Users should select the ".GEN" file which is located in a subdirectory on the disk. The name of this subdirectory varies with each disk. An example name is "/cdrom/jaus0101/jaus0101.gen".
To select an image other than the default image, the image number is specified as if it were a file in the ".GEN" file's directory. As an example, "/cdrom/cous0101/cous0101.gen/2" would select the second file on a disk.
Georeferencing information is gathered from the disk, but other text and descriptive information is not. Writing an ADRG disk is not supported by the GeoGateway layer.