Mapping wetlands on beaver flowages with 35-mm photography
Canadian Field-Naturalist
By: R.E. Kirby
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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.
| 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 |
| Publisher | Ottawa Field-Naturalists' Club |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 9 p. |
| First page | 423 |
| Last page | 431 |
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