IRS-1A/IB Digital Product Information

IRS-1A/1B data contains four files which are being supplied through CD-ROM or Tapes (DAT and Exabyte).

The supplied media contains 5 files, which are 1) Volume directory file,
2) Leader file
3) Imagery file
4) Trailer file
5) Null volume file

Data can be extracted from Tape to disk through UNIX dd command with proper ibs and obs (block size) options or through commercial softwares.

In case of raw data (not geo-coded) of IRS-1A/1B, the file sizes are
1) volume dir file 1800 bytes
2) Leader file 13312 bytes
3) Imagery file 25202520 bytes
4) Trailer file 1800 bytes
5)Null volume 360 bytes.

In Imagery file, there is header with 2520 bytes. The imagery file is in BIL format.
No. Lines = 2500 No. Pixels= 2520

IRS-1C/ID (LISS-III) Digital Product Information (FULL SCENE)

This product also contains 5 files with the sizes
1) Volume dir file 1800 bytes
2) Leader file 97920 bytes
3) Imagery file 155624220
4) Trailer file 1800
5) Null file 360 bytes

In Imagery File, there is a header of size 540 bytes. No. of Band : 4 (BIL format)
No. of Lines: 6004
No. of Pixels: 6480


IRS-1C/1D (LISS-III) Digital Product (quarter scene)

This product contains 5 files with the size
1) Volume dir file 1800 bytes
2) Leader file 91800 bytes
3) Imagery file 37430460
4) Trailer file 1800
5) Null file 360 bytes

Header size : 540 pixels
Number of Lines : 3058
Number of Pixels : 3060


IRS-1C/1D PAN Geocoded Product of small area

This product contains 5 files
1800 Bytes VOLUME.PAN
73440 Bytes LEADER.PAN
8070300 Bytes IMAGERY.PAN
720 Byte TRAILER.PAN
360 Bytes NULL.PAN

Header size : 540 Pixels
The number of lines : 2802
The number of pixels : 2880
Please note that 31 pixels are prefixed and 114 pixels are suffixed in 2880 pixels


Here is the program in 'C' for the separation of bands from BIL format band_sep.c
For decoding Leader file of IRS-1C/1D, you please visit NRSA site and download programme.