Provided by: gmt_4.5.11-1build1_amd64 bug


       pssegy - Create imagemasked postscript from SEGY file


       pssegy  SEGYfile  -Jparameters  -Rwest/east/south/north[r]  -Ddeviation  -F[rgb|gray]|-W [
       -Bbias ] [ -Cclip ] [ -Eerror ] [ -I ] [ -K ] [ -Lnsamp ] [ -Mntrace ] [ -N ] [ -O ] [  -P
       ] [ -Sheader ] [ -Tfilename ] [ -Uredvel ] [ -V ] [ -Xscale ] [ -Ysample int ] [ -Z ]


       pssegy  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.  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 access)

              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.

              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).

       -E     Allow error difference between requested and actual trace locations when  using  -T

       -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,
              or  b<num>  to  read  a  long  starting  at  byte  <num>  in the header (first byte
              corresponds to num=0). Default has location given by trace number.

       -T     Plot only traces whose location corresponds to a list given in filename.  Order  in
              which  traces  are listed is not significant - the entire space is checked for each

       -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

       pssegy wa1.segy -JX 5/-5 -R 0/100/0/10 -D 1 -C 3 -N -S o -W -F black >

       To plot the SEGY file wa1.segy with traces plotted at true cdp*0.1, clipped at  +-3,  with
       bias -1 and negative variable area shaded red, use

       pssegy wa1.segy -JX 5/-5 -R 0/100/0/10 -D 1 -C 3 -S c -X 0.1 -F red -B-1 -I >


       GMT(1), pssegyz(1)