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Tomas F. Domingues, Joseph A. Berry, Luiz A. Martinelli, Jean P. H. B. Ometto, and James R. Ehleringer

as where R sample and R standard are ratios of 13 C to 12 C. The precision of the isotopic measurements was 0.2‰. Foliar total nitrogen contents were obtained with the elemental analyzer in a mass basis (gN per gram of leaf sample) and multiplied by the correspondent LMA in order to express it on an area basis (gN m −2 ). 2.4. Leaf-level gas exchange Photosynthetic assimilation rates at saturating light ( A max ), stomatal conductance to water vapor at A max ( g s @ A max ), maximum rates

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Gregory P. Asner, David E. Knapp, Amanda N. Cooper, Mercedes M. C. Bustamante, and Lydia P. Olander

program is integrated into the CLAS processing stream and uses average monthly aerosol optical thickness (AOT) and water vapor (WV) values from the NASA MODIS sensor. Time stamping of MODIS AOT and WV with Landsat data is done on an automated basis ( Figure 3 ). A series of masks are designed to exclude clouds, water bodies, cloud shadows, and nonimage areas from the analysis. These masks are derived directly from the raw and calibrated Landsat imagery as well as from the AutoMCU submodel output of

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Carlos M. Souza Jr., Dar A. Roberts, and AndréL. Monteiro

least 14 image control points. The root-mean-square (rms) varied from 0.53 to 0.97, which assures that the changes detected over time were not contaminated by misregistration ( Verbyla and Boles 2000 ). The Landsat ETM+ image from 1999 was first radiometricaly corrected using the gains and offset provided in the image metafile. Next, an atmospheric correction was performed using Atmospheric Correction Now 4.0 (ACORN; Analytical Imaging & Geophysics, Boulder, Colorado). Visibility and water vapor

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