848 
This indicates that it will be difficult to distinguish 
attacked from unattacked trees on an individual 
tree basis, unless some way can be found to reduce 
the variance of individual measurements. 
5. SUMMARY AND CONCLUSIONS 
High spatial- and spectra'-resolution radiometric 
data have been acquired in south eastern British 
Columbia to investigate the feasibility cf 
distinguishing lodgepoie pines which have been 
recently attacked by the mountain pine beetle, from 
unattacked trees. Our data show small differences 
between the attacked and unattacked trees, but 
these are smaller than the differences between the 
two sites we have studied. 
These findings indicate that more work will be 
needed to understand the general differences 
between the reflectance characteristics of different 
sites, and to reduce the variance of measurements 
cf individual trees. 
Two other sites, Rosen Lake and Elko, are available 
in the data set. There are also more trees in the 
Galloway and Jaffrey sites to add to the sample. It 
is hoped that with this data set it will be possible 
to eventually report a definitive answer to the 
question posed in the title of this paper. 
6. ACKNOWLEDGEMENTS 
The authors are indebted to Art Crane and Raoul 
Wairt of the British Columbia Ministry of Forests 
for helping select a study site containing plenty of 
green attack. Their assistance in conducting the 
field work, along with Ed Fong and Paul Pilon of the 
British Columbia Ministry of Forests, is also 
appreciated. 
Thanks also to Wally McColl of the Canada Centre 
for Remote Sensing for his support in acquiring the 
MEIS data. 
Murtha, P. A., 1986. Photo interpretation of spruce 
beetle-attacked spruce. Canadian Journal of Remote 
Sensing, 11(1 );93—102. 
Parker, Hon. D.. 1989. News Release. Ministry of 
Forests, British Columbia, Sept. 3, 1989. 
Safranvik, L.. Shrimpton, D. M., and Whitney, H. S., 
1974. Management of lodgepoie pine to reduce 
losses from the mountain pine beetle. Forestry 
Technical Report 1, Canadian Forestry Service, 
Victoria, BC, Canada 
Table 1: Minimum and maximum limits for each MEIS 
band. 
Mean 
Band 
Limits 
Wavelenqth 
Minimum 
Maximum 
448 
433 
463 
549 
533 
565 
676 
655 
695 
711 
703 
719 
722 
715 
728 
735 
726 
744 
751 
735 
767 
875 
348 
902 
Table 2: The number of attacked and unattacked 
trees, found at Galloway and Jaffrey, 
which were used in the analysis. 
Location Condition 
S 
Un attacked 
11 
66 
International Journal of Remote Sensing. 9(9):1451- 
1468. 
Hobbs, A. J., and Murtha, P. A., 1983. Visual 
interpretation of four scales of aerial photography 
for early detection of mountain pine beetle 
infestation. In: Renewable Natural Resources 
Foundation Symposium on the Application of Remote 
Sensing to Resource Management, Seattle, 
Washington, pp. 433-443. 
Kneppeck, I. D., Ahern, F. J., 1989. A comparison 
of images from a pushbroom scanner with normal 
color aerial photographs for detecting scattered 
recent conifer mortality. Photogrammetric 
Engineering and Remote Sensing. 55(3):333-337. 
Ahern, F. J., 1988. The effects of bark beetle stress Galloway 
on the foliar spectral reflectance of lodgepoie pine. Jaffrey 
Attacked 
65 
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