![](https://webarchive.library.unt.edu/eot2008/20081106100747im_/http://veimages.gsfc.nasa.gov//9168/nafrica_july84.gif)
Images & Animations
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Credit
NASA/Goddard Space Flight Center Scientific Visualization Studio
African Vegetation: Comparing July 1984 and July 1994
For many years, scientists have believed that the southern expansion of the Sahara has been due to human activity. However, results from the AVHRR instrument and its measurements of vegetation suggest a different explanation: rainfall patterns. In drier years (1984 was one of the driest summers in recorded history in Northern Africa), the Sahara expands south, but in wetter years (such as 1994), vegetation moves back and there is no net expansion of the Sahara as had been previously suggested.
NDVI measures of north Africa, July 1984
Metadata
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Sensor
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Animation ID
589 -
Video ID
SVS1999-0008 -
Start Timecode
0:59:58:00 -
End Timecode
1:00:30:04 -
Animator
Jesse Allen -
Studio
SVS -
Visualization Date
1999/01/01 -
Scientist
Compton Tucker (NASA/GSFC), Sharon Nicholson (Florida State University) -
Keywords
Sahara, GCMD--Location--Africa -
DLESE Subject
Physical geography, Climatology -
Data Date
1984/07, 1994/07 -
Story URL
stories/NDVI/africa_july8494.html -
Animation Type
Regular