. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography corrected without an in-flight calibration with targets known spectral response. of. 432101 2345 CENTIMETERS FROM CENTER OF PHOTOGRAPH Figure 5,1 Example of the. effect of vignetting in aircraft film data on the -percent transmittance of blue C450nm) and green (550 nm) light> and on the blue/green ratio. Aerial color- positive film was used in the RC-8 camera. Because the scale of the satellite photos is so much smaller than that of the aircraft
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography corrected without an in-flight calibration with targets known spectral response. of. 432101 2345 CENTIMETERS FROM CENTER OF PHOTOGRAPH Figure 5,1 Example of the. effect of vignetting in aircraft film data on the -percent transmittance of blue C450nm) and green (550 nm) light> and on the blue/green ratio. Aerial color- positive film was used in the RC-8 camera. Because the scale of the satellite photos is so much smaller than that of the aircraft photos, discontinuities such as fronts and eddies are recorded in only a small area of the photo. By comparison, similar elements have to be recorded over large areas of single aircraft photos, or even in a sequence of such aircraft photos. The practical effect of this scale difference is that variations in film density related to position on the photo can be ignored where the area of interest covers only a small area of the photo. Of course comparisons between areas widely scat- tered over the photo are still subject to the problem of spatial density in the photo. All of the pertinent SL-M- duplicate films were analysed on a hybrid transmissometer. The light table and associated aper- tures, filters, and diffuse acceptor are from a Welch Densichron densitometer. The light sensor and associated electronics are a Gamma Digital Photometer. The transmission of each of the three color filters and of the white light setting was calibrated with a non-silver standard step wedge which is traceable to standards. Such a step-wedge is a better approximation to the actual attenuation characteristics of color film than the usual silver grain step wedges. This is because color films do not have any silver in the final image, depending instead on dye 144. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
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