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Table 1 Number of grid cells fully falling on water, land or mixed water/land

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

  ID G30 G31 G32 G33 G34 G35 G36 G37 G38 G39 G40 G41 R1 R2 R3 R4 R5 R6 R7 R8 Mean %
Recent images Water 0 2 15 0 5 2 6 2 1 5 3 0 1 0 13 2 3 6 5 4 3.75
  Land 12 7 0 0 3 2 0 34 25 17 10 2 6 28 18 5 1 5 17 2 9.7
  Mix 88 91 85 100 92 96 94 64 74 78 87 98 93 72 69 93 96 89 78 94 86.55
  Image date M18 M18 F18 D19 M18 D19 F18 D19 F18 D19 D19 F18 D19 D19 D19 D19 D19 D19 M18 D19  
Historical images Water 0 0 17 0 5 1 6 4 3 4 2 0 0 0 11 0 5 6 9 3 3.8
  Land 17 7 14 0 1 4 3 32 33 0 6 0 1 26 14 4 0 5 14 3 9.2
  Mix 83 93 69 100 94 95 91 64 64 96 92 100 99 74 75 96 95 89 77 94 87
  Image date J15 A14 J15 A14 A14 J15 M11 J15 J15 A14 A14 A14 A14 J15 J06 A14 A14 A14 J15 A14  
  1. Cells sum to 100 for each grid. G30 to G41 are grids created around the corresponding field points of Nguyen et al. (2020) (see IDs of Table 4). R1 to R8 are grids created around random points falling within the coastal ponded zone. Google Earth satellite images are used as base images. The first part of the table is produced using the recent base images (collected on December 2019, March 2018 and February 2018, reported in the table as D19, M18 and F18, respectively). The second part is produced using historical cloud-free base images collected before February 14, 2017 (collected on January 2015, August 2014, March 2011 and January 2006, reported in the table as J15, A14, M11 and J06, respectively)