Comparison between Argus and X-band and traditional monitoring in a rapidly changing environment

Jantien Rutten, Gerben Ruessink

700m

4000m

citg.tudelft.nlwageningen.ur.nl

Compare RS techniques with ground truth and …... how complementary?

Focus subtidal

Materials & methods

200x200m17min

25x2m2month,1 year,4years

20x10m4hours

25x2m2months

citg.tudelft.nl

wageningen.ur.nlwageningen.ur.nl

Products

• Argus x,y,z (cBathy-CSM)

• Radar x,y,z (SeaDarQ-FFT)

• Jetski x,y,z ground truth

Implementation

Argus• Kalman seed: Jetski bathymetry• Kalman update: max 2m

Radar• Outlier filter: mn & std • 24h average

Bulk comparison

1.5m

4m

SmoothingWave non-linearity

currents?

Argus

Radar

0.7m

0.5m

Errors: spatial variability

Argus

Radar

-7m

-3m

Errors: temporal variability?

-1m-10m

Conclusions

Offsets:– Shallow water: wave non-linearity,

smoothing– Deep water: camera seam, currents? – Spatial variability

Ground truth Argus (cBathy) Radar (SeaDarQ)

Seasonal Week-monthly Week-monthly

Calm Calm storm

Δz ~0.1m Δz ~0.5m Δz ~1.5m

-?< z <-15m -10m < z <-2m -15m < z <-7m

R=?km; (dx,dy)=3,25m R=1km; (dx,dy)=10,20m R=3.5km; (dx,dy)=200,200m

Outlook

• Representative Argus, survey MegaPex

• Argus, radar quality: Vwind , Hrms, currents• Radar shallow water: cBathy