Quanti cation of Suspended Particulate Matter from DAIS/ROISIS Images: case-II waters

and the Re ective Optics System Imaging Spectrometer (ROSIS) acquired sets of images that covered part of the Belgian coast. The acquisition was concurrent with radiometric and bio-physical in-situ measurements. The images were atmo-spherically corrected using measurement from the sun-photometer at Oostende. The resulting water leaving spectra were inverted to constituents concentrations using an explicit and an implicit technique. Although the implicit inversion re-trieves the concentrations of water constituents simultaneously, it was restricted to the spectra of a few pixels in DAIS/ROSIS images. This paper proposes an explicit approach that uses the near infrared (NIR) band 0.802 m and the red band 0.678 m to estimate the concentrations of suspended particulate matter and chlorophyll-a respectively. The advantage of this approach is its applicability to the whole data sets of DAIS/ROSIS. The relative dierence between the re-trieved SPM concentrations from implicit and explicit inversions did not exceed 6 % in turbid waters but was up to 21 % in clear waters. On the other hand the relative dierences between the concentrations of chlorophyll-a, retrieved fro