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• W2065746564 abstract "Abstract Pine plantations in Australia are subject to a range of abiotic and biotic damaging agents that affect tree health and productivity. In order to optimise management decisions, plantation managers require regular intelligence relating to the status and trends in the health and condition of trees within individual compartments. Remote sensing technology offers an alternative to traditional ground-based assessment of these plantations. Automated estimation of foliar crown health, especially in degraded crowns, can be difficult due to mixed pixels when there is low or fragmented vegetation cover. In this study we apply a linear spectral unmixing approach to high spatial resolution (50 cm) multispectral imagery to quantify the fractional abundances of the key image endmembers: sunlit canopy, shadow, and soil. A number of Pinus radiata tree crown attributes were modelled using multiple linear regression and endmember fraction images. We found high levels of significance ( r 2  = 0.80) for the overall crown colour and colour of the crown leader ( r 2  = 0.79) in tree crowns affected by the fungal pathogen Sphaeropsis sapinea , which produces both needle necrosis and chlorosis. Results for stands associated with defoliation and chlorosis through infestation by the aphid Essigella californica were lower with an r 2  = 0.33 for crown transparency and r 2  = 0.31 for proportion of crown affected. Similar analysis of data from a nitrogen deficient site produced an outcome somewhat in between the other two damaging agents. Overall the sunlit canopy image fraction has been the most important variable used in the modelling of forest condition for all damaging agents." @default.
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• W2065746564 date "2005-05-01" @default.
• W2065746564 modified "2023-10-17" @default.
• W2065746564 title "Assessing plantation canopy condition from airborne imagery using spectral mixture analysis and fractional abundances" @default.
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• W2065746564 doi "https://doi.org/10.1016/j.jag.2004.10.003" @default.
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