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Identifying high production, low production and degraded rangelands in Senegal with normalized difference vegetation index data

August 24, 1993

Seasonal herbaceous vegetation production on Senegal's native rangelands exhibits high spatial and temporal variability. This variability can be monitored using normalized difference vegetation index (NDVI) data computed from 1-km resolution Advanced Very High Resolution Radiometer (AVHRR) image data. Although annual fluctuations in rainfall account for some of the variability, numerous long-term production patterns are evident in the AVHRR time-series data. Different n productivity reflect variations in the region's climate, topography, soils, and land use. Areas of overgrazing and intensive cultivation have caused long-term soil and vegetation degradation. Rangelands of high and low productivity, and degraded rangelands were identified using NDVI. Time-series image data from 1987 though 1992 were used to map relative rangeland productivity. The results were compared to detailed resource maps on soils, vegetation and land use. Much of the variation in rangeland productivity correlated well to the known distribution of resources. The study developed an approach that identified a number of areas of degraded soils and low vegetation production.

Citation Information

Publication Year 1993
Title Identifying high production, low production and degraded rangelands in Senegal with normalized difference vegetation index data
DOI
Authors G. Gray Tappan, Lynette Wood, Donald G. Moore
Publication Type Article
Publication Subtype Journal Article
Series Title Pecora 12 Symposium
Series Number
Index ID 70113701
Record Source USGS Publications Warehouse
USGS Organization

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