Use of middle infrared radiation to estimate the leaf area index of a boreal forest

Boyd, Doreen S., Wicks, Toby E. and Curran, Paul J. (2000) Use of middle infrared radiation to estimate the leaf area index of a boreal forest. Tree Physiology, 20(11), pp. 755-760. ISSN (print) 0829-318X

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The leaf area index (LAI) of boreal forest can be estimated using reflected radiation recorded by satellite sensors. Measurements of visible and near infrared radiation are commonly used in the normalized difference vegetation index (NDVI) to estimate LAI. However, research, mainly in tropical forest, has demonstrated that LAI is related more closely to radiation of middle infrared wavelengths than of visible wavelengths. This paper derives a vegetation index, VI3, based on radiation from vegetation recorded at near and middle infrared wavelengths. For a boreal forest canopy, the relationship between VI3 and LAI was observed to be much stronger than that between NDVI and LAI. In addition, the LAI estimated using VI3 accounted for about 76% of the variation in field estimates of LAI, compared with about 46% when using the NDVI. We conclude that information provided by middle infrared radiation should be considered when estimating the leaf area index of boreal forest.

Item Type: Article
Additional Information: This work was supported by the Natural Environment Research Council [grant number GT96/273/EO].
Uncontrolled Keywords: LAI, middle infrared radiation, NDVI, remote sensing, VI3, AVHRR data, vegetation, cover, satellite, evapotranspiration, reflectivity, reflectance, Africa
Faculty, School or Research Centre: Faculty of Science (until 2011) > School of Geography, Geology and Environment
Depositing User: Kim Forbes
Date Deposited: 22 Jul 2008
Last Modified: 18 Mar 2011 09:53

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