Table 2 PWV estimation at different spatial resolutions, frame rates and selection window widths

I. Influence of frame rates 

147

50 OV

1/33

1.50

0.13

0.77

3.6

147

100 OV

1/33

2.00

0.06

0.97

3.6

147

200 OV (LS/HT)

1/33

2.44

0.10

0.93

3.6

II. Influence of window widths

100

20 (HS/LT)

1/20

2.40

0.28

0.59

4.8

100

30

1/30

2.05

0.15

0.77

7.2

100

40

1/40

2.30

0.11

0.89

9.6

100

50

1/50

1.85

0.49

0.21

12.0

100

60*

1/60

–

–

–

14.4

100

60 OV

1/20

1.66

0.16

0.68

4.8

III. Influence of spatial resolution

100

200 OV

1/33

2.52

0.18

0.78

7.8

125

200 OV

1/33

2.20

0.08

0.93

5.0