Ochieng, George M.Ojo, Olumuyiwa I.Otieno, Fredrick Alfred O.Mwaka, Beason2014-03-182014-03-1820132193-2697http://hdl.handle.net/10321/958Soil salinity is a critical environmental problem in many countries around the world especially the arid and semi-arid countries like South Africa. The problem has great impact on soil fertility which in turns has a great effect on soil productivity. This paper addresses the use of remote sensing and GIS in the assessment of salinity using Landsat enhanced thematic mapper plus (ETM+) data of the Vaal-Harts irrigation scheme acquired with other field data sets and a topographical map to show the spectral classes and salt-affected areas for the years under assessment (1991 to 2005).12 penGeographic information systemsRemote sensingVaal HartsSalinityNDVIRemote sensingSalinityGeographic information systemsArticlehttps://doi.org/10.1186/2193-2697-2-4