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l. Two models of multispectral cameras were developed having 
2 x 4 inch and 3 1/2 inch square formats, each model being available 
in both 6 and 4 inch focal lengths. 
2. A new series of Additive Color Viewers for multispectral 
photography were produced which featured electrical focusing, scale, 
and registration controls, as well as recording of the color image on 
the viewer screen. 
3. Projection printers were produced which allow rapid printing 
of positive transparencies having balanced exposure for use in additive 
color viewers. 
4. A spectroradiometer incorporating a minicomputer was de- 
veloped. This instrument is used to obtain basic in situ data on 
reflectance in the range 0.4 to 1.2 um for up to 80 points in 3 
seconds. Programs are available to analyze these data for selection 
of narrow band filters for multispectral photography. 
Applications of multispectral aerial photography include the 
following projects: 
1l. Previsual detection of root rot in avocado trees in 
South Africa. 
2. Speciation of crops and detection of stress for yield 
prediction in Pennsylvania. 
3. Detection of opium poppies throughout the world. 
4. Previsual detection of Dutch elm disease. 
5. Detection of copper sulfide Gussans in South West 
Africa. 
6. Biogeochemical mineral exploration by detecting vege- 
tation stress in Arizona. 
7. Water pollution detection in Boston Harbor. 
8. Wetlands mapping by speciation of S. Alternaflora and 
S. Patens in South Carolina and New York State. 
9. Soil moisture measurements in New York State. 
10. Detecting of ground water leachates through stress 
on vegetation in Connecticut. 
11. Camoflage detection. 
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