http://www.cnr.it/ontology/cnr/individuo/prodotto/ID207701

Land-use and land-cover change detection in a semi-arid area of Niger using multi-temporal analysis of Landsat images (Articolo in rivista)

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Land-use and land-cover change detection in a semi-arid area of Niger using multi-temporal analysis of Landsat images (Articolo in rivista) (literal)

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Nutini F., Boschetti M., P.A. Brivio, S. Bocchi., M. Antoninetti (2013)
Land-use and land-cover change detection in a semi-arid area of Niger using multi-temporal analysis of Landsat images
in International journal of remote sensing (Online); TAYLOR & FRANCIS LTD, London (Regno Unito)
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Nutini F., Boschetti M., P.A. Brivio, M. Antoninetti: CNR-IREA; Bocchi S. : Dip. Scienze Agrarie e Ambientali, Università degli Studi di Milano (literal)

Titolo

Land-use and land-cover change detection in a semi-arid area of Niger using multi-temporal analysis of Landsat images (literal)

Abstract

Recent studies using low-resolution satellite time series show that the Sahelian belt of West Africa is witnessing an increase in vegetation cover/biomass, called re-greening. However, detailed information on local processing and changes is rare or lacking. A multi-temporal set of Landsat images was used to produce land-cover maps for the years 2000 and 2007 in a semi-arid region of Niger, where an anomalous vegetation trend was previously detected. Several supervised classification approaches were tested: spectral classification of single Landsat data, temporal classification of normalized difference vegetation index time series from Landsat images, and two-step classification integrating both these approaches. The accuracy of the land-cover maps obtained ranges between 80% and 90% overall for the two-step classification approach. Comparison of the maps between the two years indicates a stable semi-arid region, where some change in hot spots exists despite a generally constant level of rainfall in the area during this period. In particular, the Dallol Bosso fossil valley highlights an increase in cultivated land, while a decrease in herbaceous vegetation was observed outside the valley where rangeland is the predominant natural landscape (literal)

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