Provided by: gmt_4.5.11-1build1_amd64 bug


       pssegyz - Create imagemasked postscript from SEGY file


       pssegyz   SEGYfile   -Jparameters  -Jz|Zparameters  -Rwest/east/south/north[/zmin/zmax][r]
       -Ddeviation -F[rgb|gray]|-W [ -Bbias ] [ -Cclip ] [ -Eazim/elev[+wlon/lat[/z]][+vx0/y0]  ]
       [  -I  ]  [  -K  ] [ -Lnsamp ] [ -Mntrace ] [ -N ] [ -O ] [ -P ] [ -Sheader_x/header_y ] [
       -Uredvel ] [ -V ] [ -Xscale ] [ -Ysample_int ] [ -Z ]


       pssegyz reads a native (IEEE) format SEGY file and produces  a  PostScript  image  of  the
       seismic  data.  The  imagemask  operator is used so that the seismic data are plotted as a
       1-bit deep bitmap in a single (user-specified) color or gray  shade,  with  a  transparent
       background.   The  bitmap  resolution is taken from the current GMT defaults.  The seismic
       traces may be plotted at their true locations using information in the trace  headers  (in
       which  case  order  of  the traces in the file is not significant).  Standard GMT geometry
       routines are used so that in principle any map projection  may  be  used,  however  it  is
       likely  that  the geographic projections will lead to unexpected results. Beware also that
       some parameters have non-standard meanings, and a couple of the options for pssegy are not
       available  in  pssegyz.   Note  that  the  order of operations before the seismic data are
       plotted is deviation*[clip]([bias]+[normalize](sample value)).  Deviation  determines  how
       far  in  the plot coordinates a [normalized][biased][clipped] sample value of 1 plots from
       the trace location.  The SEGY file should be a disk image of the tape format (ie 3200 byte
       text  header,  which is ignored, 400 byte binary reel header, and 240 byte header for each
       trace) with samples as native real*4 (IEEE real on all  the  platforms  to  which  I  have

              Seismic data set to be imaged

       -J     Selects  the map projection. Scale is UNIT/degree, 1:xxxxx, or width in UNIT (upper
              case modifier).  UNIT is cm, inch, or m, depending on the MEASURE_UNIT  setting  in
              .gmtdefaults4, but this can be overridden on the command line by appending c, i, or
              m to the scale/width value.  When central meridian is optional, default  is  center
              of  longitude  range  on -R option.  Default standard parallel is the equator.  For
              map height, max dimension, or min dimension, append  h,  +,  or  -  to  the  width,
              More details can be found in the psbasemap man pages.


              -Jclon0/lat0/scale (Cassini)
              -Jcyl_stere/[lon0/[lat0/]]scale (Cylindrical Stereographic)
              -Jj[lon0/]scale (Miller)
              -Jm[lon0/[lat0/]]scale (Mercator)
              -Jmlon0/lat0/scale (Mercator - Give meridian and standard parallel)
              -Jo[a]lon0/lat0/azimuth/scale (Oblique Mercator - point and azimuth)
              -Jo[b]lon0/lat0/lon1/lat1/scale (Oblique Mercator - two points)
              -Joclon0/lat0/lonp/latp/scale (Oblique Mercator - point and pole)
              -Jq[lon0/[lat0/]]scale (Cylindrical Equidistant)
              -Jtlon0/[lat0/]scale (TM - Transverse Mercator)
              -Juzone/scale (UTM - Universal Transverse Mercator)
              -Jy[lon0/[lat0/]]scale (Cylindrical Equal-Area)

              CONIC PROJECTIONS:

              -Jblon0/lat0/lat1/lat2/scale (Albers)
              -Jdlon0/lat0/lat1/lat2/scale (Conic Equidistant)
              -Jllon0/lat0/lat1/lat2/scale (Lambert Conic Conformal)
              -Jpoly/[lon0/[lat0/]]scale ((American) Polyconic)


              -Jalon0/lat0[/horizon]/scale (Lambert Azimuthal Equal-Area)
              -Jelon0/lat0[/horizon]/scale (Azimuthal Equidistant)
              -Jflon0/lat0[/horizon]/scale (Gnomonic)
              -Jglon0/lat0[/horizon]/scale (Orthographic)
              -Jglon0/lat0/altitude/azimuth/tilt/twist/Width/Height/scale (General Perspective).
              -Jslon0/lat0[/horizon]/scale (General Stereographic)


