Indices MODIS Vegetation · 2016-07-29 · NDVI EVI MOD13A2: Scan Noise Description: The striping...
Transcript of Indices MODIS Vegetation · 2016-07-29 · NDVI EVI MOD13A2: Scan Noise Description: The striping...
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MODIS VegetationIndices
Alfredo Huete
Kamel Didan
Tomoaki Miura
Wim van Leeuwen
Terrestrial Biophysics and Remote Sensing lab
University of Arizona
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MODIS Standard VI ProductsMOD 13A2
1 km and 16-day
✷ Normalized Difference Vegetation Index(NDVI)
✷ Enhanced Vegetation Index (EVI)
✷ Quality Analysis (QA) Image
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1 kmNDVI
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1 kmEVI
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NDVI QA
Miura T., et al./TBRS
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EVI,1km
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NDVI
EVI
MOD13A2: Scan Noise
Description: The striping observed in L1Bpropagates into NDVI and EVI. The effects of thestriping on the compositing algorithm can also beseen in the average view zenith angle SDS.
NDVI, EVI, and View Zenith AngleSDS
MOD13A2.A2000065.h08v05.hdfTile ID
SD_MOD13_00131bCase No.
EVI
View ZenithAngle
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EVI
BlueReflectance
MOD13A2: Blue Reflectance and EVI
Description: Composite Blue reflectance havemany missing data, which propagate to EVI. Themissing blue reflectance was caused by both theblue band quality and the compositing algorithm.The compositing algorithm has been updated byKamel Didan and a new code is currently beingbaselined at MODAPS.
EVI and Blue ReflectanceSDS
MOD13A2.A2000081.h10v06.hdfTile ID
TM_MOD13A2Case No.
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DOY 81-96
DOY 97-112
DOY 113-1281 km EVI Time Series
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DOY 97-112
DOY 113-128
DOY 81-96
1 km NDVI Time Series
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1km EVI Time Series
1km NDVI Time Series
South America
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Description: A combined effect of a small numberof orbits (observations) and frequent cloud covercreates spatial discontinuities in the composite VIimages.
NDVI, EVI, and View Zenith AngleSDS
MOD13A2.A2000065.h11v10.hdfTile ID
TM_MOD13A2Case No.
MOD13A2: No. Orbits and Cloud CoverNDVI
View ZenithAngle
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MODIS - AVHRR Comparisons
✷ NDVI Continuity♦ narrower ‘red’ MODIS band with increased
chlorophyll sensitivity (band 1),
♦ narrower ‘NIR’ MODIS band with less watervapor absorption (band 2)
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AVHRR NDVI 2 week, 1km Compositemid-March 2000
USGS, EDC
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1 kmNDVI
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VI Comparisons (MODIS & AVHRR)
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-0.30 -0.15 0.00 0.15 0.30 0.45 0.60
EVI
0.75
0.60
0.45
0.30
NDVI 0.15
0.00
-0.15
-0.30
Grassland - Foresttransition with MODISdata
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MODIS Standard VI ProductsMOD 13A1
500 m and 16-day
✷ Normalized Difference Vegetation Index(NDVI)
✷ Enhanced Vegetation Index (EVI)
✷ Quality Analysis (QA) Image
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Global NDVI at 500 mDOY 113-128
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MOD13A1 QA
500m
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500 m South America
Forest Clearcutting
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NDVI 1 km/16 DaysTile No.: h20v11
View Zenith Angle (Degree*100)
-6000 -4000 -2000 0 2000 4000 6000
% F
requency
0
1
2
3
4MODISCVMVCMVC
17.2%
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NDVI 1km/16 DaysTile No: h20v11
NDVI
-2000 0 2000 4000 6000 8000 10000
% F
requency
0.0
0.5
1.0
1.5
2.0
2.5MODISCVMVCMVC
EVI 1km/16 DaysTile No: h20v11
EVI
-2000 0 2000 4000 6000 8000 10000
% F
requency0
1
2
3
4
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NDVI 1km/16 DaysTile No: h20v11
NDVI
-2000 0 2000 4000 6000 8000 10000
% F
requency
0.0
0.5
1.0
1.5
2.0
2.5MODISCVMVCMVC
EVI 1km/16 DaysTile No: h20v11
EVI
-2000 0 2000 4000 6000 8000 10000
% F
requency
0
1
2
3
4
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NDVI 1km/16 DaysTile No: h20v11
NDVI
-2000 0 2000 4000 6000 8000 10000
% F
requency
0.0
0.5
1.0
1.5
2.0
2.5MODISCVMVCMVC
EVI 1km/16 DaysTile No: h20v11
EVI
-2000 0 2000 4000 6000 8000 10000
% F
requency
0
1
2
3
4
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Conclusions
• VI performance coming along well
• Most problems are diminishing
• More work needed on compositingalgorithm and merging with cloud mask
• Need to investigate snow problem in EVI
• Aerosol resistance and VI saturation haveyet to be determined
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Alaska
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