Provided by: gmt-common_5.2.1+dfsg-3build1_all 
NAME
pswiggle - Plot z = f(x,y) anomalies along tracks
SYNOPSIS
pswiggle [ table ] parameters west/east/south/north[/zmin/zmax][r] scale [ azimuth ] [ [p|s]parameters ]
[ center ] [ [+|-|=]fill ] [ z|Zparameters ] [ fix_az ] [ ] [ ] [ -P ] [ [x]lon0/lat0/length[/units] ]
[ pen ] [ [just/dx/dy/][c|label] ] [ [level] ] [ pen ] [ x_offset ] [ y_offset ] [ -bi<binary> ] [
-ccopies ] [ -di<nodata> ] [ -f<flags> ] [ -g<gaps> ] [ -h<headers> ] [ -i<flags> ] [ -p<flags> ] [
-t<transp> ] [ -:[i|o] ]
Note: No space is allowed between the option flag and the associated arguments.
DESCRIPTION
pswiggle reads (x,y,z) triplets from files [or standard input] and plots z as a function of distance
along track. This means that two consecutive (x,y) points define the local distance axis, and the local z
axis is then perpendicular to the distance axis. The user may set a preferred positive anomaly plot
direction, and if the positive normal is outside the plus/minus 90 degree window around the preferred
direction, then 180 degrees are added to the direction. Either the positive or the negative wiggle may be
shaded. The resulting PostScript code is written to standard output.
REQUIRED ARGUMENTS
-Jparameters (more ...)
Select map projection.
-R[unit]xmin/xmax/ymin/ymax[r] (more ...)
Specify the region of interest.
For perspective view p, optionally append /zmin/zmax. (more ...)
-Zscale
Gives anomaly scale in data-units/distance-unit.
OPTIONAL ARGUMENTS
table One or more ASCII (or binary, see -bi[ncols][type]) data table file(s) holding a number of data
columns. If no tables are given then we read from standard input.
-Aazimuth
Sets the preferred positive azimuth. Positive wiggles will "gravitate" towards that direction.
-B[p|s]parameters (more ...)
Set map boundary intervals.
-Ccenter
Subtract center from the data set before plotting [0].
-G[+|-|=]fill
Set fill shade, color or pattern for positive and/or negative wiggles [Default is no fill].
Optionally, prepend + to fill positive areas (this is the default behavior). Prepend - to fill
negative areas. Prepend = to fill both positive and negative areas with the same fill.
-Ifix_az
Set a fixed azimuth projection for wiggles [Default uses track azimuth, but see -A].
-Jz|Zparameters (more ...)
Set z-axis scaling; same syntax as -Jx.
-K (more ...)
Do not finalize the PostScript plot.
-O (more ...)
Append to existing PostScript plot.
-P (more ...)
Select "Portrait" plot orientation.
-S[x]lon0/lat0/length[/units]
Draws a simple vertical scale centered on lon0/lat0. Use -Sx to specify cartesian coordinates
instead. length is in z units, append unit name for labeling. FONT_ANNOT_PRIMARY is used as font.
-Tpen Draw track [Default is no track]. Append pen attributes to use [Defaults: width = 0.25p, color =
black, style = solid].
-U[just/dx/dy/][c|label] (more ...)
Draw GMT time stamp logo on plot.
-V[level] (more ...)
Select verbosity level [c].
-Wpen
-bi[ncols][t] (more ...)
Select native binary input. [Default is 3 input columns].
-ccopies (more ...)
Specify number of plot copies [Default is 1].
-dinodata (more ...)
Replace input columns that equal nodata with NaN.
-f[i|o]colinfo (more ...)
Specify data types of input and/or output columns.
-g[a]x|y|d|X|Y|D|[col]z[+|-]gap[u] (more ...)
Determine data gaps and line breaks.
-h[i|o][n][+c][+d][+rremark][+rtitle] (more ...)
Skip or produce header record(s).
-icols[l][sscale][ooffset][,...] (more ...)
Select input columns (0 is first column).
-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.
-:[i|o] (more ...)
Swap 1st and 2nd column on input and/or output.
-^ 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 magnetic anomaly stored in the file track.xym along track @ 1000 nTesla/cm (after removing a
mean value of 32000 nTesla), using a 15-cm-wide Polar Stereographic map ticked every 5 degrees in
Portrait mode, with positive anomalies in red on a blue track of width 0.25 points, use
gmt pswiggle track.xym -R-20/10/-80/-60 -JS0/90/15c -Z1000 -B5 \
-C32000 -P -Gred -T0.25p,blue -S1000 -V > track_xym.ps
BUGS
Sometimes the (x,y) coordinates are not printed with enough significant digits, so the local
perpendicular to the track swings around a lot. To see if this is the problem, you should do this:
awk '{ if (NR > 1) print atan2(y-$1, x-$2); y=$1; x=$2; }' yourdata.xyz | more
(note that output is in radians; on some machines you need "nawk" to do this). Then if these numbers jump
around a lot, you may do this:
awk '{ print NR, $0 }' yourdata.xyz | filter1d -Fb5 -N4/0 \
--FORMAT_FLOAT_OUT=%.12g > smoothed.xyz
and plot this data set instead.
SEE ALSO
gmt, gmtcolors, filter1d, psbasemap, splitxyz
COPYRIGHT
2015, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe