|Seismic data set to be imaged|
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.
-Jalon0/lat0[/horizon]/scale (Lambert Azimuthal Equal-Area)
-Jp[a]scale[/origin][r|z] (Polar coordinates (theta,r))
|-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, 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 viewpoints 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-order). -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 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 Selects Overlay plot mode [Default initializes a new plot system]. -P Selects Portrait plotting mode [Default is Landscape, see gmtdefaults to change this]. -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 "silently"]. -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 > segy.ps
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 4.5.14||PSSEGYZ (1)||1 Nov 2015|