Hw. Carson et al., DETECTION OF YELLOW HAWKWEED (HIERACIUM PRATENSE) WITH HIGH-RESOLUTION MULTISPECTRAL DIGITAL IMAGERY, Weed technology, 9(3), 1995, pp. 477-483
Yellow hawkweed infests permanent upland pastures and forest meadows i
n northern Idaho. Conventional surveys to determine infestations of th
is weed are not practical. A charge coupled device with spectral filte
rs mounted in an airplane was used to obtain digital images (1 m resol
ution) of flowering yellow hawkweed. Supervised classification of the
digital images predicted more area infested by yellow hawkweed than di
d unsupervised classification. Where yellow hawkweed was the dominant
ground cover species, infestations were detectable with high accuracy
from digital images. Moderate yellow hawkweed infestation detection wa
s unreliable, and areas having less than 20% yellow hawkweed cover wer
e not detected.