{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T13:16:56Z","timestamp":1773667016702,"version":"3.50.1"},"reference-count":29,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2016,12,2]],"date-time":"2016-12-02T00:00:00Z","timestamp":1480636800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>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\u2019s 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\u2019 behavior, leading to an increase in the prevalence of bare soils during dry years.<\/jats:p>","DOI":"10.3390\/rs8120992","type":"journal-article","created":{"date-parts":[[2016,12,2]],"date-time":"2016-12-02T10:36:37Z","timestamp":1480674997000},"page":"992","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["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"],"prefix":"10.3390","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6141-8222","authenticated-orcid":false,"given":"Mehrez","family":"Zribi","sequence":"first","affiliation":[{"name":"CESBIO-Centre d\u2019\u00c9tudes Spatiales de la BIOsph\u00e8re, Universit\u00e9 de Toulouse, CNES\/CNRS\/IRD\/UPS, 18 avenue, Edouard Belin, bpi 2801, 31401 Toulouse CEDEX 9, France"}]},{"given":"Ghofrane","family":"Dridi","sequence":"additional","affiliation":[{"name":"CARTEL, D\u00e9partement de g\u00e9omatique appliqu\u00e9e, Universit\u00e9 de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada"}]},{"given":"Rim","family":"Amri","sequence":"additional","affiliation":[{"name":"CESBIO-Centre d\u2019\u00c9tudes Spatiales de la BIOsph\u00e8re, Universit\u00e9 de Toulouse, CNES\/CNRS\/IRD\/UPS, 18 avenue, Edouard Belin, bpi 2801, 31401 Toulouse CEDEX 9, France"},{"name":"Universit\u00e9 de Carthage\/INAT, 43, Avenue Charles Nicolle, 1082 Tunis-Mahraj\u00e8ne, Tunisia"}]},{"given":"Zohra","family":"Lili-Chabaane","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Carthage\/INAT, 43, Avenue Charles Nicolle, 1082 Tunis-Mahraj\u00e8ne, Tunisia"}]}],"member":"1968","published-online":{"date-parts":[[2016,12,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1149","DOI":"10.1175\/1520-0477-83.8.1149","article-title":"A review of twentieth-century drought indices used in the United States","volume":"84","author":"Heim","year":"2002","journal-title":"Bull. 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