Agriculture Reference
In-Depth Information
0
100
transmittance
20
80
40
60
absorbance
60
40
80
20
reflectance
100
0
500
1000
1500
2000
2500
wavelength in nanometers
visible
near-infrared
short-wave infrared
Fig. 6.1
Reflectance and transmittance spectra of wheat leaves (variety: Talent) in the visible and
infrared range. The
shaded part
is the absorbance. The latter plus the reflectance and transmittance
add up to respectively 100 % (From Guyot
1998
, altered)
carotenoid-
and
chlorophyll
absorption
sparse absorption
by plants, thus
high reflectance
from them
absorption of
liquid water
40
35
30
25
20
15
10
red edge
5
veget.
0
blue
green
red
near-infrared
shortwave-infrared
300
400
500
600
700
800
900
1000
1500
2000
2500
wavelength in nm (
scale changes at 1000 nm
)
Fig. 6.2
Reflectance spectra of vegetation and soil in the visible-, near-infrared and shortwave-
infrared range (From Jensen
2007
, altered)
