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Andrew J. Elmore, Gregory P. Asner, and R. Flint Hughes

objective was intended to prototype an operational fire-monitoring program that must eventually also include fire risk assessment and modeling. Our work also provides a more detailed understanding of how the invasive grass/fire cycle operates at regional scales on the dry leeward slopes of Hawaii. 2. Site description Hawaii is a volcanic island archipelago containing strong climatic gradients leading to a diversity of ecosystem types ranging from tropical rain forests to desert environments ( Figure 1

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Jeffrey T. Morisette, Louis Giglio, Ivan Csiszar, Alberto Setzer, Wilfrid Schroeder, Douglas Morton, and Christopher O. Justice

provide detailed information with which to evaluate the two MODIS fire detection products. A quantitative comparison is accomplished through logistic regression and the application of accuracy assessment curves ( Morisette and Khorram 2000 ) applied to ASTER versus MODIS error matrices. We use the analysis to empirically quantify the detection envelope for the INPE and EOS algorithms with respect to fire size and spatial continuity as estimated by the ASTER fire maps. This paper goes beyond previous

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Eraldo A. T. Matricardi, David L. Skole, Mark A. Cochrane, Jiaguo Qi, and Walter Chomentowski

. 1992 ), increased risk of local species extirpation ( Martini et al. 1994 ), and emissions of carbon ( Houghton 1996 ). Logged forests are increasingly being revisited multiple times to harvest additional tree species ( Uhl et al. 1997 ; Veríssimo et al. 1995 ), exacerbating such problems. Timber extraction is a major land-use activity in the Brazilian Amazon, representing 90% of Brazil’s native wood production (Veríssimo and Smeraldi 1999). Frontier logging operations catalyze deforestation by

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