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.