Canadian Forest Service Publications
Forest insect damage and cover types from high-altitude color-IR. Photographs and ERTS-1 imagery. 1974. Beaubien, J.; Jobin, L.J. Pages 449-454 in Symp. remote sensing and photo-interpretation, Proceedings: Symposium on Remote Sensing and Photo Interpretation. Banff, Alberta. s.n., S.l.
Issued by: Laurentian Forestry Centre
Catalog ID: 14845
Availability: PDF (download)
Anticosti Island, Qué. has experienced two important outbreaks (1929-34 and 1971-73) of the Eastern hemlock looper (Lambdina fiscellaria fiscellaria (Guen.)). The most recent insect damage caused defoliation and high tree mortality in mature balsam fir (Abies balsamea (L.) Mill.) stands over some 875 sq. miles (2265 km2). A remote sensing study was initiated and high altitude color-IR photographs (scale 1: 70000) were taken over the island in the summer of 1973. Tree mortality which occurred in 1971 can readily be evaluated in classes of 25% on these small-scale photographs with a standard mirror stereoscope. The 1929 damages can be seen on the photos as openings left in the forest; most of these areas are now regenerated. The images have also a surprising potential for identifying species growing in pure or nearly pure stands.
ERTS-1 imagery was also investigated. It shows promising possibilities for mapping broad vegetation cover types, and for monitoring at least severe insect damage to forest.