6.14 Image Masking

To perform image masking, an application can query the GeoRaster database for bitmap masks, retrieve the desired bitmap mask or masks, and apply the masking operation on the target GeoRaster object for the purpose of displaying the object or performing some other processing.

A bitmap mask (described in Bitmap Masks) can be stored as an independent GeoRaster object; it can also be stored as metadata inside a GeoRaster object and be associated with a single band or with the whole GeoRaster object.

You can also perform masking operations inside the database to generate new GeoRaster objects, using the SDO_GEOR.mask procedure.