Live statusAwaiting live GPS connectionLast updated buoy positionNot available yet
Map color scale
Street map
Lower clipMidpointUpper clip
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Select a field layer to display its color scale.
Observed bulk-parameter time series
Waiting for private telemetry.Measured Spotter time series
Wave spectra and bulk values
Selected observationSelect a live buoy
Spectral availability will be checked after selection.
1D power spectrumFrequency (Hz) · m² Hz⁻¹
No data available
2D power spectrumComing-from direction (°) · frequency (Hz) · m² Hz⁻¹ rad⁻¹
Power scalem² Hz⁻¹ rad⁻¹
Low—Mid—High—
No data available
Significant wave height
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Mean period
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Peak period
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Mean square slope (MSS)
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i
Mean square slopeMSS=f∑g2(2πf)4E(f)Δf
High-frequency directional spread
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i
High-frequency directional spreadR1(f)=a1(f)2+b1(f)2σθ(f)=2[1−R1(f)]=2[1−a1(f)2+b1(f)2]radiansσθ(f)=π1802[1−a1(f)2+b1(f)2]degreesσHF=∫0.20.5E(f)df∫0.20.5E(f)σθ(f)dfσHF=0.2≤fi≤0.5∑EiΔfi0.2≤fi≤0.5∑Eiσθ,iΔfiCalculate spread independently in each valid frequency bin, then take its energy-weighted mean over 0.2–0.5 Hz. No valid bins returns NaN.
Peak-frequency directional spread
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i
Peak-frequency directional spreadfp=fargmaxE(f)FPDS=σθ(fp)=π1802[1−clip(a1(fp)2+b1(fp)2,0,1)]The existing spectral peak bin is used; an invalid bin returns NaN.
No data availableWave spectra have not been published for the selected time.
Release
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End
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Duration
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Distance
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Forcing
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Result
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ArcTrac displays the latest available public Spotter positions and observations published by
Bada.