United States EVI from Summer 2000 to Spring 2001
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Traditional satellite-based mapping of vegetation vigor and amount is based on the way vegetation interacts with red and infrared light. Occasionally, however, those two signals are not enough. MODIS measures light reflected from Earth at a variety of wavelengths, and the Arizona researchers incorporate the additional information into their Enhanced Vegetation Index (EVI). The EVI has increased sensitivity within very dense vegetation, and it has built-in corrections for several factors that can interfere with the satellite-based vegetation mapping, like smoke and background noise caused by light reflecting off soil. The bi-weekly and monthly vegetation index maps have wide usability by biologists, natural resources managers, and climate modelers. They can track naturally occurring fluctuations in vegetation, such as seasonal changes, as well as those that result from land use change, such as deforestation. The EVI can also monitor changes in vegetation resulting from climate change, such as expansion of deserts or extension of growing seasons.
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MODIS EVI observations from June of 2000 through May 2001 for the United States shows the cycle of vegetation from one season to the next-from vegetations summer peak, through the first winter snowfall, to the new growth of spring, and the returning lushness of summer. EVI observations can help determine how human- and climate-induced changes are affecting vegetation in the U.S. and around the world. The three images above show spring arriving in the United States. Vegetation ranges from 0, indicating no vegetation, to nearly 1, indicating densest vegetation.
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Jun 25, 2000
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July 11, 2000
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August 12, 2000
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August 28, 2000
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October 15, 2000
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October 31, 2000
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November 16, 2000
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December 2, 2000
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December 18, 2000
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January 1, 2001
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January 17, 2001
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February 2, 2001
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March 6, 2001
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March 22, 2001
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April 7, 2001
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April 23, 2001
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May 9, 2001
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May 25, 2001
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Video slate reads, 'EVI for the US taken by Terra/MODIS; Spring 2000 through Winter 2001'.
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| Animation Number: | 2318 |
| Completed: | 2001-12-12 |
| Animator: | Joycelyn Thomson (NASA/GSFC) (Lead) |
| Scientists: | Alfredo Huete (University of Arizona) |
| | Kamel Didan (University of Arizona) |
| Writer: | Rebecca E. Lindsey |
| Platform/Sensor/Data Set: | Terra/MODIS (06/25/2000, 07/11/2000, 08/12/2000, 08/28/2000, 10/15/2000, 10/31/2000, 11/16/2000, 12/02/2000, 12/18/2000, 01/01/2001, 01/17/2001, 02/02/2001, 03/06/2001, 03/22/2001, 04/07/2001, 04/23/2001, 05/09/2001, 05/25/2001) |
| Video: | SVS2001-0022 * |
Keywords:
DLESE
>> Agricultural science
DLESE
>> Biology
SVS
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SVS
>> Leaf Area Index
GCMD
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Please give credit for this item to:
NASA/Goddard Space Flight Center Scientific Visualization Studio |
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