Hyperspectral remote sensing for shallow waters. I. A semianalytical model.

摘要: For analytical or semianalytical retrieval of shallow-water bathymetry andyor optical properties the water column from remote sensing, contribution to remotely sensed signal has be separated that bottom. The mathematical separation involves three diffuse attenuation coefficients: one for downwelling irradiance ~Kd!, upwelling radiance ~Ku C !, and bottom reflection B !. Because differences in photon origination path lengths, these coefficients general are not equal, although their equality been assumed many previous studies. By use Hydrolight radiativetransfer numerical model with a particle phase function typical coastal waters, remote-sensing reflectance above ~Rrs! below ~rrs! surface is calculated various combinations properties, albedos, depths, solar zenith angles. A ~SA! rrs shallow waters then developed, which explicitly expressed as functions in-water absorption ~a! backscattering ~bb!. inversion, parameters connecting Rrs also derived. It found values determined by SA agree well exact computed ~;3% error!, even different functions. calculations included bbya high 1.5 simulate high-turbidity situations occasionally regions. © 1998 Optical Society America OCIS codes: 010.0010, 280.0280.