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- W2117291451 abstract "There has been much debate concerning the concept of degradation and desertification in semi-arid lands, in particular semi-arid Sub-Saharan Africa, during the last two decades. However, recent findings suggest a consistent trend of increasing satellite-derived vegetation greenness in much of the African Sahel as interpreted from Pathfinder Advanced Very High Resolution Radiometer (AVHRR) Normalized Difference Vegetation Index (NDVI) data for the period 1982-1999. The Sahel has suffered several devastating droughts and famines during recent decades and an increasing trend in NDVI could be interpreted as a vegetation recovery from the severe droughts of the 1980s, as preliminary analysis indicate an increase in rainfall during this period. This study includes an analysis of spatial and temporal trends of vegetation, covering the years 1982-2002, for areas in the western, eastern and central parts of the African Sahel in order to try to verify and explain the observed increasing trends in NDVI. By implementing two change detection techniques, visual interpretation and change vector analysis of high resolution satellite sensor data, it was observed that vegetation patterns differed, with recent year satellite imagery showing higher amounts of vegetation. It was, however, observed through comparison of phenological activity between the years of the acquired imagery that seasonal differences exist, most probably due to different climatic conditions preceding the recordings. Linear trend regressions of NOAA NDVI and rainfall data was analysed, and separately show increasing trends. The relationship between these two was also established by regression. The observed recent trends in vegetation activity cannot entirely be explained by increasing rainfall but rather as a combination of driving forces." @default.
- W2117291451 created "2016-06-24" @default.
- W2117291451 creator A5039517115 @default.
- W2117291451 date "2004-01-01" @default.
- W2117291451 modified "2023-10-16" @default.
- W2117291451 title "Investigating vegetation changes in the African Sahel 1982-2002: a comparative analysis using Landsat, MODIS and AVHRR remote sensing data" @default.
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