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VEGETATION DATA. Viviana Maggioni Dr. Jeffrey Walker. The Vegetation Sampling. Regional Sampling 16 vegetation biomass samples at the 8 HI-RES areas (week 1 & 3) 6 vegetation biomass samples per farm every Monday at the same location - PowerPoint PPT Presentation
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VEGETATION DATA
Viviana
Maggioni
Dr. Jeffrey Walker
2nd NAFE Workshop
The Vegetation Sampling
• Regional Sampling 16 vegetation biomass samples at
the 8 HI-RES areas (week 1 & 3)
6 vegetation biomass samples per farm every Monday at the same location
measurements of NDVI, TIR, LAI at 16 points of the HI-RES areas (once per farm)
• Farm Scale Sampling 2 vegetation “grab” samples
at NW and SE corners of the HI-RES area
N
S
W E
Viviana Maggioni
2nd NAFE Workshop
Collected Data
• Vegetation Dry Biomass
• Vegetation Water Content
• Normalized Difference Vegetation Index (NDVI)
• Thermal Infra Red (TIR)
• Leaf Area Index (LAI)
Viviana Maggioni
2nd NAFE Workshop
Objective• VWC estimates to remotely sense VWC• Literature: T. Jackson et al. (2003)• How accurate do we need to know VWC for a
given accuracy of Moisture Content of 4%?
Viviana Maggioni
• extreme conditions: 0.8 kg/m²
• otherwise: 1 kg/m²
Saturation of the NDVI
NIR – SWIRNDWI
= NIR + SWIR
_____
Pembroke:• 80% Barley• 20% Native Grass
Stanley:• Native Grass
Illogan:• 60% Oats• 40% Barley
Roscommon:• Native Grass
Dales:• Native Grass
Midlothian:• 50% Fallow• 50% Lucerne
Cullingral:• 50% Wheat• 50% Barley
Merriwa Park:• Wheat
The High Resolution Focus Areas
N
2nd NAFE Workshop
Dry Biomass (kg/m²): Merriwa Area
0
0.5
1
1.5
4-NOV 7-NOV 14-NOV 21-NOV
CULLINGRALD
ry B
iom
ass
(kg
/m^2
)
0
0.5
1
1.5
2
2.5
3
31-OCT 7-NOV 14-NOV 21-NOV
DALES
Dry
Bio
mas
s (k
g/m
^2)
0.4
0.6
0.8
1
1.2
1.4
1.6
7-NOV 14-NOV 21-NOV
MERRIWA_PARK
Dry
Bio
mas
s (k
g/m
^2)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
31-OCT 7-NOV 14-NOV 21-NOV
MIDLOTHIAN
Dry
Bio
mas
s (k
g/m
^2)
Viviana Maggioni
2nd NAFE Workshop
0
0.5
1
1.5
31-OCT 14-NOV 21-NOV
ILLOGAND
ry B
iom
ass
(kg
/m^2
)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
31-OCT 7-NOV 14-NOV 21-NOV
PEMBROKE
Dry
Bio
mas
s (k
g/m
^2)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
31-OCT 7-NOV 14-NOV 21-NOV
ROSCOMMON
Dry
Bio
mas
s (k
g/m
^2)
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
3-NOV 7-NOV 14-NOV 21-NOV
STANLEY
Dry
Bio
mas
s (k
g/m
^2)
Dry Biomass (kg/m²): Krui Area
Viviana Maggioni
2nd NAFE Workshop
Vegetation Water Content (kg/m²): Merriwa Area
0
0.5
1
1.5
2
31-OCT 4-NOV 7-NOV 14-NOV 9-NOV 18-NOV 21-NOV 25-NOV
CULLINGRALV
WC
(kg
/m^2
)
0
0.2
0.4
0.6
0.8
1
1.2
31-OCT 7-NOV 14-NOV 18-NOV 21-NOV 25-NOV
DALES
VW
C (
kg/m
^2)
0
0.5
1
1.5
2
2.5
3
7-NOV 9-NOV 14-NOV 16-NOV 21-NOV 23-NOV
MERRIWA_PARK
