Atmospheric correction in presence of sun glint: the POLYMER Algorithm
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1 Atmospheric correction in presence of sun glint: the POLYMER Algorithm Dominique Jolivet François Steinmetz Pierre-Yves Deschamps Jan 17, 2011 Atelier National Couleur de l'eau - GIS COOC
2 c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 2 / 14 Presentation of HYGEOS SME, 10 people, founded in 2001, located in Lille, France R&D in Optical Remote Sensing, Radiative Transfer Development of advanced algorithms for ocean (water constituents), atmosphere (cloud, aerosol and gases) and continental surfaces monitoring (vegetation, land cover) from space optical sensors (ENVISAT/MERIS, MSG, MODIS...) Customers : Space Agencies (CNES, ESA, EUMETAT...), Space Data Processing Center/ Research Center, Europe (GMES project), Space industries (Alcatel, CLS), Regional and National Institutions (air quality)
3 c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 3 / 14 Activities (1): Simulation of the signal Radiative transfer Monte Carlo code spherical geometry including polarization rough sea surface including in-water scattering and absorption Sensitivity study on atmospheric corrections algorithm performances (present and future missions)
4 c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 4 / 14 Activities (2): applications using MSG/SEVIRI Total suspended matter in the English channel at 15 min time resolution. Neukermans G., K. Ruddick, E. Bernard, D. Ramon, B. Nechad, and P.-Y. Deschamps, Mapping total suspended matter from geostationary satellites: a feasibility study with SEVIRI in the Southern North Sea, Opt. Express, 17, (2009). Aerosol Optical Thickness Bernard E., Ramon D., Jolivet D., Moulin C., Riedi J., Deschamps P.-Y., Nicolas J.-M. and Hagolle O., "Aerosol retrieval over land in the 635nm channel of MSG/SEVIRI sensor: a hourly and daily AOT product above Europe", In proceedings of the EUMETSAT Meteorological Satellite Conference, September 2009, Bath, England.
5 c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 5 / 14 Polymer algorithm: Introduction Original algorithm for atmospheric scattering and sun glint correction Spectral matching over the whole available spectrum (412 to 865 nm) using: a polynomial atmospheric model (in wavelength) a water reectance model Initial target: retrieve MERIS Ocean Colour data over the sun glint increase useful spatial coverage Paper accepted in Optics Express: Steinmetz, Deschamps, Ramon, "Atmospheric correction in presence of sun glint: application to MERIS"
6 Example of level 2 product Bay of Biscay June 21, 2005 Sun glint re ectance 10% c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 6 / 14
7 Example of level 2 product MEGS (standard algorithm) POLYMER chl-a ρ+ w (560) c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 7 / 14
8 Comparison of 2 scenes taken one day apart With sun glint RGB composite ρ+ w (490) May 14, 2007 c 2011 Without sun glint RGB composite May 15, 2007 ρ+ w (490) Atmospheric correction in presence of sun glint: the POLYMER Algorithm 8 / 14
9 c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 9 / 14 Operational NRT application by CLS CLS, subsidiary from CNES and IFREMER, operates a NRT oceanographic data service for scientic, institutional or private users (e.g., oshore shing industry, oshore oil and gas industry). POLYMER operationally used since late 2008 to produce MERIS Level 2 from ESA Level 1 NRT products. 10-day global chlorophyll maps are then built in NRT merging MODIS and MERIS Polymer Level 2 products
10 c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 10 / 14 Daily composite of chl, standard product 8% ocean coverage
11 c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 11 / 14 Daily composite of chl, POLYMER product 20% ocean coverage
12 c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 12 / 14 MODIS and POLYMER 10-day composites MEGS POLYMER MODIS 49% coverage 69% coverage 71% coverage Comparable coverage by MODIS and MERIS/POLYMER
13 c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 13 / 14 Conclusion Algorithm successfully applied to MERIS Robust to sun glint, aerosols, thin clouds and environment eect Validation against in-situ measurements: comparable accuracies of the (agged) standard algorithm, POLYMER outside sun glint and POLYMER inside sun glint Used for almost 2 years in NRT by CLS Polymer is candidate for processing of Ocean Colour ECV (ESA CCI) Work in progress Application to case 2 waters Application to GOCI, MODIS, SeaWiFS
14 Thank you for your attention! c 2011 Atmospheric correction in presence of sun glint: the POLYMER Algorithm 14 / 14
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