Research On Typical Questions Of China Islands, Sand Banks And Coral Reefs Remote Sensing Monitoring Application

Islands, sand banks and coral reefs play a crucial role in marine economic development. But negligence in the past led to improper exploitations, and thus incurs a waste of resources and destruction of environment. Remote sensing, capable of large-scale, real-time, simultaneous and high-frequency dynamic monitoring at a lower cost, has become increasingly important in environment survey. It can not only help researchers quickly learn about the surroundings and utilization of the islands, sand banks and coral reefs, but also enable them grasp the law of changes effected by the nature or human beings. This will offer basic data for the exploitation of the islands, sand banks and coral reefs and the marine economic development.This paper, based on the general exploitation of islands, sand banks and coral reefs and related remote sensing application researches, puts forward three questions: (1) How to monitor changes of islands effected by exploitation; (2) How to monitor the shape and distribution of large-scale radiate sandbanks; (3) How to evaluate the application of hyper-spectrum, high-resolution and SAR in the monitoring of coral reefs.To answer the above questions, the paper, with south five islands of Miao Islands, radiate sand ridges system off Jiangsu Province, coral reefs in South China Sea as the object, conducts the researches into remote sensing dynamic monitoring of island exploitation, the shape and distribution of radiate sandbanks and environment of coral reefs. In terms of the monitoring of south five islands of Miao islands, SAR and optical remote sensing technology are used to obtain the changes of reclamation, land use and floating raft culture in the last 5-10 years. The result indicates that SAR can is more feasible in the future monitoring.In terms of radiate sandbanks monitoring, the paper compares the capabilities of SAR and optical remote sensing in monitoring the shape and distribution of the radiate sand ridges in the northern, and points out that SAR is more effective.In terms of the monitoring of coral reefs in South China Sea, the paper analyses the hyperspectral features of coral reefs, shows the high spatial resolution remote sensing information extraction results on the coral reef type, coastline, intertidal and wetlands and demonstrates the potential of SAR in monitoring coral reef environment.