VW
C (
kg/m
^2)
0
0.5
1
1.5
2
2.5
31-OCT 7-NOV 11-NOV 14-NOV 21-NOV 23-NOV
MIDLOTHIAN
VW
C (
kg/m
^2)
Viviana Maggioni
2nd NAFE Workshop
Vegetation Water Content (kg/m²): Krui Area
0
0.5
1
1.5
2
2.5
3
3.5
31-OCT 14-NOV 17-NOV 21-NOV 24-NOV
ILLOGANV
WC
(kg
/m^2
)
0
1
2
3
4
5
6
31-OCT 7-NOV 8-NOV 14-NOV 15-NOV 21-NOV 22-NOV
PEMBROKE
VW
C (
kg/m
^2)
0
0.5
1
1.5
2
2.5
31-OCT 7-OCT 8-NOV 14-NOV 15-NOV 21-NOV 22-NOV 24-NOV
ROSCOMMON
VW
C (
kg/m
^2)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
3-NOV 7-NOV 10-NOV 17-NOV 14-NOV 21-NOV 24-NOV
STANLEY
VW
C (
kg/m
^2)
Viviana Maggioni
2nd NAFE Workshop
NIR and RED
0
0.5
1
1.5
2
2.5
3
CU
LL
ING
RA
L
DA
LE
S
ME
RR
IWA
PA
RK
MID
LO
TH
IAN
ILL
OG
AN
PE
MB
RO
KE
RO
SC
OM
MO
N
ST
AN
LE
YNIR
NIR
0
0.2
0.4
0.6
0.8
1
1.2
CU
LL
ING
RA
L
DA
LE
S
ME
RR
IWA
PA
RK
MID
LO
TH
IAN
ILL
OG
AN
PE
MB
RO
KE
RO
SC
OM
MO
N
ST
AN
LE
Y
RED
RE
D
Viviana Maggioni
2nd NAFE Workshop
Normalized Difference Vegetation Index
0
0.2
0.4
0.6
0.8
1
CU
LL
ING
RA
L
MID
LO
TH
IAN
ME
RR
IWA
PA
RK
DA
LE
S
PE
MB
RO
KE
RO
SC
OM
MO
N
ST
AN
LE
Y
ILL
OG
AN
NDVI
ND
VI
NDVI =
NIR - RED
NIR + RED
Viviana Maggioni
2nd NAFE Workshop
0
0.5
1
1.5
2
2.5
3
3.5
4
CU
LL
ING
RA
L
DA
LE
S
ME
RR
IWA
PA
RK
MID
LO
TH
IAN
PE
MB
RO
KE
ST
AN
LE
Y
RO
SC
OM
MO
N
ILL
OG
AN
LAI
LA
I
20
25
30
35
40
45
50
55
60
CU
LL
ING
RA
L
DA
LE
S
ME
RR
IWA
PA
RK
ILL
OG
AN
PE
MB
RO
KE
RO
SC
OM
MO
N
ST
AN
LE
Y
TIR
TIR
TIR and LAI
Viviana Maggioni
2nd NAFE Workshop
MODIS NDVI Validation
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4 0.6 0.8 1
GROUND_SATELLITE NDVI
PEMBROKE
STANLEY
ROSCOMMON
ILLOGAN
DALES
MIDLOTHIAN
MERRIWA PARK
CULLINGRAL
GR
OU
ND
ND
VI
MODIS NDVI
Viviana Maggioni
2nd NAFE Workshop
0
0.2
0.4
0.6
0.8
1
1.2
1.4
30-Oct 4-Nov 9-Nov 14-Nov 19-Nov 24-Nov
TIME
MO
DIS
ND
VI
0
10
20
30
40
50
60
70
80
90
Ra
infa
lls (mm
)
Rainfalls (Max)
Rainfalls (MEAN)
Rainfalls MIN
Cullingral
Merriwa Park
Midlothian
Dales
Illogan
Roscommon
Stanley
Pembroke
NDVI versus TIME
Viviana Maggioni
2nd NAFE Workshop
NDWI versus TIME
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
30-Oct 4-Nov 9-Nov 14-Nov 19-Nov 24-Nov
TIME
ND
WI
21
30
0
10
20
30
40
50
60
70
80
90
Ra
infa
lls (mm
)
Rainfalls (MAX)
Rainfalls (MEAN)
Rainfalls (MIN)
Cullingral
Merriwa Park
Midlothian
Dales
Illogan
Roscommon
Stanley
Pembroke
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
30-Oct 4-Nov 9-Nov 14-Nov 19-Nov 24-Nov
TIME
ND
WI
16
40
0
10
20
30
40
50
60
70
80
90
Ra
infa
lls (mm
)
Rainfalls (MAX)
Rainfalls (MEAN)
Rainfalls (MIN)
Cullingral
Merriwa Park
Midlothian
Dales
Illogan
Roscommon
Stanley
Pembroke
Viviana Maggioni
NIR – SWIR1640nm
NIR + SWIR1640nm
NDWI1640=_______
_______NIR + SWIR2130nm
NIR - SWIR2130nmNDWI2130=
2nd NAFE Workshop
VWC Relationships
y = 4.8134x - 0.5456
y = 0.214x + 0.2348
0
0.5
1
1.5
2
2.5
3
