Fig. 4From: Soil salinity assessment by using near-infrared channel and Vegetation Soil Salinity Index derived from Landsat 8 OLI data: a case study in the Tra Vinh Province, Mekong Delta, VietnamFour photos show soil samples taken at different soil types on 13 February 2017 under sunshine condition. Detail characteristics of each point are described as follows: a MP01 is paddy rice field after harvest with 6 m elevation; ,b L11 is of former use for aquaculture for shrimp at 5 m elevation; c MP05 is land use to grow banana surrounded by paddy field at 5 m elevation; and d P9 is paddy rice field at harvest time at 3 m elevationBack to article page