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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)