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Algal blooms are ecological disasters that threaten the aquatic ecosystem. As a result it is important to identify and monitor their development for the protection and management of the water biome.
Conventional in-situ methods are not ideal for such an activity as they are time consuming and require substantial resources. Remote sensing is therefore the appropriate technology for such an application because of its ability to cover wide areas at different temporal scales. The different satellite images taken at various wavelengths, including the infrared region, make it possible to identify algal bloom because of their high chlorophyll concentration.
The Hartbeespoort Dam and the Bospoort Dam situated north and northeast of Pretoria respectively, are affected by algal bloom.
An algal bloom is a rapid increase or accumulation in the population of algae (typically microscopic) in a water system.