometers in literature
“A Mobile and Ubiquitous Approach for Supporting Frailty Assessment in Elderly People”
J. Fontecha et. al.
“MyShake: A smartphone seismic network for earthquake early warning and beyond”
Q. Kong et. al.
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$58,000+ $18
Methods of measuring wind waves
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iPhone: Waves vs. Walkingocena waves and tides
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Walking in Jadwin
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Motivation● Democratizing science● Determine bathymetry
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Questions
● Are accelerometer data taken from VibSensor on an iPhone in an ocean wavefield distinguishable from arbitrary data?
● Do wave periods produced by iPhone-VibSensor accelerometer data closely match those produced by photogrammetry?
● Is tide height strongly correlated with wave periodicity?
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iPhone: Consistency
25 s 4 s
1.25 s .66 s
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Itzurun BeachItzurun Beach, 9:49-58 AM
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Photogrammetry vs. iPhone-VibSensor
Average Photogrammetric Period:13.7
Average Accelerometer Period:12.6
Percent Error:8%
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Scientific Application: Tide Height at Rocosa
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Tide and Wave Frequency
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Conclusions● Wave fluctuations measured through VibSensor were less noisy than arbitrary
iPhone movements.● The iPhone accelerometer through VibSensor was able to capture major wave
frequencies, as suggested by photogrammetry.● Tide height is correlated with wave periodicity. Why might this happen?
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Acknowledgements● Many thanks to Liam O’Connor, Sanna Lee, and Sierra Castaneda for lending
us their iPhones.● Thanks to Joe Zhang and Sarah Betancourt for weather data, Emmanuel
Teferi and James Smith for beach visuals, and Nick Ritter for GPS points.● Thanks to Frederik Simons and Adam Maloof, for making it all possible.
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questions?