Laboratoire de recherche Ressources Naturelles et Aménagement, Département d’aménagement des territoires, Faculté des sciences de la terre, Université de Badji Mokhtar, Annaba, Algeria
The present study aims to map areas vulnerable to water erosion by the PAP / RAC method using remote sensing and geographic information systems at the level of the Oued Bouhamdane watershed. The qualitative estimate of water erosion by the PAP / RAC method in this watershed provides a synthetic map of the distribution of erosive states, with 54, 73 % of the total area of the watershed subject to a degree of high and very high erosion. This result shows the value of using remote sensing technology and GIS in the assessment of vulnerability to erosion in watersheds.
In recent years, areas of vegetation and farmland in peripheral areas of the city of Guelma have declined in relation to urban sprawl and gradual subdivision of soils for construction purposes. In this context, it is necessary today to map these areas that play an important role in urban development and environmental quality. The objective of this study is the application of remote sensing indices to map the built-up lands and bare soil in the city of Guelma from the satellite image of the Landsat 8 program of 23 July 2018.The present study is based on bare soil and urban land indexes such as: NDBI, EBBI, UI and NDBaI. The result obtained shows that the NDBI index presents an acceptable result for mapping urban land and bare soil. This method can be used to monitor land use in the city of Guelma.
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