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Progress in Earth and Planetary Science
Fig. 1 | Progress in Earth and Planetary Science

Fig. 1

From: Comment on “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, Vietnam” by Kim-Anh Nguyen, Yuei-An Liou, Ha-Phuong Tran, Phi-Phung Hoang and Thanh-Hung Nguyen

Fig. 1

The upper left panel shows the study area: the yellow polygon indicates the coastal zone with ponds used for shrimp farming, which is magnified in the A panel; the B panel shows the freshwater area. Blue points in the A panel indicate the location of the grids created around the twelve sampling points provided by Nguyen et al. (2020); red points in the A panel indicate the location of the eight additional grids randomly generated; orange points in the B panel indicate the location of the grids created on freshwater ponds. The images of the grids of 10 × 10 cells (of 30 m × 30 m each) in the bottom right of the figure correspond to the grids created around point with ID 32 and around point with ID 36 overlaid on the most recent and on the historic Google Earth satellite images (see Table 1 for the exact dates of the images). Coordinate reference system: WGS84 UTM Zone 48. Maps were produced in QGIS and Google Earth Pro using Google Earth satellite images

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