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Characterization of the Sahel: implications of correctly calculating interannual coefficients of variation (CoVs) from GAC NDVI values

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Abstract. Use of Digital Number (DN) representation of Normalized Difference Vegetation Index (NDVI) values for calculation of the Coefficient of Variation (CoV) of NDVI produces incorrect results. We show how CoV images correctly calculated directly from NDVI values differ from images incorrectly calculated through the use of DNs, and explore the ways in which the legitimate calculation of CoV allows us to revise and refine our perceptions of what we mean by the term 'Sahel'.

Document Type: Research Article


Publication date: 1997-12-01

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