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Analysis of the dynamics of African vegetation using the normalized difference vegetation indexImages at a resolution of 8 km are currently being generated for the whole of Africa, displaying the normalized difference vegetation index (NDVI). These images have undergone a process of temporal compositing to reduce the effects of cloud cover and atmospheric variation. When the NDVI is plotted against time, different cover types are shown to have characteristic profiles corresponding closely with their phenology. The resultant pattern of NDVI values displayed on the images is analyzed in terms of the cover types present and local variations in rainfall. Comparison between images for 1983 and 1984 overall showed considerable similarities, but significant differences were observed in the northward extent of the greening wave in the Sahel, the greening up of the Kalahari Desert and East African communities. It is concluded that vegetation monitoring using NDVI images needs to be associated with scene stratification according to cover type.
Document ID
19870037505
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Townshend, J. R. G.
(Reading University United Kingdom)
Justice, C. O.
(Maryland, University College Park, United States)
Date Acquired
August 13, 2013
Publication Date
November 1, 1986
Publication Information
Publication: International Journal of Remote Sensing
Volume: 7
ISSN: 0143-1161
Subject Category
Earth Resources And Remote Sensing
Accession Number
87A24779
Funding Number(s)
CONTRACT_GRANT: NAG5-399
Distribution Limits
Public
Copyright
Other

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