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This paper shows the relationship between vegetation indices (MODIS NDVI and LAI) and Rainfall data collected in three different regions of Rwanda from 2003 to 2007. There are two peaks of interannual variability in MODIS NDVI, with vegetation greenness increases from early March to mid-May and from late August to mid-November. The experimental results clearly show the positive linear relationship between rainfall and MODIS NDVI-LAI from the beginning of the year until end of May. The NDVI-LAI has a positive relationship with rainfall; in summer with less rainfall, NDVI and LAI gradually decrease in three regions over Rwanda. The relationship of MODIS NDVI and rainfall is almost higher than that of LAI and rainfall in three regions in Rwanda. The relationship is stronger when time lag increases as the 2-month lag and 3-month lag show the highest relationship in the three regions in Rwanda.
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La et al. (2013) studied this question.
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