The Normalized Difference Vegetation Index time series derived from NOAA satellite data relevant to the years 1986–1989 have been used to evaluate their usefulness for vegetation mapping purposes. Given the remote sensing information about all the available dates in a period, it is possible to define areas of homogeneous time NDVI profile through unsupervised classification procedures. In the discrimination process it is assumed that dynamic features of the vegetation with an evolution period shorter than one month can be neglected. Three different approaches are used: an unsupervised classification on Principal Components and on 6 and 12 months data.