Canadian Forest Service Publications

Discrimination of Kalmia angustifolia using compact airborne spectrographic imager (casi) data. 1997. Franklin, S.E.; Gillespie, R.T.; Titus, B.D.; McCaffrey, T.M. Canadian Journal of Remote Sensing 23(1): 71-75.

Year: 1997

Issued by: Pacific Forestry Centre

Catalog ID: 4861

Language: English

Availability: Order paper copy (free)

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Abstract

The regeneration of black spruce (Picea mariana (Mill.) B.S.P.) in central Newfoundland following disturbance by fire or logging can be impeded by the ericaceous shrub Kalmia angustifolia L. This study was initiated to test multispectral compact airborne spectrographic imager (casi) remote sensing data acquired in 1994 to detect the presence of different densities of Kalmia cover on a variety of disturbed sites in central Newfoundland. A discriminant classification approach was designed to separate Kalmia, up to three classes of Kalmia cover (light, moderate, heavy), and other major cover types such as black spruce, alder, non-Kalmia cutovers and wetlands in imagery of four different areas at three times of the year. Discrimination was tested against Kalmia estimates in plots mapped on 1: 1000 scale colour aerial photography and subjected to comprehensive field surveys. The highest discriminant accuracies (up to 97% correct) were obtained using fall imagery, as Kalmia leaves are semi-deciduous and therefore remain on the plants over the fall. Small errors of commission were noted in summer imagery when Kalmia and companion species (blueberry, alder, leatherleaf, etc.) all displayed similar colour and form in leaves.