The remote sensing images are usually imported directly into the professional relational database.

Nevertheless, for the large data size of images, the time consuming on reading and transmission would be

unendurable, which adversely affects the user-friendly function. Starting with a different angle, the authors

transform the remote sensing image into the user-defined file which can be handled by the operation system. Metadata

information of images can be extracted and stored into the relational database, with each metadata item

corresponding to a user-defined file. In this way, the importing and exporting of mass remote sensing data can be

greatly speeded up, and the metadata information can be consulted quickly and conveniently.