savannas; tropical rain forests; teledetection; asie du sud est; farmland/land classification;
bosque tropical humedo; foret tropicale humide; tecnicas analiticas; terre
agricole/classification des terres; bresil; plante a feuilles caduques; utilizacion de la tierra;
variacion estacional; tierras agricolas/clasificacion de tierras; teledeteccion; variation
saisonniere

A signal processing technique is presented and applied to annual patterns of the Global
Vegetation Index (GVI) derived from the Advanced Very High Resolution Radiometer
(AVHRR) to examine the frequency distribution of the multi-temporal signal. It is shown that
frequencies of the signal are linked to integrated GVI, seasonal variability and subseasonal
variability of the land cover type. These characteristics are used to derive a land cover
classification.