Mission Performance Centre SEN2COR ACIX-2 CMIX JOINT MEETING WASHINGTON DC UNITED STATES 17 OCTOBER 2018 SENTINEL-2 MISSION PERFORMANCE CENTRE / 1

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1 Mission Performance Centre SEN2COR ACIX-2 CMIX JOINT MEETING WASHINGTON DC UNITED STATES 17 OCTOBER 2018 SENTINEL-2 MISSION PERFORMANCE CENTRE / 1

2 OUTLINE âsen2cor overview âcloud Screening and scene Classification module âatmospheric Correction module âprototype using Meteorological Aerosol Optical Depth SENTINEL-2 MISSION PERFORMANCE CENTRE / 2

3 SEN2COR OVERVIEW: FACT SHEET â Single image processing algorithm with orthorectified L1C granule in input â Cloud Screening and Classification (Telespazio France) â Atmospheric Correction over land surface (inheritated from ATCOR DLR) â Radiative Transfer code: LibRadtran (Look-Up-Tables) â Python application: Command line tool Plug-in of S2 toolbox Integrated in S2 Ground Segment â Processing configuration: 3 XML files L1C product L2A_Process L2A product DEM LUTs SENTINEL-2 MISSION PERFORMANCE CENTRE / 3

4 SEN2COR OVERVIEW: MAIN PROCESSING STEPS (optional) Ø Look-up tables (rural & maritime aerosols) Ø DEM (default: SRTM v4 CGIAR) (or DTED provided by user) SENTINEL-2 MISSION PERFORMANCE CENTRE /4

5 CLOUD SCREENING AND CLASSIFICATION Cloud Confidence QI Snow Confidence QI Scene Classification SENTINEL-2 MISSION PERFORMANCE CENTRE / 5

6 CLOUD SCREENING AND CLASSIFICATION: ESA CCI SUPPORT Satellite : S2A Level: 1C Type: RGB composition Tile: 48NUG Date: Area: Singapore ESA CCI Data Package: - ESA CCI Land Cover (300 m) - ESA CCI Water Bodies (150 m) - ESA CCI Snow Occurrence (500 m) Without ESA CCI With ESA CCI Introduced with Sen2Cor version 2.5 Water detection improved Bright targets (urban and soils) Less false cloud detection Activated in Sentinel-2 PDGS in October 2018 (L2A PB 02.09). SENTINEL-2 MISSION PERFORMANCE CENTRE / 6

7 SEN2COR PROTOTYPE: ECMWF-CAMS 550 âfall back solution when DDV pixels are missing in the image. âecmwf-cams Total AOD at 550 nm short term forecast âsen2cor CAMS prototype developed by Telespazio France SENTINEL-2 MISSION PERFORMANCE CENTRE / 7

8 SEN2COR: SELECTED REFERENCES âlouis, J et al., Sen2Cor 2.5: Cloud Screening & Scene Classification Algorithm. Sentinel-2 Validation Team meeting âlouis, J. et al., Integration and Assimilation of Meteorological (ECMWF) Aerosol Estimates into Sen2cor Atmospheric Correction. IGARSS 2018 proceeding. ârichter, R., Louis, J., and Müller-Wilm, U. (2012). Sentinel-2 MSI Level 2A Products Algorithm Theoretical Basis Document, S2PAD-ATBD-0001, Issue 2.0 âs2 MPC team. Sentinel-2 L2A Data Quality Report Issue 06 (October 2018) SENTINEL-2 MISSION PERFORMANCE CENTRE / 8

9 THANK YOU FOR YOUR ATTENTION! Jérôme Louis Vincent Debaecker Uwe Müller-Wilm Bringfried Pflug Magdalena Main-Knorn SENTINEL-2 MISSION PERFORMANCE CENTRE / 9

10 ADDITIONAL SLIDES FOR DISCUSSION SENTINEL-2 MISSION PERFORMANCE CENTRE / 10

11 SEN2COR: CONFIGURATION & CALIBRATION Ground Image Processing Parameter (GIPP): â User GIPPs: L2A_GIPP.xml â Cloud Screening and scene Classification GIPPs â Atmospheric correction GIPPs GIPP Cirrus correction Visibility Default Off Variable Visibility Look-up-table selection Aerosol type Atm. profile Default Rural (maritime, auto) Summer (summer, winter) WV correction WV over water Smooth WV map Visibility BRDF correction On Land average 100 m 40 km No Ozone content Use metadata (select value of LUT) Adjacency range 1 km SENTINEL-2 MISSION PERFORMANCE CENTRE / 11

12 SEN2COR: BAND COMBINATIONS REQUIRED â Cirrus correction: Ø B10 (1375 nm, 60m) â AOT-retrieval: Ø B2 (490 nm, 10 m), B4 (665 nm, 10 m) & B12 (2190 nm, 20 m) â WV-retrieval: Ø B8A (865nm, 20 m), B9 (945nm, 60m) â SR-estimation, Terrain correction: Ø DEM GIPP Cirrus correction Visibility WV correction WV over water Smooth WV map Visibility BRDF correction Adjacency range Default Off Variable Visibility On Land average 100 m 40 km No 1 km SENTINEL-2 MISSION PERFORMANCE CENTRE / 12

13 SENTINEL-2 MISSION PERFORMANCE CENTRE âname: âtitle: M. Jérôme LOUIS Sentinel-2 Expert Support Laboratory L2A Leader âresponsible for: Calibration of the Level-2A processor (Sen2Cor) Validation of the Level-2A products (DLR support) L2A Processing Baseline and Product Definition maintenance âaffiliation: âlocation: âcontact: Telespazio France Toulouse, France SENTINEL-2 MISSION PERFORMANCE CENTRE / 13

14 L2A: ECMWF-CAMS AOD AT 550 NM ASSESSMENT Visualisation using: - Cloud coverage % - Pearson s corr. Coeff R(all): 0.76 Nsamples: 1022 SENTINEL-2 MISSION PERFORMANCE CENTRE / 14

15 L2A: ECMWF-CAMS AOD AT 550 NM ASSESSMENT Filtering using: - Aeronet quality (number of aeronet measurements around S2 - Pearson s corr. Coeff R(all): 0.80 Nsamples: 547 SENTINEL-2 MISSION PERFORMANCE CENTRE / 15

16 L2A: ECMWF-CAMS AOD AT 550 NM ASSESSMENT No direct correlation between cloud coverage and CAMS aod uncertainty Qualitative analysis of outliers shows that these are often related to a large weather front approaching the aeronet site. SENTINEL-2 MISSION PERFORMANCE CENTRE / 16

17 L2A CAL: CAMS FALLBACK: SEN2COR 2.5 ORIGINAL SENTINEL-2 MISSION PERFORMANCE CENTRE / 17

18 L2A CAL: CAMS FALLBACK: SEN2COR 2.5 PROTO CAMS SENTINEL-2 MISSION PERFORMANCE CENTRE / 18