Raymond Alfaya 



Science Enqineerinq Research Grouo 

 Long Island University 

 Greenvale, New York 



This group is engaged in remote sensing research, in the area 



of mul t i spectral color aerial photography. They have developed their 



own four-lens mul t i spectral aerial camera which simultaneously exposes 



four spatially identical black and white negatives through different 



optical filters. Using a specially designed additive color viewer, a 



corresDond i ng set of four black and white positives are combined, by 



superposed projection, to produce an additive color display. Because 



this technique permits precise, independent control of the many 



individual variables in photography and viewing, it can distinguish subtle 



differences In the soectral reflectance of land and water masses, which 



are far too small to be detected by conventional color films. The 



group has also developed radiometric instrumentation and techniques for 



measuring reflectance spectra of ground and water target objects, to 



obtain the ground truth which is required for proper support of 



quantitative mul t i spectral photography. 



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