              -Jh[lon0/]scale (Hammer)
              -Ji[lon0/]scale (Sinusoidal)
              -Jkf[lon0/]scale (Eckert IV)
              -Jk[s][lon0/]scale (Eckert VI)
              -Jn[lon0/]scale (Robinson)
              -Jr[lon0/]scale (Winkel Tripel)
              -Jv[lon0/]scale (Van der Grinten)
              -Jw[lon0/]scale (Mollweide)


              -Jp[a]scale[/origin][r|z] (Polar coordinates (theta,r))
              -Jxx-scale[d|l|ppow|t|T][/y-scale[d|l|ppow|t|T]] (Linear, log, and power scaling)

       -R     west,  east,  south,  and north specify the Region of interest, and you may specify
              them in decimal degrees or in  [+-]dd:mm[][W|E|S|N]  format.   Append  r  if
              lower  left  and upper right map coordinates are given instead of w/e/s/n.  The two
              shorthands -Rg and -Rd stand for global domain (0/360 and  -180/+180  in  longitude
              respectively,  with  -90/+90  in  latitude).  Alternatively, specify the name of an
              existing grid file and the -R settings (and grid spacing, if applicable) are copied
              from the grid.

       -D     gives the deviation in X units of the plot for 1.0 on the scaled trace, This may be
              a single number (applied equally in X and Y directions) or devX/devY

       -E     Sets the viewpoint's azimuth and elevation (for perspective  view)  [180/90].   For
              frames  used for animation, you may want to append + to fix the center of your data
              domain (or specify a particular world coordinate point with  +wlon0/lat[/z])  which
              will  project  to  the  center of your page size (or specify the coordinates of the
              projected view point with +vx0/y0).

              Fill trace (variable area, defaults to filling positive). rgb  or  gray  gives  the
              color with which the imagemask is filled.

       -W     Draw wiggle trace.

       You must specify at least one of -W and -F.


       No space between the option flag and the associated arguments.

       -A     Flip  the  default  byte-swap  state  (default  assumes data have a bigendian byte-

       -B     Bias to apply to data (added to sample values).

       -C     Sample value at which to clip data  (clipping  is  applied  to  both  positive  and
              negative values).

       -I     Fill negative rather than positive excursions.

       -K     More PostScript code will be appended later [Default terminates the plot system].

       -L     Override  number of samples per trace in reel header (program attempts to determine
              number of samples from each trace header if possible to allow for  variable  length

       -M     Override  number  of  traces  specified in reel header. Program detects end of file
              (relatively) gracefully, but this  parameter  limits  number  of  traces  that  the
              program attempts to read.

       -N     Normalize trace by dividing by rms amplitude over full trace length.

       -O     Selects Overlay plot mode [Default initializes a new plot system].

       -P     Selects  Portrait  plotting  mode  [Default is Landscape, see gmtdefaults to change

       -S     Read trace locations from trace headers: header is either c for CDP, o for  offset,
              b<num>  to read a long starting at byte <num> in the header (first byte corresponds
              to num=0), or a number to fix the location.
               First parameter for x, second for y. Default has X and Y given by trace number.

       -U     Apply reduction velocity by shifting traces upwards by  redvel/|offset|.   Negative
              velocity  removes  existing  reduction.  Units  should be consistent with offset in
              trace header and sample interval.

       -V     Selects verbose mode, which will send progress  reports  to  stderr  [Default  runs

       -X     Multiply trace locations by scale before plotting.

       -Y     Override sample interval in reel header.

       -Z     Do not plot traces with zero rms amplitude.


       To  plot  the  SEGY file wa1.segy with normalized traces plotted at true offset locations,
       clipped at +-3 and with wiggle trace and positive variable area shading in black, use

       pssegyz wa1.segy -JX 5/-5 -D 1 -Jz 0.05 -E 180/5 -R 0/100/0/10/0/10 -C 3 -N  -S  o  -W  -F
       black >


       Variable  area involves filling four-sided figures of distressing generality.  I know that
       some of the more complex degenerate cases are not dealt with  correctly  or  at  all;  the
       incidence  of such cases increases as viewing angles become more oblique, and particularly
       as the viewing elevation increases. Wiggle-trace plotting is not affected.


       GMT(1), pssegy(1)