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Scattering And Absorption of Light in Planetary Regoliths
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Adjacency effects on water surfaces: primary scattering approximation and sensitivity study.

R Santer1, C Schmechtig

  • 1Laboratoire Interdisciplinaire des Sciences de l'Environnement, ELICO, Centre National de la Recherche Scientifique, Unité Propre de Recherche et Enseignement Supérieur Associée 8051, Université du Littoral Côte d'Opale, Maison de la Recherche, 32 Avenue Foch, BP 59 62930 Wimereux, France. santer@loalit.univlittoral.fr

Applied Optics
|March 14, 2008
PubMed
Summary
This summary is machine-generated.

Atmospheric corrections are vital for ocean color imagery. This study simplifies modeling adjacency effects, improving coastal water chlorophyll retrieval, though aerosol vertical distribution limits satellite correction accuracy.

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Area of Science:

  • Remote Sensing
  • Ocean Optics
  • Atmospheric Science

Background:

  • Atmospheric corrections are crucial for accurate ocean color imagery interpretation.
  • Coastal areas present challenges due to land-reflected light influencing sensor readings.
  • Modeling adjacency effects, the reduction in image contrast with increased atmospheric turbidity, is computationally intensive.

Purpose of the Study:

  • To develop a simplified approach for modeling adjacency effects in ocean color imagery.
  • To investigate the impact of aerosol vertical distribution on measurement accuracy.
  • To propose corrections for molecular scattering and Fresnel reflection in coastal waters.

Main Methods:

  • Developed a simple approach based on the primary scattering approximation for nadir and off-nadir views.
  • Conducted a sensitivity study on aerosol vertical distribution's impact on measurement accuracy.
  • Proposed a correction for molecular scattering using the isotropic approximation.
  • Addressed Fresnel reflection coupling with the atmosphere for coastal water observations.
  • Studied adjacency effects on chlorophyll abundance retrieval using red/infrared bands and blue/green-ratio techniques.

Main Results:

  • A simple primary scattering approximation effectively models adjacency effects.
  • Aerosol vertical distribution is a critical factor for measurement accuracy, but generally undeterminable from space.
  • A simple correction for molecular scattering based on the isotropic approximation is proposed.
  • Adjacency effects influence chlorophyll abundance determination, but combined spectral band usage aids retrieval.

Conclusions:

  • The developed simple approach aids in modeling adjacency effects for ocean color imagery.
  • Accurate correction of adjacency effects on satellite imagery is limited by unknown aerosol vertical distribution.
  • Proposed corrections for molecular scattering and Fresnel reflection enhance coastal water remote sensing.
  • The study demonstrates a method to improve chlorophyll retrieval in coastal waters despite adjacency effects.