Calibration and Validation
Objectives: (1) Characterization of the error budgets of officially distributed products of OLCI onboard Sentinel 3 satellites and COCTS/CZI onboard HY-1 satellites in coastal waters around China and Europe, e.g., Yellow Sea in China, English Channel in Europe, French Guiana in South America. (2) Examination of the consistency between OLCI and COCTS/CZI, and among other ocean color sensors in these waters. (3) Development and refinement regional algorithms to accurately retrieve marine environment parameters (optical and biogeochemical) in these regions of interest. (4) Utilization of OLCI and COCTS/CZI products to monitor the dynamic and quality of the Chinese and European coastal waters. Methods: In-situ data acquisition Bio-optical, biogeochemical and atmospheric data will be collected and processed following community widely accepted protocols in the areas of interest. Spatial-temporal match-up methodology The in-situ measurements are considered as the reference or ‘true’ values and will be compared with satellite data (pixels) both temporally and spatially over a given pixel-box. Both spatial box and temporal differences during match-up procedure should be selected with care in coastal waters. Moreover, product flags should also be selected appropriately to avoid suspicious or bad retrievals. (3) Satellite-satellite consistency examination Differences in wavelength/spectral response, spatial resolution as well as temporal difference should be thoroughly considered and corrected properly. Effect of adopting various atmospheric correction and retrieval algorithm may also impact product inconsistency. (4) Relationship analysis between reflectance and water constituents Refinement of existing or development of novel algorithms will be investigated, to improve the accuracy of the products (e.g., Chlorophyll a, suspended particulate matter) in local ecosystems. Deliverables: Annual Summary Report Report includes datasets, use of EO data from multiple sources, and outcomes. (2) Peer viewed publications 4~5 peer viewed papers will be planned under this proposal’s framework. (3) Novel EO dataset Novel EO products processed with refined and/or newly developed algorithms. Funding: Chinese partner: (1) National Key Research and Development Program of China – Real-time Validation and Correction of Ocean Color Products (2016YFC1400906) (2) National Satellite Engineering program of China – Field campaign and product evaluation of COCTS/CZI onboard HY-1C/1D(since 2018). French partner: (1) Centre National d’Etudes Spatiales (CNES) – Evaluation and improvement of OLCI atmospheric correction and bio-optical products over French coastal waters (Funding for sea campaigns) (2) Partenariat Hubert Curien (French ministry of Research, French ministry of Foreign Affairs) Monitoring the quality of French and Chinese coastal waters using OLCI and COCTS/CZI satellite images (Funding for travel in 2020)
