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Table 4 Salinity information of 41 samples, among which 29 (~ 70%) samples are used for training and 12 (~ 30%) samples highlighted in gray color are used for validation

From: 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

No. Code X (UTM WGS84_Zone48) (m) Y (UTM WGS84_Zone48) (m) Electrical conductivity (d/Sm) Elevation (meter) Soil types
1 L.01 649531 1098282 0.05 0 Sand dunes’ soil
2 P4N 654372 1081554 0.10 0 Sand dunes’ soil
3 P5N 653173 1081562 0.21 0 Less salty soil
4 P8 659690 1089314 0.22 0 Less salty soil
5 MP06 634243 1092238 0.30 6 Alluvial soil has yellowish reddish layer
6 MP01 650832 1097403 0.31 6 Less salty soil
7 MP05 640473 1095595 0.35 5 Alluvial soil has yellowish reddish layer
8 P2N 656426 1070927 0.36 0 Salty soil average
9 P7N 658718 1082446 0.37 0 Sand dunes’ soil
10 MP13 644985 1078898 0.42 2 Less salty soil
11 MP08 630202 1085956 0.45 2 Alluvial soil has yellowish reddish layer
12 P5N2 653218 1081402 0.45 0 Less salty soil
13 MP11 638932 1083668 0.48 3 Less salty soil
14 L.02 651590 1094664 0.51 3 Deep alkaline soils, saline soil average
15 MP02 650585 1099018 0.57 3 Less salty soil
16 P9-2 664137 1085331 0.60 0 Salty soil average
17 MP10 632954 1077177 0.62 3 Less salty soil
18 P10 664207 1082773 0.62 0 Salty soil
19 L.06 652801 1092571 0.63 3 Deep alkaline soils, saline soil average
20 MP03 649479 1100892 0.64 3 Less salty soil
21 P2N2 656415 1070929 0.64 0 Salty soil average
22 MP07 629148 1096882 0.69 1 Alluvial soil has yellowish reddish layer
23 MP14 647257 1071374 0.73 1 Salty soil under mangrove forest
24 MP04 648527 1100904 0.75 4 Less salty soil
25 L.03 651590 1094664 0.75 3 Deep alkaline soils, saline soil average
26 L.05 654466 1092021 0.80 3 Less salty soil
27 L.04 654689 1095002 0.83 3 Potential of deep alkaline soil, saline soil average
28 P9 664121 1085370 1.46   Soil disturbance by cultivation
29 L.07 654726 1087204 1.60   Sand dunes’ soil
30 P3N 657943 1076231 3.01   Less salty soil
31 L.13 654128 1061941 3.45   Salty soil
32 P12 661696 1069167 3.65   Salty soil
33 L11 N 664955 1072706 3.88   Salty soil average
34 P13 652229 1066825 4.36   Less salty soil
35 L.12 662432 1063649 4.66   Salty soil
36 L.14 649923 1061131 5.19   Salty soil under mangrove forest
37 L.11 662631 1058792 5.26   Soil disturbance by cultivation
38 L.15 646814 1062193 5.36   Soil disturbance by cultivation
39 L.10 669545 1062763 7.53   Potential of shallow alkaline soil, under mangrove forest
40 L.08 667320 1069881 8.20   Potential of shallow alkaline soil, under mangrove forest
41 L.09 671460 1068779 9.31   Potential of shallow alkaline soil, under mangrove forest