gvsig-geoprocess / org.gvsig.geoprocess / trunk / org.gvsig.geoprocess / org.gvsig.geoprocess.app / org.gvsig.geoprocess.app.mainplugin / src / main / resources / help / es / es.unex.sextante.vegetationIndices.ndvi / Nuevo Documento de texto.txt @ 338
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http://earthobservatory.nasa.gov/Library/MeasuringVegetation/ |
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NDVI is calculated from the visible and near-infrared light reflected by vegetation. Healthy vegetation (left) absorbs most of the visible light that hits it, and reflects a large portion of the near-infrared light. Unhealthy or sparse vegetation (right) reflects more visible light and less near-infrared light. The numbers on the figure above are representative of actual values, but real vegetation is much more varied. (Illustration by Robert Simmon). |
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http://www-gem.jrc.it/stars/vis.htm |
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http://en.wikipedia.org/wiki/NDVI |