Date post: | 31-Mar-2015 |
Category: |
Documents |
Upload: | penelope-bowsher |
View: | 213 times |
Download: | 1 times |
SMOS validation sites:Goulburn & Murrumbidgee
Cecilia Azcurra
Supervisor: Jeff Walker
Background
The SMOS satellite will be the first dedicated to the measurement of soil moisture Will measure soil moisture on a 50 x 50 km scale
Ground-based measurements to be used for calibration and validation of soil moisture derived from SMOS
SMOS validation sites are being identified world-wide Australian validation sites will cover a semi-arid
climate
SMOS validation
There is a discrepancy between the scale of SMOS measurements and that of the ground-based (point) measurements
Heterogeneous land cover is an issue Other issues include urban areas and standing
water Sampling needs to represent the soil
moisture over SMOS-sized pixels How many point measurements are required to
obtain the spatial average?
The study areas
Goulburn catchment
Goulburn catchment study area
Oct-31
Goulburn catchment data
Goulburn catchment dataOct-31
0
0.1
0.2
0.3
0.4
0.5
0.6
12 AM 3 AM 6 AM 9 AM 12 PM 3 PM 6 PM 9 PM 12 AM
Vol
um
etr
ic s
oil m
ois
ture
(v/
v)
K3 M2 M3 M5 M6 S1 S3 S4 S5 S6 S7
Oct-31, Station M5
0
0.1
0.2
0.3
0.4
0.5
0.6
12 AM 3 AM 6 AM 9 AM 12 PM 3 PM 6 PM 9 PM 12 AM
Vo
lum
etr
ic s
oil
mo
istu
re (
v/v)
0
5
10
15
20
25
Ra
infa
ll (m
m)
Hydraprobe (0-5cm) Cumulative Rainfall
Goulburn catchment dataNov-07
0
0.1
0.2
0.3
0.4
0.5
0.6
12 AM 3 AM 6 AM 9 AM 12 PM 3 PM 6 PM 9 PM 12 AM
Vol
umet
ric s
oil m
oist
ure
(v/v
)
K3 M2 M3 M5 M6 S1 S3 S4 S5 S6 S7
Nov-14
0
0.1
0.2
0.3
0.4
0.5
0.6
12 AM 3 AM 6 AM 9 AM 12 PM 3 PM 6 PM 9 PM 12 AM
Vol
umet
ric s
oil m
oist
ure
(v/v
)
K3 M2 M3 M5 M6 S1 S3 S4 S5 S6 S7
Nov-21
0
0.1
0.2
0.3
0.4
0.5
0.6
12 AM 3 AM 6 AM 9 AM 12 PM 3 PM 6 PM 9 PM 12 AM
Vol
umet
ric s
oil m
oist
ure
(v/v
)
K1 K3 M3 M5 M6 S1 S3 S4 S5 S6 S7
Yanco region
Soil moisture from air measurements Over 11 days
12 Monitoring stations
Kyeamba Creek
Soil moisture from air measurements Over 3 days
Regional sampling 14 Monitoring stations
General approach
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
31-Oct7-Nov
14-Nov21-Nov
Vol
umet
ric s
oil m
oist
ure
(v/v
)
-0.10
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
0.08
0.10
Diff
eren
ce w
ith a
irbor
ne s
oil m
oist
ure
(v/v
)
PLMR Difference (regional samping)
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
31-Oct7-Nov
14-Nov21-Nov
Vol
umet
ric s
oil m
oist
ure
(v/v
)
-0.10
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
0.08
0.10
Diff
eren
ce w
ith a
irbor
ne s
oil m
oist
ure
(v/v
)
PLMR Difference (regional samping) Difference (monitoring stations)
Preliminary results – Goulburn catchment
RMSE (regional) = 0.0275 v/v
RMSE (monitoring stations) = 0.0571 v/v
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
30-Oct1-Nov
3-Nov5-Nov
7-Nov9-Nov
11-Nov13-Nov
15-Nov17-Nov
19-Nov
Vol
umet
ric s
oil m
oist
ure
(v/v
)
-0.10
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
0.08
0.10
Diff
eren
ce w
ith a
irbor
n so
il m
oist
ure
(v/v
)
PLMR Difference (monitoring stations)
Preliminary results – Yanco region
RMSE = 0.0359 v/v
Next steps
Regional sampling data For Goulburn catchment Re-sampling to determine the number of samples
required to determine the spatial mean Monitoring stations
Identify which stations are representative of the area
Bootstrap sampling - Goulburn catchment
Oct
-31
Nov
-07
Nov
-14
Nov
-21
Preliminary results - Goulburn catchment
Soil moisture measurement type
From air Regional samplingMonitoring stations
(6am to 10am average)
DateSoil
moisture
(% v/v)
Soil moisture
(% v/v)
Error
(% v/v)
Soil moisture
(% v/v)
Error
(% v/v)
31-Oct-0546.23 47.54 1.31 38.20 -8.03
07-Nov-0537.80 36.41 -1.39 32.50 -5.30
14-Nov-0517.84 18.57 0.73 19.33 1.49
21-Nov-0516.12 11.01 -5.11 10.15 -5.97
Preliminary results - Yanco region
Air Monitoring Stations
SM (% v/v) SM (% v/v) Error (% v/v)
31-Oct-06 4.36 5.07 0.71
02-Nov-06 2.76 4.76 2.00
03-Nov-06 16.59 13.26 -3.33
04-Nov-06 11.02 11.60 0.58
05-Nov-06 6.48 9.57 3.09
07-Nov-06 4.18 6.90 2.72
09-Nov-06 3.82 6.23 2.41
13-Nov-06 19.20 23.25 4.05
14-Nov-06 11.33 17.58 6.25
16-Nov-06 10.46 14.38 3.92
18-Nov-06 5.41 11.11 5.70