Provided by: gmt-common_5.2.1+dfsg-3build1_all 
NAME
pssegy - Plot a SEGY file on a map
SYNOPSIS
pssegy SEGYfile parameters region deviation [color] [ clip ] [ error ] [ ] [ ] [ nsamp ] [ ntrace ] [
] [ ] [ ] [ <mode><value> ] [ header ] [ filename ] [ [just/dx/dy/][c|label] ] [ [level] ] [ x_offset ]
[ y_offset ] [ -p<flags> ] [ -t<transp> ]
Note: No space is allowed between the option flag and the associated arguments.
DESCRIPTION
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 (i.e., 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).
REQUIRED ARGUMENTS
SEGYfile
Seismic SEGY data set to be imaged.
-Jparameters (more ...)
Select map projection.
-R[unit]west/east/south/north[/zmin/zmax][r]
west, east, south, and north specify the region of interest, and you may specify them in decimal
degrees or in [+-]dd:mm[:ss.xxx][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 for grid
creation, give Rcodelon/lat/nx/ny, where code is a 2-character combination of L, C, R (for left,
center, or right) and T, M, B for top, middle, or bottom. e.g., BL for lower left. This indicates
which point on a rectangular region the lon/lat coordinate refers to, and the grid dimensions nx
and ny with grid spacings via -I is used to create the corresponding region. Alternatively,
specify the name of an existing grid file and the -R settings (and grid spacing, if applicable)
are copied from the grid. Using -Runit expects projected (Cartesian) coordinates compatible with
chosen -J and we inversely project to determine actual rectangular geographic region. For
perspective view (-p), optionally append /zmin/zmax. In case of perspective view (-p), a z-range
(zmin, zmax) can be appended to indicate the third dimension. This needs to be done only when
using the -Jz option, not when using only the -p option. In the latter case a perspective view of
the plane is plotted, with no third dimension.
-Ddeviation
gives the deviation in X units of the plot for 1.0 on the scaled trace.
-F[color]
Fill trace (variable area, defaults to filling positive). Specify the color with which the
imagemask is filled.
-W Draw wiggle trace.
You must specify at least one of -W and -F.
OPTIONAL ARGUMENTS
-A Flip the default byte-swap state (default assumes data have a bigendian byte-order).
-Cclip Sample value at which to clip data (clipping is applied to both positive and negative values).
-Eerror
Allow error difference between requested and actual trace locations when using -T option.
-I Fill negative rather than positive excursions.
-K (more ...)
Do not finalize the PostScript plot.
-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 traces).
-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 (more ...)
Append to existing PostScript plot.
-P (more ...)
Select "Portrait" plot orientation.
-Q<mode><value>
Can be used to change 5 different settings depending on mode:
-Qbbias to bias scaled traces (-Qb-0.1 subtracts 0.1 from values).
-Qidpi sets the dots-per-inch resolution of the image [300].
-Quredvel to apply reduction velocity (negative value removes reduction already present).
-Qxmult to multiply trace locations by mult.
-Qydy to override sample interval in SEGY reel header.
-Sheader
Read trace locations from trace headers: header is either c for CDP, o for offset, or bnum to read
a long starting at byte num in the header (first byte corresponds to num = 0). Default has
location given by trace number.
-Tfilename
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 trace.
-U[just/dx/dy/][c|label] (more ...)
Draw GMT time stamp logo on plot.
-V[level] (more ...)
Select verbosity level [c].
-X[a|c|f|r][x-shift[u]]
-Y[a|c|f|r][y-shift[u]] (more ...)
Shift plot origin.
-Z Do not plot traces with zero rms amplitude.
-p[x|y|z]azim/elev[/zlevel][+wlon0/lat0[/z0]][+vx0/y0] (more ...)
Select perspective view.
-t[transp] (more ...)
Set PDF transparency level in percent.
-^ or just -
Print a short message about the syntax of the command, then exits (NOTE: on Windows use just -).
-+ or just +
Print an extensive usage (help) message, including the explanation of any module-specific option
(but not the GMT common options), then exits.
-? or no arguments
Print a complete usage (help) message, including the explanation of options, then exits.
--version
Print GMT version and exit.
--show-datadir
Print full path to GMT share directory and exit.
EXAMPLES
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
gmt pssegy wa1.segy -JX5i/-5i -R0/100/0/10 -D1 -C3 -N -So -W -Fblack > segy.ps
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
gmt pssegy wa1.segy -JX5i/-5i -R0/100/0/10 -D1 -C3 -Sc -Qx0.1 -Fred -Qb-1 -I > segy.ps
SEE ALSO
gmt, pssegyz, segy2grd
COPYRIGHT
2015, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe