By using the data of the landsat and with the help of computer image processing method

the information of shallow sea’s configuration and terrain are obtained in the areas of Chang Dao Island （Southern Bohai Strait）

Ming Jian

Ou Jian and Pearl river mouth. In this paper

the auther discusses the characteristics of under-water terrain and the module of picking up water depth message. To obtain the better result

the multiseaonal and multispectral data are needed to pick up the information. It can be seen that the application of satellite remote sensing and image processing technology is one of the method of shallow sea investigation

and it’s a useful supplement for ordinary investigation

especially for the investigation in the changeable and dangerous oceanic areas. Also

its applications in sea shore planning

developing and managing such as environmental monitoring and evaluating for acquatic culture in bay.