Mapping wetlands on beaver flowages with 35-mm photography

Canadian Field-Naturalist


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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
Larger Work Title Canadian Field-Naturalist
First page 423
Last page 431