P. Santos et Aj. Negri, A COMPARISON OF THE NORMALIZED DIFFERENCE VEGETATION INDEX AND RAINFALL FOR THE AMAZON AND NORTHEASTERN BRAZIL, Journal of applied meteorology, 36(7), 1997, pp. 958-965
This paper presents a comparison of the normalized difference vegetati
on index (NDVI! and rainfall for the Amazon and northeastern Brazil fo
r the time period of 1988-90. The analysis shows that the NDVI and rai
nfall are uncorrelated in the Amazon, except in the northernmost part,
where the rainfall regime is drier and a savanna type of vegetation i
s present. In the drier region of northeastern Brazil, the relationshi
p is exponential, with the NDVI showing sensitivity to rainfall within
a regime of less than approximately 100 mm per month of rainfall.