some preliminary tests on vgt data over france j-l champeaux, l franchisteguy, s. garrigues...
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![Page 1: Some preliminary tests on VGT data over France J-L CHAMPEAUX, L FRANCHISTEGUY, S. GARRIGUES CNRM/GMME/MATIS](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649dbf5503460f94ab2983/html5/thumbnails/1.jpg)
Some preliminary tests on VGT data over France
J-L CHAMPEAUX, L FRANCHISTEGUY, S. GARRIGUES
CNRM/GMME/MATIS
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Cloud mask evaluation
Status map cloud mask.
New VITO cloud mask (Lissens and al, Belgirate 2000) with thresholds tuned over the world applied to TOA reflectance: a pixel is declared clear if B0<493 OR SWIR<180.
New tuned cloud mask with thresholds tuned over France for surface reflectance (S1 data): a pixel is declared cloudy if B0>=220 AND SWIR>=180
Comparison between:
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What strategy for the cloud mask?
• use the status map (poor quality)
• use the VITO thresholds Must be applied to TOA reflectances
• determine new thresholds on B0 for specific window
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Work on bidirectional effects:
• Evaluation of bidirectional effects in different solar-target-sensor configurations over homogeneous landcover areas
• Implementation and test of BDC method (B.Duchemin, CESBIO)
• Proposal VEGA2000: Determination of global albedo from VGT products
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VEGA2000 proposal : Determination of global albedo products from VGT instrument data for use in numerical weather forecast and climate models.L. FRANCHISTEGUY(CNRM/GMME)
Preliminary study with a data set of VGT-P products (April 1998 – March 1999) a) Atmospheric corrections : SMACTOA reflectances surface reflectances
b) BRDF kernel-driven model inversion : correction of bidirectional effects (30 days compositing period with a sliding periodof 10 days). c) Retrieval of land surface albedo (directional albedo) for a 100*100 km domain located in southeast part of France.
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Method for retrieval of surface properties
Inversion of a BRDF model :
s, v, = k0 + k1 f1s, v, + k2 f2s, v,
(model of Roujean et al., 1992)
K0: Normalized reflectance for s=0 and v=0
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DECIDUOUS PIXELS ( South of France)
AA
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Unsupervised classification using 10 days MVC ( from 1/1/2000 to 31/09/2000 over SO France
Corine Land Cover dataset at 1km resolution
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Unsupervised classification using 10 days MVC from 1/1/2000 to 31/09/2000 over SO France