A nice 1-band study case
Quite interesting though for training,
for the following reasons:
- Foul waters: plumes of suspended sediments abound. Therefore optical modeling of this image is a "Natural Hazard"!
- Wave breakers: shoals exposed to oceanic swell exhibit wave breakers: this shall be a challenge for optical calibration
- Aliens: aliens can play bad tricks for one who undertakes shallow water modeling
- popular aliens are clouds and their shadows, lumps of haze, sun and sky glint, wave breakers, sailing boats, artificial calibration targets submerged or on the beach, floating/drifting vegetal mats
- each requires a specific attention
- Narrow dynamic range: radiance of damp bright sands at null depth is approx DN=70 only
- bottom contrast in the green band is at most 70-30=40
- Coastal: coastal waters with fairly poor water penetration
- Seatruth: still, the optical calibration of the water type using Jerlov's data works well,
- One-band case: therefore,
- and because the bottom is mostly clean sands in this highly dynamic environment ,
- this image is a good illustration of the one-band case.
- Jerlov's data: this case demonstrates clearly that
- Reference: this site has been extensively investigated by V. Lafon, J. M. Froidefond, F. Laher, and P. Castaing, "SPOT shallow water bathymetry of a moderately turbid tidal inlet based on field measurements", Remote Sensing of Environment, 81, 2002, 136-148 .