An ASRP directory contains information needed to view images. It contains multiple files, each containing complementary information about the image. The GeneralInformationFile (GEN) contains information about the image such as coverage and location. The QualityFile (QAL) contains accuracy and color information. The GeoReferenceFile (GER) contains projection information, the SourceFile (SOU) contains information about the map that was used to create the images. The RasterGeoDataFile (IMG) contains the actual pixel information.
This class knows how to use all of these files to create images, which are made up of subframe tiles called blocks.