Advances in the study of Ulvapolifera monitoring with remote sensing

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The massive bloom of the green macroalgae Ulvaprolifera is called "green tide".The "green tide" event frequently happens in the world and is known as an oceanic disaster due to its bad effects on the marine ecological environment,coastal scene,seashore tourism and water sports.Remote sensing has the advantages over the conventional methods in oceanic monitoring because of its great capabilities of large-area,multi-resolution,multi-spectrum,quick and dynamic observations.Remote sensing has become a necessary method in the study of the origin,spatial pattern,evolution,size and movement of "green tide".At present,3 main approaches detecting Ulvaprolifera have been developed,which are single band threshold image segmentation method,multi-band ratio method and radiation transmission model method.The multi-band ratio method is most widely used,which includes two-band ratio algorithm,normalized differential vegetation index,floating algae index and normalized difference algae index.The method of radiation transmission model is mainly used to monitor Ulvaprolifera suspended in water,and its study is just in the initial stage.Further researches on distinguishing the difference between the spectrum of Ulvaprolifera and other type of floating algae,monitoring Ulvaprolifera suspended in water,solving the contradiction between the deficiency of monitoring capability and the needs of users are the directions of Ulvaprolifera monitoring in the future.