MODIS Estimate of Canopy Water Content Susan L. Ustin University of California Davis July 14, 2004.
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Transcript of MODIS Estimate of Canopy Water Content Susan L. Ustin University of California Davis July 14, 2004.
![Page 1: MODIS Estimate of Canopy Water Content Susan L. Ustin University of California Davis July 14, 2004.](https://reader036.fdocuments.us/reader036/viewer/2022062519/5697bfbe1a28abf838ca25de/html5/thumbnails/1.jpg)
MODIS Estimate of
Canopy Water Content
Susan L. UstinUniversity of California Davis
July 14, 2004
![Page 2: MODIS Estimate of Canopy Water Content Susan L. Ustin University of California Davis July 14, 2004.](https://reader036.fdocuments.us/reader036/viewer/2022062519/5697bfbe1a28abf838ca25de/html5/thumbnails/2.jpg)
(Ustin et al., 1999)AVIRIS Composite 980 nm Water Absoroption
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Cw/LAI Estimation from MODIS
0
0.1
0.2
0.3
0.4
0.5
0.6
400 900 1400 1900 2400
W ave le ngth (nm )
Ref
lect
ance
cw=0.001 cw=0.002 cw=0.003 cw=0.01
cw=0.015 cw=0.02 cw=0.03
cw=0.001
cw=0.03
Band4R858.5nm
Band5R1240nm
MODIS Water Index (SRWI):
1240
858SRWI
R
R
(Pablo Zarco-Tejada et al., 2001 IEEE; Rem. Sens. Env. 2003)
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y = 0.04x - 0.0208R2 = 0.7238
0.00
0.01
0.02
0.03
0.04
0 0.5 1 1.5 2
Leaf (fw-dw)/dw
Est
ima
ted
Cw
(cm
)y = 0.0173x - 0.0095
R2 = 0.7772
0.00
0.01
0.02
0.03
0.04
0 0.5 1 1.5 2 2.5
Leaf (fw-dw)/dw
Est
ima
ted
Cw
(cm
)
y = 1.3355x - 0.0124R2 = 0.7183
0.00
0.01
0.02
0.03
0.04
0 0.01 0.02 0.03 0.04 0.05
Leaf [(fw-dw)/dw]*LHSAV
Est
ima
ted
Cw
(cm
)
y = 1.1134x - 0.0088R2 = 0.8644
0.000
0.005
0.010
0.015
0.020
0 0.01 0.02 0.03
Tim e Averaged [(fw-dw)/dw]*LHSAV
Est
ima
ted
Cw
(cm
)
Comparison between Field Measured Water Content VS. MODIS Prediction
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Water Content estimation from MOD09A1: seasonal variation
Cw=0.03
Cw=0.02
Cw=0.01
Cw=0
(Zarco-Tejada et al., 2003 Rem. Sens. Env.)
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Canopy water content in Southern California VegetationMeasured by MODIS Satellite
Seasonal Drought and Wildfire Potential
+
_
H2O
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Canopy Water Content
• Estimates of LAI
• Estimates of Plant Water Stress
• Estimates of Wildfire Fuel Moisture Content
![Page 8: MODIS Estimate of Canopy Water Content Susan L. Ustin University of California Davis July 14, 2004.](https://reader036.fdocuments.us/reader036/viewer/2022062519/5697bfbe1a28abf838ca25de/html5/thumbnails/8.jpg)
Roberts et al., Ecosystems 2004
LAI Estimated by NDVI VS EWT
Wind River Ameriflux Site
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Wisconsin Tall Tower Flux Site
S.N. Burrows et al.Ecosystems 2002
MODIS Data 2000-2001
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0
2
4
6
8
10
12
14
1 5 9 13 17 21 25 29 33 37 41 45 49 53 57
Week Number
LA
IModel1
MODIS
Model2
Estimate of LAI from MODIS Water Content vs. MOD09A1
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San Francisco
Los Angeles
1-980 CR AVIRIS Image
Estimating Water StressFrom Water Content
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1-CR Ratio (899-1060 nm) vs. Time
0.00
0.01
0.02
0.03
0.04
0.05
0.06
8/25/99 8/30/99 9/4/99 9/9/99 9/14/99 9/19/99 9/24/99 9/29/99
Date of Year 1999
1-98
0 C
ontin
uum
Rem
oval
l
Changes in Canopy Water Content after Irrigation Cutoff
+ Water
- Water
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Within Field Water Content vs.Days Since Last Irrigation
y = -469.4x + 54.649
R2 = 0.3251
0
2
4
6
8
10
12
14
16
18
0.08 0.085 0.09 0.095 0.1 0.105 0.11 0.115 0.12
1-980 Value
Days
Sin
ce L
ast I
rriga
tion
y = -409.06x + 51.855
R2 = 0.8128
0
2
4
6
8
10
12
14
16
18
0.08 0.085 0.09 0.095 0.1 0.105 0.11 0.115 0.12 0.125
1-980 CR
Days
Sin
ce L
ast I
rriga
tion
Pima Fields Only Acala Fields Only
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Estimating Fuel Moisture Content
■ Dry Matter in Fresh Samples
y = 0.8308x + 0.0009
R2 = 0.342
0.00
0.01
0.01
0.02
0.02
0.03
0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016
Inv-PROSPECT Dry matter (g/cm2)
Mea
sure
d D
ry m
atte
r fr
om f
resh
sam
ples
(g
/cm
2 )
Stephane Jacquemoud et al, 1996
P-value<0.0001
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Estimates of Fuel Moisture Content■ dry matter estimated seasonally
■ water content from Water Index
0
50
100
150
200
250
300
96 112
128
144
160
176
192
208
224
240
256
272
Day of the year
FM
C
0
0.5
1
1.5
Fu
nct
ion
of
Da
y
Cistus
Grassland
Func-cistus
Func-grass
Emilio Chuvieco et al., in press