Mangiarotti Sylvain auteur aut IRD Drapeau Laurent auteur aut IRD Letellier C. auteur aut IRD text journalArticle eng text/pdf born digital access The dynamics underlying cereal crops in the northern region of Morocco is investigated using a global modelling technique applied to a vegetation index time series derived from satellite measurements, namely, the normalized difference vegetation index from 1982 to 2008. Two three-dimensional chaotic global models of reduced size (14-term and 15-term models) are obtained. The model validation is performed by comparing their horizons of predictability with those provided in previous studies. The attractors produced by the two global models have a complex foliated structure-evidenced in a Poincare section-rending a topological characterization difficult to perform. Thus, the Kaplan-Yorke dimension is estimated from the synthetic data produced by our global models. Our results suggest that cereal crops in the northern Morocco are governed by a weakly dissipative three-dimensional chaotic dynamics. specialized MAROC 126 020 24 2 art. 023130 2014 1054-1500 https://www.documentation.ird.fr/hor/fdi:010062322 10.1063/1.4882376 1054-1500 [F B010062322] https://www.documentation.ird.fr/hor/fdi:010062322 https://www.documentation.ird.fr/intranet/publi/2014/08/010062322.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2014-09-09 2022-10-24 fdi:010062322 fre