R. Balaghi, B. Tychon, H. Eerens, and M. Jlibene, Empirical regression models using NDVI, rainfall and temperature data for the early prediction of wheat grain yields in Morocco, International Journal of Applied Earth Observation and Geoinformation, vol.10, issue.4, 2007.
DOI : 10.1016/j.jag.2006.12.001

P. Bergé, Y. Pomeau, and C. Vidal, Order within chaos: toward a deterministic approach to turbulence, 2004.

C. Diks, Nonlinear time series analysis, World Scientific, 1999.
DOI : 10.1142/3823

J. D. Farmer and J. Sidorowich, Predicting chaotic time series, Physical Review Letters, vol.59, issue.8, pp.845-848, 1987.
DOI : 10.1103/PhysRevLett.59.845

R. Fensholt and K. Rasmussen, Analysis of trends in the Sahelian ???rain-use efficiency??? using GIMMS NDVI, RFE and GPCP rainfall data, Remote Sensing of Environment, vol.115, issue.2, pp.438-451, 2011.
DOI : 10.1016/j.rse.2010.09.014

F. Frappart, P. Hiernaux, F. Guichard, E. Mougin, L. Kergoat et al., Rainfall regime across the Sahel band in the Gourma region, Mali, Journal of Hydrology, vol.375, issue.1-2, pp.128-142, 2009.
DOI : 10.1016/j.jhydrol.2009.03.007

A. M. Fraser and H. L. Swinney, Independent coordinates for strange attractors from mutual information, Physical Review A, vol.33, issue.2, pp.1134-1140, 1986.
DOI : 10.1103/PhysRevA.33.1134

P. Grassberger and I. Procaccia, Characterization of Strange Attractors, Physical Review Letters, vol.50, issue.5, pp.346-349, 1983.
DOI : 10.1103/PhysRevLett.50.346

S. M. Herrmann, A. Anyamba, and C. J. Tucker, Recent trends in vegetation dynamics in the African Sahel and their relationship to climate, Global Environmental Change, vol.15, issue.4, pp.394-404, 2005.
DOI : 10.1016/j.gloenvcha.2005.08.004

B. W. Heumann, J. W. Seaquist, L. Eklundh, and P. Jönsson, AVHRR derived phenological change in the Sahel and Soudan, pp.385-392, 1982.

B. N. Holben, Characteristics of maximum-value composite images from temporal AVHRR data, International Journal of Remote Sensing, vol.7, issue.11, pp.1435-1445, 1986.
DOI : 10.1016/0034-4257(83)90053-6

M. E. James and S. N. Kalluri, The Pathfinder AVHRR land data set: An improved coarse resolution data set for terrestrial monitoring, International Journal of Remote Sensing, vol.28, issue.17, pp.15-3347, 1994.
DOI : 10.1029/JC095iC05p07381

L. Jarlan, S. Mangiarotti, E. Mougin, P. Mazzega, P. Hiernaux et al., Assimilation of SPOT/VEGETATION NDVI data into a Sahelian vegetation growth model, pp.1381-1394, 2008.

C. O. Justice, B. L. Markham, J. R. Townshend, and R. L. Kennard, Spatial degradation of satellite data, International Journal of Remote Sensing, vol.51, issue.9, pp.1535-1561, 1989.
DOI : 10.1016/0034-4257(87)90015-0

M. B. Kennel and H. D. Abarbanel, False neighbors and false strands: A reliable minimum embedding dimension algorithm, Physical Review E, vol.66, issue.2, pp.1-18, 2002.
DOI : 10.1103/PhysRevE.66.026209

E. Lambin, Change detection at multiple temporal scales: seasonal and annual variations in landscape variables, Photogrammetric Engeneering & Remote Sensing, issue.8, pp.62-931, 1996.

