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Performance of atmospheric correction procedures for turbid case 2 water scenes of MERIS

Roland Doerffer(1), Helmut Schiller(1), Wolfgang Schönfeld(1), Carsten Brockmann(2), Kai Sorensen(3) and Peter Regner(4)

(1) GKSS Research Center, Max-Planck-Str. 1, 21502 Geesthacht, Germany
(2) Brockmann Consult, Max-Planck-Str. 2, 21502 Geesthacht, Germany
(3) Norwegian Institute for Water Research (NIVA), Gaustadalleen 21, NO-0349 OSLO, Norway
(4) ESA/ESRIN, Via Galileo Galileo, 00044 Frascati, Rome, Italy

Abstract

The correction of the influence of the atmosphere on the retrieval of water leaving radiance reflectance spectra is one of the big challenges for remote sensing of coastal waters. Due to the absorption by high concentrations of phytoplankton and yellow substances the water leaving radiance in the blue spectral range can be extremely low. On the other hand, high suspended matter concentrations have a strong impact on the spectral bands in the near infrared, which are normally used for atmospheric correction assuming a black ocean in this spectral range. Due to these complicated conditions standard atmospheric correction procedures fail in waters such as the Baltic Sea or the coastal areas of the North Sea by producing negative reflectances in part of the spectrum. To find a solution for these waters a neural network (NN) approach as well a look up table procedure were developed. Different versions have been investigated, which uses either part or the full suite of MERIS bands. For training of the NN an atmosphere model was set up, which covers open ocean maritime and coastal urban conditions. It has been tested using radiometric measurements along transects in the North Sea. The procedure is available as a plug-in for the BEAM software.

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry