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Use of 35-mm color aerial photography to acquire mallard sex ratio data

Photogrammetric Engineering and Remote Sensing

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Abstract

A conventional 35-mm camera equipped with an f2.8 135-mm lens and ASA 64 color film was used to acquire sex ratio data on mallards (Anas platyrhynchos) wintering in the Platte River Valley of south-central Nebraska. Prelight focusing for a distance of 30.5 metres and setting of shutter speed at 1/2000 of a second eliminated focusing and reduced image motion problems and resulted in high-resolution, large-scale aerial photography of small targets. This technique has broad application to the problem of determining sex ratios of various species of waterfowl concentrated on wintering and staging areas. The aerial photographic method was cheaper than the ground ocular method when costs were compared on a per-100 bird basis.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Use of 35-mm color aerial photography to acquire mallard sex ratio data
Series title:
Photogrammetric Engineering and Remote Sensing
Volume
47
Issue:
6
Year Published:
1981
Language:
English
Description:
p. 823-827
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Photogrammetric Engineering and Remote Sensing
First page:
823
Last page:
827
Number of Pages:
4