Remote Sensing of Soil Moisture
8~-----------------------'
:r: 2
:r:
o 0
I
0_2
E
0>
(fj-6
o
d' _ 0.13 StoiCS - 5.25 (ra O.5)
10
20
30
40
50
SMCv(O-5cm) (~).
(0)
2.-----------------------,
,,-.. 0
ro
~ -2
:r:
:r:
o -
I
o
E
'~-1
(f)
-12
d'. 0.18 StoiCS - 10.5 (raO.78)
10
20
30
40
50
SMCv(O-5cm) (~)
(b)
391
Figure 14.19: aD as a function of SMCv measured with (a) the DUTSCAT scatterometer at
L-band (HH pol. and () = 1 (J' ) and with (b) the ERASME at C-band (HH pol., () = 15"). Letters
refer to crop type (A = alfalfa, B = bare soil, C = com, S = sunflower, W = wheat) and figures
to overflight number (after Coppo et al., 1990).
3
2
SAR CONFIGURATION
0 . 20' B. 45·
m
HH Polarization
~
"
0
i
·1
'" § ·2
· r ·3
. .
:c
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...
i! ·5
&1
·6
reM 11rUCtU,. efled
·7
0". B. 45"
-
:!an . Hr . 8cm
·8 0
10
20
30
40
50
Volumetric soil moislure MY (%0)
Figure 14.20: Radar backscatter vs. volumetric SMC and simulated backscatter variations due
to surface conditions in spring in RADARSAT configuration (after Beaudoin et al., 1990).