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Water optics

We use satellite remote sensing for research on water optics. We consider water quality- changing substances that occur naturally in the water bodies, as well as substances from human- related activities such as agriculture, industry, fish farming and municipal sewerage. Different input levels and concentrations from different sources to the water can certainly change water quality and will be accounted as external factors that have an effect on the suitability of water quality. Analytical algorithms that measure CDOM (Colored Dissolved Organic Matter) component will be applied on the inversion of mathematical relationships among inherent optical properties, in order to derive concentrations of CDOM.

The research´s aspects will put more intention in understanding changes in water quality by studying changes in water color over time in inland water and coastal areas in Sweden, by using different types of sensors, with different resolutions, e.g. UAVs, Landsat8 and Sentinel-2.The main aim is to test how remotely sensed data can be used as a tool for monitoring change in water color and thus quality in inland and coastal water. The main component that could induce light reflectance from a water body, while also having an effect on water quality, is Colored Dissolved Organic Matter (CDOM). Scaling issues will be addressed by evaluating the way in which the optical signal can be integrated over space and time, in order to provide a stable estimation of variability in water quality, by coupling in-situ CDOM concentration data with remotely sensed data.