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Abstracto

Inter annual variation of vegetation anomaly over Nigeria using satellite-derived index

Aweda E. D. and Adeyewa Z. D.

Vegetation is a determining factor for agriculture and food security. Therefore, a detailed understanding of vegetation variability and its dynamics is very important as it has to deal with issues such as drought and food security. This paper reports a study of the inter-annual variations of vegetation anomaly over Nigeria using the Normalized Difference Vegetation Index (NDVI) derived from the Advanced Very High Resolution Radiometer (AVHRR) data sets using the visible and near-infrared channel reflectance. The study covers the period between the year 1982 and 2000. The analysis was done for the various vegetation belts of the country with some years of extreme anomalies noted. These anomalies have been linked to extreme El Nino Southern Oscillation (ENSO) events that took place within this period.