Spearman correlations of all visibility related data
| Visual codes (slides) | bsp | Visual range | |||||||
| MISS | HOPE | CHIL | ABB | MMH | CHIL | CLBR | AIA | VIA | |
| MISS | 1 | ||||||||
| HOPE | 0.22
(145) |
1 | |||||||
| CHIL | 0.75
(262) |
0.29
(281) |
1 | ||||||
| ABB | 0.70
(130) |
0.08
(70) |
0.60
(159) |
1 | |||||
| MMH | 0.56
(86) |
0.16
(182) |
0.46
(191) |
- | 1 | ||||
| CHIL | 0.69
(83) |
0.22
(117) |
0.66
(125) |
0.45
(62) |
0.66
(54) |
1 | |||
| CLBR | 0.52
(159) |
0.15
(315) |
0.42
(301) |
0.51
(106) |
0.48
(210) |
0.73
(1796) |
1 | ||
| AIA | -0.17
(306) |
-0.01
(455) |
-0.19
(510) |
-0.12
(204) |
-0.44
(295) |
-0.27
(4806) |
-0.22
(7713) |
1 | |
| VIA | -0.57
(306) |
-0.14
(455) |
-0.48
(510) |
-0.43
(204) |
-0.59
(295) |
-0.38
(4801) |
-0.35
(7712) |
0.61
(11038) |
1 |
Notes:
Photographs were taken 3 times daily.
Site comparisons were only undertaken when the slide code was 1, 2, 3 or 4. Bscat data were only
when a QA code of 0 was assigned.
The distance to the visual targets differs from scene to scene.
Visual codes 1-4 indicate that camera operation and meteorological conditions were normal. A
code of 1 indicates the best visibility (i.e. that the farthest target is visible). A code of 4 indicates
worst visibility (i.e. that the nearest target is not visible).
Matching codes for visual code from the photographs and visual range extrapolated from the bscat measurements from the nephelometers.
| Abbotsford / Clearbrook | Chilliwack | ||||||
| Matching code | Matching code | ||||||
| 0 | 1 | 2 | 0 | 1 | 2 | ||
| visual code | 1 | 18 | 0 | 7 | 39 | 0 | 20 |
| 2 | 28 | 24 | 0 | 33 | 8 | 12 | |
| 3 | 5 | 22 | 0 | 6 | 3 | 1 | |
| 4 | 0 | 2 | 0 | 1 | 2 | 0 | |
Notes:
A matching code of 0 was assigned when the visual range extrapolated from the nephelometer
data was in the same range as that extrapolated from the slides. A code of 1 was assigned when
the visual range from the nephelometer indicated a category different than that extrapolated
from the slides and the visual range from the nephelometer indicted better visibility than the
estimate from the slides. A code of 2 was assigned when the visual range from the nephelometer
indicated a category different than that extrapolated from the slides and the visual range from
the nephelometer indicted worse visibility than the estimate from the slides.
Slides coded 5 which indicates unsuitable meteorological conditions were excluded from this
analysis, as were slides with visual codes of 0 and 6.
