NAME

       asa_im_decode - asa_im_decode

SYNOPSIS

       asa_im_decode <asa_im> <asa_ins> <out> <outType> <near_range>

DESCRIPTION

       This program is part of GMTSAR.

       *** asa_im_decode v1.1 by smb ***

       Decodes Envisat ASAR Image Mode Level 0 data.

       asa_im input image file(s) (multiple files if merging along-track)

       asa_ins
              input auxiliary instrument characterization data file

       out    output raw data file

       outType
              output file type (1=byte,4=float)

       near_range
              near range to which to align all lines (0=use first line near range)

       Notes:

       out  is  a  complex  file  with  no  headers (byte/float I1, byte/float Q1, byte/float I2,
       byte/float Q2, ...)

       if outType is byte, then the decoded floats are multiplied by  127.5,  shifted  by  127.5,
       rounded to the nearest integer and limited to the range 0-255

       starting  range computed as (rank*pri+windowStartTime)*c/2 where rank is the number of pri
       between transmitted pulse and return echo

       calibration/noise lines are replaced with previous echo data line

       missing lines within a data set and between adjacent along-track data sets are filled with
       zeroes in float mode and 0.*127.5+127.5 + .5 = 128 for byte mode

       auxiliary data files can be found at http://envisat.esa.int/services/auxiliary_data/asar/

       Envisat   ASAR   Product   Handbook,   Issue   1.1,  1  December  2002  can  be  found  at
       http://envisat.esa.int/dataproducts/asar/CNTR6-3-6.htm#eph.asar.asardf.0pASA_IM__0P

       *** asa_im_decode v1.1 by smb ***

       Decodes Envisat ASAR Image Mode Level 0 data.

       Usage: asa_im_decode <asa_im> <asa_ins> <out> <outType> <near_range>

       asa_im input image file(s) (multiple files if merging along-track)

       asa_ins
              input auxiliary instrument characterization data file

       out    output raw data file

       outType
              output file type (1=byte,4=float)

       near_range
              near range to which to align all lines (0=use first line near range)

       Notes:

       out is a complex file with no  headers  (byte/float  I1,  byte/float  Q1,  byte/float  I2,
       byte/float Q2, ...)

       if  outType  is  byte,  then the decoded floats are multiplied by 127.5, shifted by 127.5,
       rounded to the nearest integer and limited to the range 0-255

       starting range computed as (rank*pri+windowStartTime)*c/2 where rank is the number of  pri
       between transmitted pulse and return echo

       calibration/noise lines are replaced with previous echo data line

       missing lines within a data set and between adjacent along-track data sets are filled with
       zeroes in float mode and 0.*127.5+127.5 + .5 = 128 for byte mode

       auxiliary data files can be found at http://envisat.esa.int/services/auxiliary_data/asar/

       Envisat  ASAR  Product  Handbook,  Issue  1.1,  1  December   2002   can   be   found   at
       http://envisat.esa.int/dataproducts/asar/CNTR6-3-6.htm#eph.asar.asardf.0pASA_IM__0P