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Declining Quality of B&W Infrared Aerial Photography -- And What to Do about It

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Abstract:

Adoption by the aerial photography industry of automated electronic dodging and printing techniques, associated with a shift to low-contrast negatives to suit photogrammetric applications, has seriously impaired the tonal contrast essential to medium-scale black and white infrared forest photography. In comparisons of various types of 1:15, 840 coverage of a representative forested area, experienced interpreters agreed that tonal quality of photography conventionally provided in Minnesota could be improved by using a Zeiss C filter, holding film exposure slightly below normal, processing to a contrasty negative, and printing on medium contrast paper.

Document Type: Journal Article

Affiliations: Staff Scientist at the University of Minnesota College of Forestry

Publication date: April 1, 1978

More about this publication?
  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.
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