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Mapping wetlands on beaver flowages with 35-mm photography

Canadian Field-Naturalist

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Abstract

Beaver flowages and associated wetlands on the Chippewa National Forest, north-central Minnesota, were photographed from the ground and from the open side window of a small high-wing monoplane. The 35-mm High Speed Ektachrome transparencies obtained were used to map the cover-type associations visible on the aerial photographs. Nearly vertical aerial photos were rectified by projecting the slides onto a base map consisting ofcontrol points located by plane-table survey. Maps were prepared by tracing the recognizable stands of vegetation in the rectified projection at the desired map scale. Final map scales ranging from 1:260 to 1:571 permitted identification and mapping of 26 cover-type associations on 10 study flowages in 1971. This cover-mapping technique was economical and substituted for detailed ground surveys. Comparative data from 10 flowages were collected serially throughout the entire open-water season. Although developed for analysis of waterfowl habitat, the technique has application to other areas of wildlife management and ecological investigation.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Mapping wetlands on beaver flowages with 35-mm photography
Series title:
Canadian Field-Naturalist
Volume
90
Issue:
4
Year Published:
1976
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
423-431
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
423
Last page:
431
Number of Pages:
9