When users access to the raster data, SDE will access to the raster data with suitable resolution.It will compress the file size immediately.So the efficiency can be increased.

• 当用户访问这个栅格数据，SDE将调用适合这个比例尺的栅格数据，它将实时的极大压缩了文件尺寸，所以访问效率将被提高。