readpfx Documentation

readpfx - Read prefix bytes in a MEX HRSC file
This program will read prefix bytes from a VICAR-formatted
Mars Express HRSC file. The ephemeris time and exposure
time are both extracted from the prefix bytes and then
written to an ASCII file. The difference between ephemeris
times for consecutive image lines is also written to the
ASCII file to determine where skipped lines exist. These
values can then be accessed by a Perl script. This program
was written primarily to handle the byte-swapping of the
prefix data for Solaris systems. The native format of the
MEX HRSC data is LSB. This program will work on Linux
systems as well.

Programmer: Janet Barrett, U.S.G.S., Flagstaff, AZ

Input VICAR-formatted
MEX HRSC file

""

Base name of multi-
sectioned file

""

Number of sections in
input file

1

Output ASCII-formatted
file

""

Number of header bytes
to skip

0

Number of lines in the
image

0

Number of bytes in
each image line

0

ADDITIONAL NOTES:

Parm	Description
FROM	This is a VICAR-formatted HRSC file created by the Mars Express mission. If this file is over 2 gigabytes in size, then the file must be divided into smaller sections before it can be processed. Use the NSECTION and BASENAME parameters in this case.
BASENAME	Base name of a multi-sectioned file. If the input file had to be divided into smaller sections to be processed, then each file section must follow the naming convention of input.section#. The "input" portion of the filename is the original name of the file with the extension ".section#" appended. The # signifies an actual number, such as 1, 2, 3, so on that says what order the sections go together.
NSECTION	Number of sections in input file.
TO	This is the output ASCII-formatted file that will contain the ephemeris time, exposure time, and difference between consecutive ephemeris times for each line in the FROM file.
SKIP	This is the number of bytes to skip to get to the first image line of the FROM file.
NL	This is the number of lines in the FROM file.
NBYTES	This is the number of bytes in each line of the FROM file.