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dc.contributor.authorZarco-Tejada, Pablo J.-
dc.contributor.authorMiller, John R.-
dc.contributor.authorHarron, J.-
dc.contributor.authorHu, B.-
dc.contributor.authorNoland, Thomas L.-
dc.contributor.authorGoel, N. S.-
dc.contributor.authorMohammed, G. H.-
dc.contributor.authorSampson, P. H.-
dc.identifier.citationRemote Sensing of Environment, 89(2), 189-199en_US
dc.description.abstractLeaf chlorophyll content in coniferous forest canopies, a measure of stand condition, is the target of studies and models linking leaf reflectance and transmittance and canopy hyperspectral reflectance imagery. The viability of estimation of needle chlorophyll content from airborne hyperspectral optical data through inversion of linked leaf level and canopy level radiative transfer models is discussed in this paper. This study is focused on five sites of Jack Pine (Pinus banksiana Lamb.) in the Algoma Region (Canada), where field, laboratory and airborne data were collected in 1998 and 1999 campaigns. Airborne hyperspectral CASI data of 72 bands in the visible and near-infrared region and 2 m spatial resolution were collected from 20 20 m study sites of Jack Pine in 2 consecutive years. It was found that needle chlorophyll content could be estimated at the leaf level (r2 = 0.4) by inversion of the PROSPECT leaf model from needle reflectance and transmittance spectra collected with a special needle carrier apparatus coupled to the Li-Cor 1800 integrating sphere. The Jack Pine forest stands used for this study with LAI > 2, and the high spatial resolution hyperspectral reflectance collected, allowed the use of the SPRINT canopy reflectance model coupled to PROSPECT for needle chlorophyll content estimation by model inversion. The optical index R750/ R710 was used as the merit function in the numerical inversion to minimize the effect of shadows and LAI variation in the mean canopy reflectance from the 20 20 m plots. Estimates of needle pigment content from airborne hyperspectral reflectance using this linked leafcanopy model inversion methodology showed an r2 = 0.4 and RMSE = 8.1 Ag/cm2 when targeting sunlit crown pixels in Jack Pine sites with pigment content ranging between 26.8 and 56.8 Ag/cm2 (1570–3320 Ag/g).en_US
dc.description.sponsorshipThe authors gratefully acknowledge the financial and inkind support provided for this research through the Centre for Research in Earth and Space Technology (CRESTech), the Ontario Ministry of Natural Resources, the Canadian Forestry Service, the Ministry of Environment and Energy, GEOIDE (Geomatics for Informed Decisions), part of the Canadian Networks of Centres of Excellence programme and the Canadian Space Agency.en_US
dc.format.extent4085 bytes-
dc.subjectCanopy modellingen_US
dc.subjectNeedle reflectanceen_US
dc.subjectOptical indicesen_US
dc.subjectRadiative transferen_US
dc.titleNeedle Chlorophyll content estimation through model inversion using hyperspectral data from Boreal Conifer Forest Canopiesen_US
dc.description.peerreviewedPeer revieweden_US
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