1. The actual data file (afp90agi.bil) has no header itself, instead the information is contained in a separate file (afp90agi.hdr) that should come bundled in the zip file.
2. The bounds of the data file are:
3. The data are actually 32 bit.
4. The reference system is geographic (not projected), the units are decimal degrees and the spheroid is World Geodetic System, 1984 (WGS84).
Please note that the byte order is Motorola (UNIX), not Intel. I believe that Idrisi has a command that will change the byte order to Intel. If I recall correctly, the command in Idrisi is called ‘flip’.