%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Mangiarotti, Sylvain
%A Drapeau, Laurent
%A Letellier, C.
%T Two chaotic global models for cereal crops cycles observed from satellite in northern Morocco
%D 2014
%L fdi:010062322
%G ENG
%J Chaos
%@ 1054-1500
%K MAROC
%M ISI:000338668900032
%N 2
%P art. 023130
%R 10.1063/1.4882376
%U https://www.documentation.ird.fr/hor/fdi:010062322
%> https://www.documentation.ird.fr/intranet/publi/2014/08/010062322.pdf
%V 24
%W Horizon (IRD)
%X 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.
%$ 126 ; 020