1 - glc 2000 ispra 03-2002 status of spot vegetation vegetation 2 new standard products ...
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GLC 2000 Ispra 03-2002 1 -
STATUS OF SPOT VEGETATION
VEGETATION 2 NEW STANDARD PRODUCTS VEGETATION 2002
Gilbert Saint - VEGETATION Programme Scientist
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GLC 2000 Ispra 03-2002 2 -
VEGETATION 2
Same instrument as VEGETATION 1 with minor improvements on optics (less stray light, better detector homogeneity...) and to increase life time to 5 years
SPOT 5 having a star tracker, should provide better geometry without Ground Control Points
(VGT 1 : 0.1 multispectral, 0.3 multitemporal for >90% pixels)
Ready for launch, waiting for availability of launch pad : last known date is May 3rd
Commissionning phase should last 2 month, after which the two instruments will be available, VGT 2 as the principal one, VGT 1 to complement for special acquisitions.
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GLC 2000 Ispra 03-2002 3 -
NEW STANDARD PRODUCTS
From the beginning, Image Processing Center designed to accomodate for regular improvements of standard processing methods.New methods should be validated globally and accepted by a large community of users
Three improvements selected as a first set : cloud detection, cloud shadow… aerosol content correction bidirectional effects correction on syntheses
Development based on : proposal of methods to various users and acceptance by IUC, training of algorithms on model, real VGT and Polder data sets, presentation and
discussion in Belgirate VEGETATION 2000 extensive validation phase on real data : 10 months, global data processed by CTIV
Actors : VITO & CESBIO
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GLC 2000 Ispra 03-2002 4 -
CLOUD DETECTION
B3 (SPOT4-VEGETATION) Amazon River, (Venezuela) Initial mask
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GLC 2000 Ispra 03-2002 5 -
CLOUD DETECTION
BINARY MASKB3 (SPOT4-VEGETATION) Amazon River, (Venezuela)
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GLC 2000 Ispra 03-2002 6 -
CLOUD DETECTION
3 LEVEL MASKB3 (SPOT4-VEGETATION) Amazon River, (Venezuela)
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GLC 2000 Ispra 03-2002 7 -
CLOUD SHADOW DETECTION
B3 (SPOT4-VEGETATION) SAHARA.
CLOUDS (light green)SHADOWS (magenta)
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GLC 2000 Ispra 03-2002 8 -
AEROSOL CORRECTION
Basis for the method : for dark targets, SWIR/Blue surface reflectance ratio was supposed to be constant.Analysis on first years of data, Aeronet stations measurements… showed that ratio was function of surface NDVI
Operational algorithm developped as an approximation of a complete iterative solution. Validation of approximation done on VGT, Polder, Aeronet data.
Complete description available in proceedings of VEGETATION 2000
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GLC 2000 Ispra 03-2002 9 -
Principle of the algorithm
_i_toa SMAC_molecularIf not cloudy and reliable CN
If _swir_surfo<threshold1&&
NDVI_surfo>threshold2&& no snow
_i_surfo
blue_reference = _swir_surfo/RATIO
RATIO=AeB.NDVI_surfoyes
p such as SMAC_aero(blue_surfo, p) = blue_reference
p_retrieved
SMAC_aerosols_i_surf
p_climato
no
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GLC 2000 Ispra 03-2002 10 -
Latitudinal transect 20°E
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GLC 2000 Ispra 03-2002 11 -
Latitudinal transect 4°W
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GLC 2000 Ispra 03-2002 12 -
Aerosol Optical Thickness at .550µ (09/11/2001)
0 0.40.30.20.1 0.5
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GLC 2000 Ispra 03-2002 13 -
COLLECT LAST N CLOUD
FREE DATA
AJUST
BRDF
MODEL
BI-DIRECTIONAL CORRECTION
AVERAGE NORMALISED REFLECTANCES
USING AJUSTED BRDF,
NORMALISE CLEAR REFLECTANCES OF
LAST TEN DAYS
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GLC 2000 Ispra 03-2002 14 -
DATA SET (2001)
6 MVC10_8km
05/0105/11
07/010711
10/0110/11
31 NEW BDC SYNTHESES 8KM RES FROM 21/02/2001 TO 31/12/2001
t
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GLC 2000 Ispra 03-2002 15 -
60 VALIDATION POINTS FOR TEMPORAL PROFILES
Mettre la carte avec la totalité des points
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GLC 2000 Ispra 03-2002 16 -
NDVI (2001) NORTH AMERICA BDC && MVC
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GLC 2000 Ispra 03-2002 17 -
B2 (2001) EUROPE BDC && MVC
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GLC 2000 Ispra 03-2002 18 -
B3 (2001) EUROPE BDC && MVC
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GLC 2000 Ispra 03-2002 19 -
NDVI (2001) EUROPE BDC && MVC
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GLC 2000 Ispra 03-2002 20 -
SWIR (2001) EUROPE BDC && MVC
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GLC 2000 Ispra 03-2002 21 -
B2 (2001) AFRICA BDC && MVC
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GLC 2000 Ispra 03-2002 22 -
B3 (2001) AFRICA BDC && MVC
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GLC 2000 Ispra 03-2002 23 -
NDVI (2001) AFRICA BDC && MVC
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GLC 2000 Ispra 03-2002 24 -
B4 (2001) AFRICA BDC && MVC
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GLC 2000 Ispra 03-2002 25 -
NEW STANDARD PRODUCTSCONCLUSION
Acceptance after long validation phase,
Production began in May 2001 for validation : data are available from that date
Now waiting for next proposals for improvements … but two criteria
validation acceptance by a large community
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GLC 2000 Ispra 03-2002 26 -
VEGETATION 2002
As a follow-on to VEGETATION 2000 in Belgirate,
VEGETATION 2002 Nov 19-22, 2002 Antwerp Belgium
Open to presentations of any use of VEGETATION products, either for scientific or more applied purposes
Particular attention to VEGA 2000 and GLC 2000 results
Technical news on quality of the two systems
First announcement in press, look after your (e)mail
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GLC 2000 Ispra 03-2002 27 -
OTHER MEANS FOR EXCHANGE :
Several VEGETATION Web sites with a common entry point :
http://www.spot-vegetation.com
with several sections :
technical,scientific,commercial
Discussion forum available on the entry point : do not hesitate to ask questions, make proposals….
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GLC 2000 Ispra 03-2002 28 -
STATUS OF SPOT VEGETATION
VEGETATION 2 NEW STANDARD PRODUCTS VEGETATION 2002
Gilbert Saint - VEGETATION Programme Scientist