Full text: Proceedings of Symposium on Remote Sensing and Photo Interpretation (Vol. 1)

450 
ZUSAMMENFASSUNG 
Anti< 
Forei 
Die Insel Anticosti Que. wurde zweimal von Lambdina fisoellaria July 
fisoellaria (Guen.) heimgesucht, und zwar von 1929 bis 1934 und von 1971 bis load» 
1973. Während der letzten Periode wurden 875 quadrat Meilen (2265 km 2 ) des lengl 
Tannenwaldes ( Abies balsamea (L.) Mill)von diesem Insekt befallen und mehr aeri; 
oder weniger verwüstet. (152 
natl; 
Die Möglichkeit den Schaden auf einem, bei großer Hohe aufgenommenen very 
(Mass Stab 1:70000), infraroten Luftbild, wurden im Sommer 1973 untersucht. 
Mit einem Spiegel Stereoskop ist es verhältismäßig leicht 25%-Mortali- 
tä’tsklassen auf diesen Bildern, trotz des kleinen Masstabs, zu erkennen. In (800' 
mehreren Fällen war es sogar möglich die Baumart einiger Reinbeständen zu custl 
bestimmen. was , 
dist 
Die vom Satellit ERTS-1 aufgenommenen Bilder ermöglichen ebenfalls, a n 
in erstaunlicher Weise, die Lokalisierung auf größeren Flachen der schweren was 
Insektenschäden sowie die Kartierung der Vegetationstypen. tree 
gree 
tone 
INTRODUCTION 
Two important outbreaks (1929-34 and 1971-73) of the Eastern hem- f or 
lock looper {Lambdina fisoellaria fisoellaria (Guen.)) on Anticosti Island, Stan 
Que. were reported. The most recent insect damage caused light to severe were 
defoliation and some tree mortality in mature balsam fir {Abies balsamea Witt 
(L.) Mill.) stands over some 875 sq. miles (2265 km 2 ) (Beaubien and Jobin an( j 
1974). The current methods used to estimate the extent of forest insect sket 
damage over large areas rely on aerial visual surveys (sketch mapping) 
and various types of ground surveys. These are costly, time consuming, 
require considerable man hours of effort, and their accuracy varies with also 
observers backgrounds and motivations (Rhode and Moore 1973). People an( j 
responsible for control operations need more accurate surveys and more 
detailed information (such as tree species attacked, stand and site con 
ditions) not always provided by sketch mapping. Remote sensing techniques 
can potentially provide the forest manager with a more rapid and accurate 
damage assessment, and permanent records of information useful in the Aeri 
study of ecological factors affecting forest insect pests. 
According to many authors, color and chiefly color-IR aerial tali 
photographs are a valuable tool to evaluate forest damage (Murtha 1972, smal 
Ciesla et al. 1971, Rhode and Moore 1973). Until now, most of the stu- dama 
dies carried out on this subject investigated the usefulness of large to viev 
medium photo scales for detecting forest insect damage. Recently Ciesla star 
(1974) obtained encouraging results using high altitude color-IR photo- exce 
graphs. visi
	        
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