Toward Sentinel-2 High Resolution Remote Sensing of Suspended Particulate Matter in Very Turbid Waters: SPOT4 (Take5) Experiment in the Loire and Gironde Estuaries
|Author(s)||Gernez Pierre1, Lafon Virginie2, Lerouxel Astrid1, Curti Cecile3, Lubac Bertrand4, Cerisier Sylvain5, Barille Laurent1|
|Affiliation(s)||1 : Univ Nantes, EA Mer Mol Sante MMS 2160, F-44322 Nantes, France.
2 : Univ Bordeaux, GEO Transfert, UMR Environm & Paleoenvironm Ocean & Continentaux, F-33615 Pessac, France.
3 : I SEA, Bordeaux Technowest, F-33700 Merignac, France.
4 : Univ Bordeaux, UMR Environm & Paleoenvironm Ocean & Continentaux, F-33615 Pessac, France.
5 : Grp Interet Publ GIP Loire Estuaire, F-44200 Nantes, France.
|Source||Remote Sensing (2072-4292) (Mdpi Ag), 2015-08 , Vol. 7 , N. 8 , P. 9507-9528|
|WOS© Times Cited||28|
|Note||This article belongs to the Special Issue Lessons Learned from the SPOT4 (Take5): Experiment in Preparation for Sentinel-2)|
At the end of the SPOT4 mission, a four-month experiment was conducted in 2013 to acquire high spatial (20 m) and high temporal (5 days) resolution satellite data. In addition to the SPOT4 (Take5) dataset, we used several Landsat5, 7, 8 images to document the variations in suspended particulate matter (SPM) concentration in the turbid Gironde and Loire estuaries (France). Satellite-derived SPM concentration was validated using automated in situ turbidity measurements from two monitoring networks. The combination of a multi-temporal atmospheric correction method with a near-infrared to visible reflectance band ratio made it possible to quantify SPM surface concentration in moderately to extremely turbid waters (38-4320 g center dot m(-3)), at an accuracy sufficient to detect the maximum turbidity zone (MTZ) in both estuaries. Such a multi-sensor approach can be applied to high spatial resolution satellite archives and to the new ESA Sentinel-2 mission. It offers a promising framework to study the response of estuarine ecosystems to global changes at unprecedented spatio-temporal resolution.