Example of a results file: LAI
This is an annotated example of a results
file for LAI, as obtained with the 'full results' option.
GENERAL DESCRIPTION:
picture D:\Examples\Alptal2019-2-34.jpg name of the file
size (WxHxBPP) 2432 2432 24 width, height and bits per pixel
site Alptal name of the site
lens Sigma 4.5mm name of the camera lens
angle (°) 90 field of view in degrees
coefficients 0.9192 -0.1792 -0.00044 0.0 0.0 lens geometry
slope (°) 13
aspect (°) 275
threshold 196 (auto, N. & H. (2005)) threshold (here automatic, according
gamma 2.2 to Nobis & Hunziker with γ=2.2
chanels 33%R+33%G+34% red, green and blue channels
rings (Nx°) 5 15.0 5 rings, covering each 15 degrees
sectors (NxM) 12 3 12 azimutal sectors, grouped by 3
leaf angle 35° - 70° leaf angle limited between 35 and 70°
RESULTS PER RING:
ring angle ignored white black transm. correc. contact gaps omega width
1 10.0 0 15427 225450 .06405 .06429 2.703 0.0358 0.807 8.8
2 23.3 0 96648 626412 .13367 .13432 1.843 0.0322 0.922 9.3
3 38.0 0 244601 920779 .20989 .21244 1.221 0.1616 0.652 7.4
4 52.9 0 252863 1262517 .16686 .16805 1.077 0.1000 0.765 7.6
5 67.8 9129 124488 1593251 .07247 .05137 1.123 0.0412 0.799 8.7
angle = average zenith angle in the ring
transm. = transmission (total gap fraction within the defined rings)
correc. = transmission corrected after Schleppi et al. (2007)
contact = contact number based on the corrected transmission
gaps = proportion of large gaps estimated according to Chen & Cihlar (1995)
omega = Ω value of canopy clumping after Chen & Cihlar (1995)
width = foliar element width calculated for Chen & Cihlar (1995)
RESULTS PER RING AND SECTOR:
ring sector azimut ignored white black transm. contact
1 1 095.0 0 972 19092 .04844 2.722
1 2 125.0 0 9928 10151 .49445 0.638
(...)
5 11 035.0 0 424 143476 .00295 1.402
5 12 065.0 490 869 142544 .00606 0.760
TOTALS:
white 734027 white pixels (sky)
black 4628409 black pixels (canopy)
ignored 9129 pixels ignored
transmission 13.4% light transmission in 2D (azimutal equidistant projection of the hemisphere)
gaps 7.80% ... of which large gaps
openness 13.6% canopy openness in 3D, also called sky view factor (solid angles of the hemisphere)
gaps 8.21% ... of which large gaps
LEAF AREA INDEX:
corrections - S. & al. (2007) W. & T. (2000) L. & X. (1986) C. & C. (1995) S.& al.+ C.& C.
--------------- --------------- --------------- --------------- --------------- --------------- ---------------
methods LAI angle LAI angle LAI angle LAI angle LAI angle LAI angle
--------------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- -------
Miller (1967) 2.53 - 2.60 - 3.72 - 3.24 - 3.26 - 3.35 -
LiCor LAI2000 2.39 0 2.51 0 3.43 5 3.06 0 3.06 0 3.21 0
Lang (1987) 2.60 - 2.68 - 3.65 - 3.37 - 3.34 - 3.43 -
G. & al. (2018) 1.93 - 1.92 - 2.63 - 2.15 - 2.94 - 3.14 -
N. & C. (1989) 2.45 36 2.54 36 3.54 38 3.22 36 3.10 36 3.22 36
T. & al. (2010) 2.28 35 2.36 35 3.35 38 2.92 35 2.95 35 3.05 35
--------------- --------------- --------------- --------------- --------------- --------------- ---------------
angle = mean leaf angle (in degrees)
S. & al. = slope and non-linearity correction (Schleppi et al., 2007)
W. & T. = clumping correction (Walter & Torquebiau, 2000)
L. & X. = clumping correction (Lang & Xiang, 1986)
C. & C. = clumping correction (Chen & Cihlar, 1995)
G. & al. = robust regression (Gonsamo et al., 2018)
N. & C. = ellipsoidal method (Norman & Campbell, 1989)
T. & al. = weighted ellipsoidal method (Thimonier et al., 2010)
methods Fmv Frv Fmv Frv Fmv Frv Fmv Frv Fmv Frv Fmv Frv
--------------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- -------
N. & C. (1989) 16.0% - 14.9% - 16.0% 10.9% 16.0% 9.71% 16.0% 8.86% 14.9% 8.26%
T. & al. (2010) 17.8% - 16.8% - 17.8% 12.1% 17.8% 10.1% 17.8% 10.4% 16.8% 9.80%
--------------- --------------- --------------- --------------- --------------- --------------- ---------------
Fmv = transmission (total gap fraction) in vertical projection
Frv = fraction of large gaps in vertical projection