Mapping wetlands on beaver flowages with 35-mm photography

TL;DRAbstract

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 ontoa base map consisting of control 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 applicat

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