Algal Biomass

Several spectral indices have proved useful for the retrieval and mapping of chlorophyll a levels in inland waters, with this being indicative of algal biomass.

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Water depth

The high temporal frequency of planetscope observations allows for regular monitoring of water levels (e.g., in reservoirs) by combining water extent and bathymetric information, allows water depth to be routinely estimated.

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Pollution is often manifested in changes in water colour or different impacts (e.g., increased algal blooms as a result of higher nutrient loads).

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These can be caused by increased rainfall but these are often small and difficult to detect from even high resolution sensors. Erosion from areas affected lead to changes in water quality, turbidity and colour. The impacts can extend downstream.

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