Canadian Forest Service Publications

Relating forestry interpreter preference to sensitometric parameters of black and white and normal color aerial films. 1991. Hall, R.J.; Fent, L. ISPRS Journal of Photogrammetry and Remote Sensing 46(6): 328-345.

Year: 1991

Issued by: Northern Forestry Centre

Catalog ID: 11185

Language: English

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The photointerpretation accuracy of forest inventory surveys are highly contingent on the sensitometric attributes of aerial films. The sensitometric characteristics of the products that interpreters prefer to work with was determined as a basis for future specifications of 70 mm large-scale photography. Seven black and white and two color films were compared, of which color-positive film was clearly preferred. Of greater significance were the comparison results between the black and white films. Panchromatic films with an average gradient of 0.9 to 1.2 and a density range of 1.0–1.2 were most preferred for forest photo interpretation. Within each black and white film, interpreters preferred the higher contrast images characterized by the higher average gradients. In general, interpreter preference decreased as the spectral sensitivity of the black and white films increased