BIL is a format for of Remote Sensing Image Data

Multi-band image data are represented by a combination of spatial position (pixel number and line number) and band.

The data format for multi-band images is classified into the following three types

1. BSQ format (band sequential) image data (pixel number and line number) of each band are separately arranged.
2. BIL format (band interleaved by line) line data are arranged in the order of band number and repeated with respect to line number.
3. BIP format (band interleaved by pixel) A set of multi-band data with respect to each pixel arranged spatially by pixel number and line number.

It is not my intention to fully describe the BIL Format.