SEGZ-Format-Definition-V1
# ARAM-AIRES SEG-Y (Rev 0) DISK format Software version 3
# NOTE: ARAM tape format = Big Endian, ARAM disk format = Little Endian 
# The preceding line is a mandatory identifier.
# It "has" to be the first line of the file or the file is not valid.

 SECTION SEGZ-parameters
# SECTION is the keyword identifier for the beginning of a section
# Comment - This header defines a normal SEGY file
  Name,            Length, Description
  Textual-header,    3200, SEGY Rev(0) Default length of character line header (bytes)
  File-header,        400, Length of binary line header (bytes)
  Trace-header,       240, Length of trace header (bytes)
  TRACE_SAMP_FORMAT,IEEE4, Number format
  Endianess,        ITTLE, Little for PC
 ENDSECTION

 SECTION File-header-definition
# ARAM SEGY format
  Name,                     Byte,Type,Vector,Scalar,Addend,Description
  JOB,                         1,INT4,1,1,0,Job Identification number
  REEL,                        9,INT4,1,1,0,Reel Number
  N_DATA,                     13,INT2,1,1,0,Number of data traces per record
  N_AUX,                      15,INT2,1,1,0,Number of Auxiliary Traces per File
  FILE_SAMP_RATE,             17,INT2,1,1,0,Sample Interval
  FILE_SAMP_NUM,              21,INT2,1,1,0,Number of data samples per trace or the maximum number of Samples
  TRACE_SAMP_FORMAT,          25,INT2,1,1,0,Data sample format code 5=IEEE for ARAM disk, 1=IBM for ARAM tape
  CDP_FOLD,                   27,INT2,1,1,0,Expected CDP fold
  NUM_COMPOSITES,             31,INT2,1,1,0,Number of Composites ARAM
  FH_SWEEP_START,             33,INT2,1,1,0,Sweep Frequency at start
  FH_SWEEP_END,               35,INT2,1,1,0,End sweep Frequency
  FH_SWEEP_LENGTH,            37,INT2,1,1,0,Sweep length in milliseconds
  FH_SWEEP_TYPE,              39,INT2,1,1,0,0=n/a 1-linear 2 = parabolic 3=exponential 4 = other
  FH_SWEEP_CHAN ,             41,INT2,1,1,0,Trace number of sweep channel
  FH_SWEEP_TAPER_START,       43,INT2,1,1,0,Initial sweep trace taper length
  FH_SWEEP_TAPER_END,         45,INT2,1,1,0,Final sweep trace taper length
  FH_SWEEP_TAPER_TYPE,        47,INT2,1,1,0,Sweep taper type
  FH_CORRELATED,              49,INT2,1,1,0,1=NOT correlated 2=correlated
  LENGTH_SYS,                 55,INT2,1,1,0,1=metres 2=feet
  POLARITY,                   57,INT2,1,1,0,1: upward geophone case movement gives a negative number in the trace
  VIB_POLARITY_CODE,          59,INT2,1,1,0,Vibratory polarity code
  NUM_TRACES,                 61,INT2,1,1,0,Number of traces in file
 ENDSECTION

 SECTION Trace-header-definition
  Name,Byte,Type,Vector,Scalar,Addend,Description
  ITRACE_LINE,             1,INT4,1,1,0,Trace sequence no within project/line
  ITRACE_FILE,             5,INT4,1,1,0,Trace sequence no within this file
  FILE_NUMBER,             9,INT4,1,1,0,Original field record number
  TRACE_NUMBER,           13,INT4,1,1,0,ARAM Trace number within original field record ARAM  
  SOURCE_POINT,           17,INT4,1,1,0,Energy source point number (shot peg)
  REEL_ID,                21,INT4,1,1,0,Energy source point number (shot peg)
  TRTYPE,                 29,INT2,1,1,0,Trace id code 1=data 2=dead 3=dummy 4=time break 5=uphole
  VERT_NSUM,              31,INT2,1,1,0,No of vertically summed traces (composites) in this trace
  HORI_NSUM,              33,INT2,1,1,0,No of horizontally summed traces in this trace
  DATA_USE,               35,INT2,1,1,0,Data use. 1=production 2=test
  OFFSET,                 37,INT4,1,1,0,Distance from source point to receiver group
  SOURCE_UPHOLE_TIME,     95,INT2,1,1,0,ARAM Uphole time at source [ms] or 1/10 ms for ARAM
  SAMP_NUM,              115,INT2,1,1,0,Number of samples in this trace
  SAMP_RATE,             117,INT2,1,1,0,Sample rate for this trace
  CORRELATED,            125,INT2,1,1,0,Correlated 1=no 2=yes
  YEAR,                  157,INT2,1,1,0,Year
  JULIAN_DAY,            159,INT2,1,1,0,Day of the Year
  HOUR,                  161,INT2,1,1,0,Hour of the day
  MINUTE,                163,INT2,1,1,0,Minute of the day
  SECOND,                165,INT2,1,1,0,Second of the minute
  TIME_BASE,             167,INT2,1,1,0,Time basis code : 1=local 2=GMT 3=other 4=UTC
  RECEIVER_FLAG_NUM,     181,INT4,1,1,0,ARAM receiver flag number
  SOURCE_LINE_NAME,      189,ASCII,14,1,0,ARAM source line name
  SOURCE_POINT_FRACTION, 207,INT2,1,1,0,ARAM
  RECEIVER_LINE_NAME,    209,ASCII,14,1,0,ARAM receiver line name
  SOURCE_POINT_INDEX,    223,INT1,1,1,0,Source Point Index ARAM
  RECEIVER_LINE_NUM,     225,INT4,1,1,0,ARAM receiver line name
  SOURCE_LINE_NUM,       229,INT4,1,1,0,ARAM source line name
 ENDSECTION
ENDSEGZ
ENDFILE