Overview
The BIL, BIP and BSQ raster data formats were originally developed by USGS for CCT tape formats for Landsat satellite data from 1972 on. These are simple binary files representing a raster of one or more image bands, accompanied by an ASCII header file (*.hdr) with image information. The main file extension depends on the format, or storage sequence:
*.BIL : Bands Interleaved by Pixel
*.BIP : Bands Interleved by Line
*.BSQ : Bands Sequential
The file format was documented by ESRI online. (older version here) and supports integer (8,16 or 32 bit) pixel values in signed or unsigned format, in either little- or big endian storage order.