T. Lebel and A. Amani, Rainfall Estimation in the Sahel: What Is the Ground Truth?, Journal of Applied Meteorology, vol.38, issue.5, pp.555-568, 1999.
DOI : 10.1175/1520-0450(1999)038<0555:REITSW>2.0.CO;2

C. Letellier, I. M. Moroz, and R. Gilmore, Comparison of tests for embeddings, Physical Review E, vol.78, issue.2, 2008.
DOI : 10.1103/PhysRevE.78.026203

S. Mangiarotti, P. Mazzega, L. Jarlan, E. Mougin, F. Baup et al., Evolutionary Bi-Objective Optimization of a semi-arid vegetation dynamics model with NDVI and ?0 Satellite data. Remote Sensing of Environment, pp.1365-1380, 2008.
URL : https://hal.archives-ouvertes.fr/hal-00293287

S. Mangiarotti, P. Mazzega, P. Hiernaux, and E. Mougin, The vegetation cycle in West Africa from AVHRR???NDVI data: Horizons of predictability versus spatial scales, Remote Sensing of Environment, vol.114, issue.9, 2010.
DOI : 10.1016/j.rse.2010.04.010

URL : https://hal.archives-ouvertes.fr/ird-01062699

F. Maselli, C. Conese, L. Petkov, and M. Gilabert, Use of NOAA-AVHRR NDVI data for environmental monitoring and crop forecasting in the Sahel. Preliminary results, International Journal of Remote Sensing, vol.19, issue.14, pp.2743-2749, 1080.
DOI : 10.1080/01431169108929717

J. Miks?vský and A. Raidl, Testing for nonlinearity in European climatic time series by the method of surrogate data, Theoretical and Applied Climatology, vol.8, issue.1-4, pp.21-33, 2006.
DOI : 10.1007/s00704-005-0130-7

E. Mougin and P. Hiernaux, The AMMA-CATCH Gourma observatory site in Mali: Relating climatic variations to changes in vegetation, surface hydrology, fluxes and natural resources, Journal of Hydrology, vol.375, issue.1-2, pp.14-33, 2009.
DOI : 10.1016/j.jhydrol.2009.06.045

URL : https://hal.archives-ouvertes.fr/hal-01063406

R. B. Myneni and D. L. Williams, On the relationships between FAPAR and NDVI. Remote Sensing of Environment, pp.200-211, 1994.

J. Pinzon, M. E. Brown, and C. J. Tucker, Satellite time series correction of orbital drift artifacts using empirical mode decomposition, Hilbert- Huang Transform: Introduction and Applications, pp.167-186, 2005.

S. W. Running and J. C. Coughlan, A general model of forest ecosystem processes for regional applications I. Hydrologic balance, canopy gas exchange and primary production processes, Ecological Modelling, vol.42, issue.2, pp.125-154, 1988.
DOI : 10.1016/0304-3800(88)90112-3

J. W. Seaquist, T. Hickler, L. Eklundh, J. Ard, and B. W. Heumann, Disentangling the effects of climate and people on Sahel vegetation dynamics, Biogeosciences, vol.6, issue.3, pp.469-477, 2009.
DOI : 10.5194/bg-6-469-2009

F. Takens, Detecting strange attractors in turbulence, Lecture Notes in Mathematics, vol.20, issue.1, pp.366-381, 1981.
DOI : 10.1007/BF01646553

C. J. Tucker, Red and photographic infrared linear combinations for monitoring vegetation, Remote Sensing of Environment, vol.8, issue.2, pp.127-150, 1979.
DOI : 10.1016/0034-4257(79)90013-0

C. J. Tucker, J. E. Pinzon, and M. E. Brown, Global Inventory Modeling and Mapping Studies, NA94apr15b.n11-VIg, 2.0, Global Land Cover Facility, 1994.

C. J. Tucker, J. E. Pinzon, M. E. Brown, D. A. Slayback, E. W. Pak et al., An extended AVHRR 8-km NDVI dataset compatible with MODIS and SPOT vegetation NDVI data, International Journal of Remote Sensing, vol.26, issue.20, pp.20-4485, 1080.
DOI : 10.1080/01431160500168686

A. Wolf, J. B. Swift, H. L. Swinney, and J. A. Vastano, Determining Lyapunov exponents from a time series, Physica D: Nonlinear Phenomena, vol.16, issue.3, pp.285-317, 1985.
DOI : 10.1016/0167-2789(85)90011-9

D. Yu, M. Small, R. G. Harrison, and C. Diks, Efficient implementation of the Gaussian kernel algorithm in estimating invariants and noise level from noisy time series data, Physical Review E, vol.61, issue.4, pp.61-3750, 2000.
DOI : 10.1103/PhysRevE.61.3750