1 - GLC 2000 Ispra 03-2002 STATUS OF SPOT VEGETATION  VEGETATION 2  NEW STANDARD PRODUCTS  VEGETATION 2002 Gilbert Saint - VEGETATION Programme Scientist.

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Presentation transcript:

1 - GLC 2000 Ispra STATUS OF SPOT VEGETATION  VEGETATION 2  NEW STANDARD PRODUCTS  VEGETATION 2002 Gilbert Saint - VEGETATION Programme Scientist

2 - GLC 2000 Ispra VEGETATION 2 vSame instrument as VEGETATION 1 with minor improvements on optics (less stray light, better detector homogeneity...) and to increase life time to 5 years vSPOT 5 having a star tracker, should provide better geometry without Ground Control Points (VGT 1 : 0.1 multispectral, 0.3 multitemporal for >90% pixels) vReady for launch, waiting for availability of launch pad : last known date is May 3rd vCommissionning 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.

3 - GLC 2000 Ispra NEW STANDARD PRODUCTS vFrom 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 vThree improvements selected as a first set : cloud detection, cloud shadow… aerosol content correction bidirectional effects correction on syntheses vDevelopment 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 vActors : VITO & CESBIO

4 - GLC 2000 Ispra CLOUD DETECTION B3 (SPOT4-VEGETATION) Amazon River, (Venezuela) Initial mask

5 - GLC 2000 Ispra CLOUD DETECTION BINARY MASK B3 (SPOT4-VEGETATION) Amazon River, (Venezuela)

6 - GLC 2000 Ispra CLOUD DETECTION 3 LEVEL MASK B3 (SPOT4-VEGETATION) Amazon River, (Venezuela)

7 - GLC 2000 Ispra CLOUD SHADOW DETECTION B3 (SPOT4-VEGETATION) SAHARA. CLOUDS (light green) SHADOWS (magenta)

8 - GLC 2000 Ispra AEROSOL CORRECTION vBasis 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. vComplete description available in proceedings of VEGETATION 2000

9 - GLC 2000 Ispra Principle of the algorithm  _ i_toa SMAC_molecular If not cloudy and reliable CN If  _swir_surfo<threshold1 && NDVI_surfo>threshold2 && no snow  _ i_surfo  blue_reference =  _swir_surfo/RATIO RATIO=Ae B.NDVI_surfo yes  p such as SMAC_aero(  blue_surfo,  p) =  blue_reference  p_retrieved SMAC_aerosols  _ i_surf  p_climato nono

10 - GLC 2000 Ispra Latitudinal transect 20°E

11 - GLC 2000 Ispra Latitudinal transect 4°W

12 - GLC 2000 Ispra Aerosol Optical Thickness at.550µ (09/11/2001)

13 - GLC 2000 Ispra 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

14 - GLC 2000 Ispra DATA SET (2001) 6 MVC10_8km 05/0105/1107/ /0110/11 31 NEW BDC SYNTHESES 8KM RES FROM 21/02/2001 TO 31/12/2001 t

15 - GLC 2000 Ispra VALIDATION POINTS FOR TEMPORAL PROFILES Mettre la carte avec la totalité des points

16 - GLC 2000 Ispra NDVI (2001) NORTH AMERICA BDC && MVC

17 - GLC 2000 Ispra B2 (2001) EUROPE BDC && MVC

18 - GLC 2000 Ispra B3 (2001) EUROPE BDC && MVC

19 - GLC 2000 Ispra NDVI (2001) EUROPE BDC && MVC

20 - GLC 2000 Ispra SWIR (2001) EUROPE BDC && MVC

21 - GLC 2000 Ispra B2 (2001) AFRICA BDC && MVC

22 - GLC 2000 Ispra B3 (2001) AFRICA BDC && MVC

23 - GLC 2000 Ispra NDVI (2001) AFRICA BDC && MVC

24 - GLC 2000 Ispra B4 (2001) AFRICA BDC && MVC

25 - GLC 2000 Ispra NEW STANDARD PRODUCTS CONCLUSION vAcceptance after long validation phase, vProduction began in May 2001 for validation : data are available from that date vNow waiting for next proposals for improvements … but two criteria validation acceptance by a large community

26 - GLC 2000 Ispra VEGETATION 2002 vAs a follow-on to VEGETATION 2000 in Belgirate, VEGETATION 2002Nov 19-22, 2002 Antwerp Belgium vOpen to presentations of any use of VEGETATION products, either for scientific or more applied purposes vParticular attention to VEGA 2000 and GLC 2000 results vTechnical news on quality of the two systems vFirst announcement in press, look after your (e)mail

27 - GLC 2000 Ispra OTHER MEANS FOR EXCHANGE : vSeveral VEGETATION Web sites with a common entry point : with several sections : technical, scientific, commercial vDiscussion forum available on the entry point : do not hesitate to ask questions, make proposals….

28 - GLC 2000 Ispra STATUS OF SPOT VEGETATION  VEGETATION 2  NEW STANDARD PRODUCTS  VEGETATION 2002 Gilbert Saint - VEGETATION Programme Scientist