AQUALOOKS - Improving atmospheric correction and aquatic particle retrieval with bidirectional remote sensing data

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Context and objectives

Algorithms for remote sensing of algal and non-algal aquatic particle concentrations are quite mature. However, very significant errors from atmospheric correction and sunglint removal algorithms are a major cause of low or unusable quality data. Although many approaches are being investigated to achieve improvements, the use of multi-look satellite data has received little attention. There are a number of satellite missions for which multi-look data is available and is relevant for aquatic applications including Pléiades, CHRIS-PROBA and for certain regions, SEVIRI. The optical probing of water in different directions provides extra information on the atmosphere, air-water interface and aquatic particles that could be used to improve atmospheric correction and sunglint removal.

The general objective of the project is to improve the optical remote sensing of aquatic particles by using multi-look satellite data, particularly for turbid waters.

Project outcome

Expected scientific results

  • Multi-look algorithms for improved atmospheric correction.
  • Multi-look algorithms for improved air-water interface (including sunglint) correction. 
  • Multi-look algorithms for improved turbid water BRDF correction.
  • Above water radiometry able system (pan-and-tilt system) able to provide multi-look BRDF data.
  • Determination of the feasibility of multi-look algorithms for retrieval of aquatic particle size/type.
  • Recommendations for future satellite missions as regards design of multi-look sensors for aquatic applications

Expected products and services

Expected products is a new generation of level 2 water products (water leaving reflectance) for Sentinel 2 and Landsat 8 (other platforms are possible) with improvements in data quality and quantity (less data masked by sunglint).