A’j’mospi]eric Correction of Aviris Data of Monterey Bay Con’i’aminated by ‘1’iiin Cirrus Clouds

Point source n~casurcmcnts (e.g. sun photmnctcr dam, weather station observations) are often Used to constrain radiative transfer models such as MODTRAN/I..OWTRAN7 when atmosphcricall y correcting AVIRIS imagery. “l’he basic assumption is that the atmosphere is horizontally homogeneous throughout the entire area. If the target area of interest is located a distance away from the point mcasurcmcnt position, the calculated visibility and atmospheric profiles may not be charactc]istic of [hc atmosphere over the target. AVIRIS sccncs arc often rcjcctcd when cloud cover cxcccds 10 pcrccnt. However, if the cloud cover is dctcrmincd to bc primarily cirrus rather than cumL]lus, inwa(cr optical properties may still bc cxtractcd over open ocean. High altitude cirrus clouds arc non-absorbing at 744 nm (Rcind, et al, 1992). If the optical properties of the AVIRIS sccnc can be determined from the 744 nm band itself, the atmospheric conditions during the ovcrilight may bc deduced.