All four bands are written to the tape before values for the next pixel are represented. Any given pixel located on the tape contains values for all four bands written directly in sequence. This format may be awkward to use if only certain bands of the imagery are needed. Often data in BIP format is organized into four separate panels, or tiles, consisting of vertical strips each 840 lines wide in the x direction and 2,342 lines long in the y direction. In order to read all four bands of the image, all four panels must be pieced together to form the entire scene (Campbell, 1987).Band Interleaved By Line Format (BIL)
Each line is represented in all four bands before the next line is recorded. Like the BIP format, it is a useful to use if all bands of the imagery are to be used in the analysis. If some bands are not of interest, the format is inefficient if the data are on tape, since it is necessary to read serially past unwanted data.