R. Santer et C. Schmechtig, Adjacency effects on water surfaces: primary scattering approximation and sensitivity study, APPL OPTICS, 39(3), 2000, pp. 361-375
The making of atmospheric corrections is a critical task in the interpretat
ion of ocean color imagery. In coastal areas, a fraction of the light refle
cted by the land reaches a sensor. Modeling the reduction of image contrast
when the atmospheric turbidity increases, the so-called adjacency effect,
requires large amounts of computing time. To model this effect we developed
a simple approach based on the primary scattering approximation for both n
adir and off-nadir views. A sensitivity study indicates that the decisive c
riterion for measurement accuracy for aerosols is their vertical distributi
on. As this distribution cannot generally be determined from space, it is n
ot possible to include a suitable correction of the adjacency effects on sa
tellite imagery. Conversely, we propose a simple correction for molecular s
cattering based on the isotropic approximation. We also address the problem
of reduction of the coupling between the Fresnel reflection and the atmosp
here for observations of coastal water. We study the influence of the adjac
ency effects on determination of the abundance of chlorophyll in water by c
ombining use of the red and the infrared bands for aerosol remote sensing a
nd the blue/green-ratio technique for retrieval of these data. (C) 2000 Opt
ical Society of America OCIS codes: 010.0010, 010.1310, 010.4450.