Table 1 Number of Days with Cloud-free Observations.

From: Improved Characterisation of Vegetation and Land Surface Seasonal Dynamics in Central Japan with Himawari-8 Hypertemporal Data

Period

Site

Range (DOY)

Number of Days with Cloud-free Obs.

Percentage (%)

Frequency

Ratio

AHI

VIIRS

AHI

VIIRS

AHI

VIIRS

Pre-green-up

TKY

1–127

31

17

24

13

4.2

7.6

1.8

FHK

1–106

40

21.5

39

21

2.6

4.9

1.9

TGF

1–90

50

34.5

56

39

1.8

2.6

1.4

Green-up

TKY

128–152

6.5

4

27

16

3.8

6.1

1.6

FHK

107–138

5.5

3.5

17

11

6.0

9.5

1.6

TGF

91–135

10

5.5

23

13

4.4

7.9

1.8

Peak

TKY

153–275

14.5

7.5

12

6.2

8.5

19

1.9

FHK

139–281

4.5

1.5

3.2

1.1

35

106

3.0

TGF

136–240

10.5

2.5

10

2.4

11

43

4.2

Brown-down

TKY

276–322

15

10

32

22

3.1

4.7

1.5

FHK

282–332

17.5

11

34

22

3.1

4.6

1.6

TGF

241–330

24

18

29

21

3.5

4.7

1.4

Post-brown-down

TKY

323–365

8.5

7.5

20

17

5.1

5.8

1.1

FHK

333–365

22

15

68

48

1.5

2.1

1.4

TGF

331–365

24.5

18.5

70

53

1.4

1.9

1.3

  1. The percent values were calculated by dividing the number of days with cloud-free observations by the total number of days (with PEN sky images available), whereas the frequency values were obtained by dividing the latter by the former. The last column contains the ratio of the AHI percent value to that of VIIRS. All of values in the table are the average of the year 2016 and 2017 values (see Supplementary Table S3).
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