NDVI Anomalies Show Areas of Likely Drought in the Western US (wide view)
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Satellite data can gauge the health of plants, which is a good indicator of drought. Satellite imagery shows changes in vegetation between 1999 and 2003. The Normalized Difference Vegetation Index (NDVI) measures how dense and green plant leaves are, which suggests overall vegetative health. The NDVI images are also useful as a measure of drought when compared to 'normal' plant health. NASA scientists calculate average NDVI values for an area to find out what is normal at a particular time of year. This data was measured by the vegetation instrument on Europe's SPOT satellite provided by DigitalGlobe/SPOT, under agreement with the U.S. Department of Agriculture Foreign Agricultural Service (USDA/FAS). In 2002, drought had settled across the Midwest. Large dark brown sections of eastern Colorado show where vegetation was less lush and healthy than normal. This version of the visualization is a wide view showing the western United States.
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Push into the western United States showing August NDVI data from 1999 to 2003 (with dates)
Duration: 10.0 seconds
Available formats:
640x480 (30 fps)
MPEG-1
5 MB
720x480 (29.97 fps)
MPEG-2
9 MB
320x240 (30 fps)
MPEG-1
1 MB
320x240
JPEG
5 KB
How to play our movies
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Push into the western United States showing August NDVI data from 1999 to 2003 (without dates)
Duration: 10.0 seconds
Available formats:
640x480 (30 fps)
MPEG-1
5 MB
720x480 (29.97 fps)
MPEG-2
9 MB
320x240 (30 fps)
MPEG-1
1 MB
320x240
JPEG
5 KB
How to play our movies
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NDVI data from Aug 10, 1999 showing greener (wetter) than normal conditions
Available formats:
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TIFF
12 MB
160 x 80
PNG
31 KB
320 x 240
JPEG
23 KB
80 x 40
PNG
7 KB
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NDVI data from Sep 10, 2000 showing some brown (drought) areas in the south west and north west US
Available formats:
2560 x 1920
TIFF
12 MB
320 x 240
JPEG
21 KB
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NDVI data from Aug 10, 2001 showing some brown (drought) areas in Colorado and northern Montana
Available formats:
2560 x 1920
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12 MB
320 x 240
JPEG
21 KB
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NDVI data from Aug 10, 2002 showing widespread brown (drought) areas in Colorado and Arizona
Available formats:
2560 x 1920
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12 MB
320 x 240
JPEG
22 KB
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NDVI data from Aug 10, 2003 showing widespread brown (drought) areas in Colorado and New Mexico
Available formats:
2560 x 1920
TIFF
12 MB
320 x 240
JPEG
21 KB
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Color Table showing below normal as red, brown, orange, and yellow and above normal as greens and purple
Available formats:
319 x 108
JPEG
31 KB
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| Animation Number: | 2937 |
| Animator: | Greg Shirah (Lead) |
| Studio: | SVS |
| Completed: | 2004-05-03 |
| Scientist: | Asaph Anyamba (NASA/GSFC) |
| Instrument: | SPOT-4/VGT-S10 |
| Data set: | Blue Marble |
| Data Collected: | SPOT/NDVI: 1999/08/10, 2000/09/10, 2001/08/10, 2002/08/10, 2003/08/10 |
Keywords:
SVS
>> Drought
SVS
>> NDVI
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Please give credit for this item to
NASA/Goddard Space Flight Center
Scientific Visualization Studio. DigitalGlobe/SPOT data provided under agreement with the U.S. Department of Agriculture Foreign Agricultural Service (USDA/FAS) |
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