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Remote Sens. 2016, 8(12), 992; doi:10.3390/rs8120992

Analysis of the Effects of Drought on Vegetation Cover in a Mediterranean Region through the Use of SPOT-VGT and TERRA-MODIS Long Time Series

1
CESBIO-Centre d’Études Spatiales de la BIOsphère, Université de Toulouse, CNES/CNRS/IRD/UPS, 18 avenue, Edouard Belin, bpi 2801, 31401 Toulouse CEDEX 9, France
2
CARTEL, Département de géomatique appliquée, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
3
Université de Carthage/INAT, 43, Avenue Charles Nicolle, 1082 Tunis-Mahrajène, Tunisia
*
Author to whom correspondence should be addressed.
Academic Editors: Yuei-An Liou, Chyi-Tyi Lee, Yuriy Kuleshov, ean-Pierre Barriot, Chung-Ru Ho, Xiaofeng Li and Prasad S. Thenkabail
Received: 20 September 2016 / Revised: 15 November 2016 / Accepted: 28 November 2016 / Published: 2 December 2016
(This article belongs to the Special Issue Earth Observations for a Better Future Earth)
View Full-Text   |   Download PDF [9725 KB, uploaded 2 December 2016]   |  

Abstract

The analysis of vegetation dynamics and agricultural production is essential in semi-arid regions, in particular as a consequence of the frequent occurrence of periods of drought. In this paper, a multi-temporal series of the Normalized Difference of Vegetation Index (NDVI), derived from SPOT-VEGETATION (between September 1998 and August 2013) and TERRA-MODIS satellite data (between September 2000 and August 2013), was used to analyze the vegetation dynamics over the central region of Tunisia in North Africa, which is characterized by a semi-arid climate. Products derived from these two satellite sensors are generally found to be coherent. Our analysis of land use and NDVI anomalies, based on the Vegetation Anomaly Index (VAI), reveals a strong level of agreement between estimations made with the two satellites, but also some discrepancies related to the spatial resolution of these two products. The vegetation’s behavior is also analyzed during years affected by drought through the use of the Windowed Fourier Transform (WFT). Discussions of the dynamics of annual agricultural areas show that there is a combined effect between climate and farmers’ behavior, leading to an increase in the prevalence of bare soils during dry years. View Full-Text
Keywords: Vegetation Anomaly Index; North Africa; vegetation dynamics; agriculture Vegetation Anomaly Index; North Africa; vegetation dynamics; agriculture
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zribi, M.; Dridi, G.; Amri, R.; Lili-Chabaane, Z. Analysis of the Effects of Drought on Vegetation Cover in a Mediterranean Region through the Use of SPOT-VGT and TERRA-MODIS Long Time Series. Remote Sens. 2016, 8, 992.

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