NAME

     surface   - converts output of GLI3D to an XSD pick file.

SYNOPSIS

     surface [ -Nntap] [ -Ootap] [ -ddatum] [ -nznz]  [  -maxmax-
     ind] [ -iminimin] [ -imaximax] [ -nlaynlayers] [ -R] [ -C] [
     -G] [ -B] [ -Q] [ -iseediseed] [ '-?']

DESCRIPTION

     surface reads a report file  computed  by  GLI3D  (*.ele  or
     *.mlf)  that  contains weathering statics corrections, model
     coordinates, and model velocities;  and  outputs  XSD  picks
     delineating  the  topography  and  layers  of the refraction
     model.  Any missing groups are  interpolated  linearly  from
     its nearest neighbors.

     SURFACE gets data and parameters  from  command  line  argu-
     ments.  These arguments specify the input GLI file (*.ele or
     *.mlf), the output XSD file, the datum elevation, the  depth
     increment  for  a  corresponding migrated depth section, the
     maximum receiver station (DISCO input only), the min and max
     receiver  stations, the number of layers in the GLI model, a
     flag to reverse the plotting direction of the picks,  and  a
     flag to signify 3 or more layers in the model.

  Command line arguments
     -Nntap
          Enter the input GLI file name (*.ele or *.mlf)  immedi-
          ately after typing -N.

     -Ootap
          Enter the output XSD file name immediately after typing
          -O.

     -nznz
          Enter z depth increment after typing -nz.

     -maxmaxind
          Enter maximum receiver station (for DISCO  input  only)
          after typing -max.

     -iminimin
          Enter minimum receiver  station  to  use  after  typing
          -imin.

     -imaximax
          Enter maximum receiver  station  to  use  after  typing
          -imax.

     -nlaynlayers
          Enter number of layers in refraction model after typing
          -nlay (default=2).

     -R   Type -R to reverse the order of the picks.

     -C   Type -C to get  picks  at  cdp's  [number  of  picks  =
          2*(imax-imin) + 1].

     -G   Type -G for GLI input; otherwise we assume the data  is
          a DISCO file (*.mlf)

     -B   Type -B if the statics model contains 3 or more layers.

     -Q   Type -Q if the input gli3d file  came  from  the  batch
          (not  interactive)  gli3d  program.  Otherwise, SURFACE
          assumes the input from GLI3D was the newer  interactive
          program.

     -iseediseed
          Enter a seed value to add to all data value entries  in
          the  statics  file  to  prevent  any naturally occuring
          zeros from occuring.  The default value  is  -7777  and
          should  work  for all cases except where the value 7777
          occurs in the statics file.

     '-?' Enter '-?' to get online help. Program terminates after
          printing this.

BUGS

     I know, they're program redundancies.

AUTHOR

     Don Wagner, APR, 3281.

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved
          an affiliate of BP America Inc.