IRasterWorkspaceEx.OpenRasterDataset和IRasterWorkspace.OpenRasterDataset区别：
Remarks
IRasterWorkspaceEx：The OpenRasterDataset method opens a raster dataset in the geodatabase. It provides access to the RasterDataset geodatabase workspace
IRasterWorkspace：OpenRasterDataset accesses raster datasets in file system. It creates a file based RasterDataset.
转载于:https://www.cnblogs.com/willwayer/archive/2009/07/02/1515288.html
