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Leaf area index (LAI) is a key canopy descriptor that is used to determine foliage cover, and predict photosynthesis and evapotranspiration in order to assess crop yield. Its estimation from remote sensing data has been the focus of many investigations in recent years. In this context, we have used ground measured reflectances to study the potential of(More)
OBJECTIVES The objective of this study was to investigate variants of case-crossover design for assessing correlations between counts of health events over time and exposure to ambient air pollution. For illustrative purposes, daily emergency department (ED) visits for depression among females were considered. MATERIALS AND METHOD Ambient nitrogen dioxide(More)
The purpose of this study was to assess an association between ambient sulfur dioxide and the number of emergency department (ED) visits for ischemic stroke and seizure. The study used data collected in a Vancouver (Canada) hospital in the years 1999-2003. Daily ED visits diagnosed as ministroke, stroke, or seizure were investigated using the case-crossover(More)
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