3.5
0 0.2 0.4 0.6 0.8 1
GROUND NDVI
VW
C (
kg/m
^2)
NATIVE
CROP
Linear (CROP)
Linear (NATIVE)
y = 0.1496x + 0.3184
y = 13.204x2 + 1.621x0
0.5
1
1.5
2
2.5
3
3.5
0 0.2 0.4 0.6
NDWI 1640
VW
C (
kg/m
^2)
NATIVE
CROP
Linear (NATIVE)
Poly. (CROP)
y = 11.02x - 3.1207
y = 0.7828x + 0.0063
0
0.5
1
1.5
2
2.5
3
3.5
0 0.1 0.2 0.3 0.4 0.5 0.6
NDWI 2130
VW
C (
kg/m
^2)
NATIVE
CROP
Linear (CROP)
Linear (NATIVE)
• Native Grass
• Crop
• Native Grass
• Crop
• Native Grass
• Crop
R-squared RMSE
0.6998 0.0228
0.9573 0.1794
0.9036 0.0206
0.7457 0.4531
0.0295 0.0654
0.7931 0.3861
NDVI
NDWI 2130
NDWI 1640
Viviana Maggioni
2nd NAFE Workshop
Dry Biomass Relationships
• Native Grass
• Crop
• Native Grass
• Crop
• Native Grass
• Crop
R-squared RMSE0.3531 0.0794
0.8292 0.1057
0.4214 0.0956
0.7881 0.1656
0.4121 0.1165
0.5893 0.1932
y = 3.0491x + 0.0099
y = 3.0819x - 0.09250
0.2
0.4
0.6
0.8
1
1.2
1.4
0 0.2 0.4 0.6
NDWI 1640
DR
Y B
IOM
AS
S (
kg/m
^2) CROP
NATIVE
Linear (CROP)
Linear (NATIVE)
y = 1.3156x + 0.0244
y = -0.3597x + 0.72130
0.2
0.4
0.6
0.8
1
1.2
1.4
0 0.2 0.4 0.6 0.8 1
NDVI
DR
Y B
IOM
AS
S (
kg/m
^2) CROP
NATIVE
Linear (CROP)
Linear (NATIVE)
y = 2.3046x - 0.1634
y = 1.042x + 0.1230
0.2
0.4
0.6
0.8
1
1.2
1.4
0 0.2 0.4 0.6
NDWI 2130
DR
Y B
IOM
AS
S (
kg/m
^2) CROP
NATIVE
Linear (CROP)
Linear (NATIVE)
NDVI
NDWI 1640
NDWI 2130
Viviana Maggioni
2nd NAFE Workshop
VWC & Dry Biomass versus TIME
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
30-Oct 4-Nov 9-Nov 14-Nov 19-Nov 24-Nov
TIME
VW
C (
kg/m
^2)
0
10
20
30
40
50
60
70
80
90R
ain
falls (m
m)
Rainfalls (Max)
Rainfalls (MEAN)
Rainfalls MIN
Cullingral
Merriwa Park
Midlothian
Dales
Illogan
Roscommon
Stanley
Pembroke
0
0.5
1
1.5
2
2.5
3
30-Oct 4-Nov 9-Nov 14-Nov 19-Nov 24-Nov
TIME
Dry
Bio
ma
ss (
kg/m
^2)
0
10
20
30
40
50
60
70
80
90
Ra
infa
lls (mm
)
Rainfalls (Max)
Rainfalls (MEAN)
Rainfalls MIN
Cullingral
Merriwa Park
Midlothian
Dales
Illogan
Roscommon
Stanley
Pembroke
Viviana Maggioni
2nd NAFE Workshop
MODIS Data31 OCT 3 NOV2 NOV1 NOV 5 NOV
6 NOV 11 NOV9 NOV8 NOV7 NOV
13 NOV12 NOV 17 NOV16 NOV14 NOV
22 NOV21 NOV19 NOV18 NOV 23 NOV
Viviana Maggioni
2nd NAFE Workshop
How many samples?
0
0.5
1
1.5
2
2.5
1 2 3 4 5 6 7 8 9 10 11 12 13 14
MERRIWA PARK WEEK 1V
WC
(kg
/m^2
)
0
0.5
1
1.5
2
2.5
1 2 3 4 5 6 7 8 9 10 11 12 13 14
MERRIWA PARK WEEK 3
VW
C (
kg/m
^2)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
STANLEY WEEK 1
VW
C (
kg/m
^2)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
STANLEY WEEK 3
VW
C (
kg/m
^2)
Viviana Maggioni
2nd NAFE Workshop
Next Steps
• Landcover map
• Thumbnails of spatial VWC
• Aircraft NDVI validation
• Microwave Polarization Difference Index (MPDI) relationship
Merriwa Park3
0
Viviana Maggioni
2nd NAFE Workshop
Thank you
Viviana Maggioni
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