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    Microdensitometric analysis of aerial photographs has been used to quantify urban tree stress of deciduous species. A test of this procedure applied to Monterey pine indicates that variations in ground cover beneath urban trees among cities and variations in crown morphology among tree species can limit the ability of microdensitometry to quantify urban tree stress.

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    Nowak, David J.; McBride, Joe R. 1993. Testing microdensitometric ability to determine Monterey pine urban tree stress. Photogrammetric Engineering & Remote Sensing. 59(1): 89-91.

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