Land use/land cover changes and flooding surface estimation in Alqueva (Portugal) using 18 years of Landsat data

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2011

Autores

Ana Teodoro (Autor) FCUP; Sofia Rios (Autor) Outra; Dário Ferreira (Autor) Outra

Ata de Conferência Internacional

Título: EARTH RESOURCES AND ENVIRONMENTAL REMOTE SENSING/GIS APPLICATIONS II

Conference on Earth Resources and Environmental Remote Sensing/GIS Applications II

Prague, CZECH REPUBLIC, SEP 20-22, 2011

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 1 Citação

Outras Informações

ID Authenticus: P-002-YC1

DOI: 10.1117/12.897517

Abstract (EN): Alqueva dam was projected for the gorge of Guadiana River (Portugal) and resulted in the creation of the Europe's largest artificial lake with a flooding surface of 25,000 ha. Landsat imagery can be used for detecting terrestrial land cover conditions. In this work, 18 years of Landsat data, covering the period between 1992-2009 were used. The land use/land cover rates and flooding surface estimation were based on image classification algorithms (pixel-based and object-oriented approaches). The Landsat images are all from April and were already geometrically corrected. The selection of land-use classes is based on the Corine land cover nomenclature. In the pixel-based classification three supervised classification algorithms were applied to the dataset. The pixel-based classification algorithms presents a very good performance, demonstrated by the results of the overall accuracy (>91.55%) and Kappa statistics (>0.90). In the object-oriented approach, the region growing segmentation method was applied followed by the unsupervised Mahalanobis classification algorithm. Lastly, an estimation of the flooding surface was performed and land cover/land use maps were produced. GIS techniques were also used to quantify the land/use change rates and to compute the flooding surface increase (14,000 ha in 1992 and 23,000 ha in 2009).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12