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       pswiggle - Plot anomaly along track on a map


       pswiggle  xyz_files  -Jparameters  -Rwest/east/south/north[r]  -Zscale  [  -Aazimuth  ]  [
       -Btickinfo ] [ -Ccenter ] [ -Dgap ] [ -Eazimuth/elevation ] [ -Gfillrgb ] [ -H[nrec]  ]  [
       -Ifix_az  ]  [  -K  ] [ -M[flag] ] [ -N ] [ -O ] [ -P ] [ -S[x]lon0/lat0/length[units] ] [
       -Ttrack_pen ] [ -U[/dx/dy/][label] ] [ -V  ] [ -Wwiggle_pen ] [ -Xx-shift ] [ -Yy-shift  ]
       [ -ccopies ] [ -: ] [ -bi[s][n] ]


       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.

       files  List  one  or  more  file-names. If no files are given, pswiggle will read standard

       -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
              .gmtdefaults, but this can be overridden on the command line by appending the c, i,
              or m to the scale/width value.


              -Jclon0/lat0/scale (Cassini)
              -Jjlon0/scale (Miller)
              -Jmscale (Mercator - Greenwich and Equator as origin)
              -Jmlon0/lat0/scale (Mercator - Give meridian and standard parallel)
              -Joalon0/lat0/azimuth/scale (Oblique Mercator - point and azimuth)
              -Joblon0/lat0/lon1/lat1/scale (Oblique Mercator - two points)
              -Joclon0/lat0/lonp/latp/scale (Oblique Mercator - point and pole)
              -Jqlon0/scale (Equidistant Cylindrical Projection (Plate Carree))
              -Jtlon0/scale (TM - Transverse Mercator, with Equator as y = 0)
              -Jtlon0/lat0/scale (TM - Transverse Mercator, set origin)
              -Juzone/scale (UTM - Universal Transverse Mercator)
              -Jylon0/lats/scale (Basic Cylindrical Projection)


              -Jalon0/lat0/scale (Lambert).
              -Jelon0/lat0/scale (Equidistant).
              -Jflon0/lat0/horizon/scale (Gnomonic).
              -Jglon0/lat0/scale (Orthographic).
              -Jslon0/lat0/[slat/]scale (General Stereographic)

              CONIC PROJECTIONS:

              -Jblon0/lat0/lat1/lat2/scale (Albers)
              -Jdlon0/lat0/lat1/lat2/scale (Equidistant)
              -Jllon0/lat0/lat1/lat2/scale (Lambert)


              -Jhlon0/scale (Hammer)
              -Jilon0/scale (Sinusoidal)
              -Jk[f|s]lon0/scale (Eckert IV (f) and VI (s))
              -Jnlon0/scale (Robinson)
              -Jrlon0/scale (Winkel Tripel)
              -Jvlon0/scale (Van der Grinten)
              -Jwlon0/scale (Mollweide)


              -Jp[a]scale[/origin]  (polar  (theta,r)  coordinates,  optional  a for azimuths and
              offset theta [0])
              -Jxx-scale[l|ppow][/y-scale[l|ppow]] (Linear, log, and power scaling)
              More details can be found in the psbasemap manpages.

       -R     west, east, south, and north specify the Region of interest. To specify  boundaries
              in  degrees and minutes [and seconds], use the dd:mm[:ss] format. Append r if lower
              left and upper right map coordinates are given instead of wesn.

       -Z     Gives anomaly scale in data-units/distance-unit.


       No space between the option flag and the associated arguments.

       -A     Sets the preferred positive azimuth. Positive wiggles will "gravitate" towards that

       -B     Sets map boundary tickmark intervals. See psbasemap for details.

       -C     Subtract center from the data set before plotting [0].

       -D     Means  there is a data gap if 2 consecutive points are more than gap distance units
              apart. For longitude/latitude data gap is in km, else it is in the user's units.'

       -E     Sets the viewpoint's azimuth and elevation [180/90]'

       -G     Set fill of positive wiggles. [Default is black] Specify the shade (0-255) or color
              (r/g/b, each in 0-255).

       -H     Input  file(s)  has  Header  record(s).  Number of header records can be changed by
              editing your .gmtdefaults file. If used, GMT default is 1 header record.

       -I     Set a fixed azimuth projection for wiggles [Default uses  track  azimuth,  but  see

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

       -M     Multiple  segment file. Segments are separated by a record whose first character is
              flag.  [Default is '>'].

       -N     Paint negative wiggles instead of positive [Default].

       -bo    Selects binary output. Append s for single precision [Default is double].

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

       -S     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

       -T     Draw track [Default is no track]. Append pen attributes to use [Defaults:  width  =
              1, color = 0/0/0, texture = solid].

       -U     Draw  Unix  System time stamp on plot. User may specify where the lower left corner
              of the stamp should fall on the  page  relative  to  lower  left  corner  of  plot.
              Optionally,  append  a  label,  or c (which will plot the command string.). The GMT
              parameters  UNIX_TIME  and  UNIX_TIME_POS  can  affect  the  appearance;  see   the
              gmtdefaults man page for details.

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

       -W     Draw wiggle  outline  [Default  is  no  outline].  Append  pen  attributes  to  use
              [Defaults: width = 1, color = 0/0/0, texture = solid].

       -X -Y  Shift origin of plot by (x-shift,y-shift).  Prepend a for absolute coordinates; the
              default (r) will reset plot origin.

       -:     Toggles  between  (longitude,latitude)   and   (latitude,longitude)   input/output.
              [Default is (longitude,latitude)].  Applies to geographic coordinates only.

       -c     Specifies the number of plot copies. [Default is 1]

       -bi    Selects  binary input. Append s for single precision [Default is double].  Append n
              for the number of columns in the binary file(s).  [Default is 3 input columns].


       To plot the magnetic anomaly stored in the file track.xym along  track  @  1000  nTesla/cm
       (after  removing a mean value of 32000 Tesla), 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, try

       pswiggle  track.xym  -R-20/10/-80/-60  -JS0/90/15c -Z1000 -B5 -P -G255/0/0 -T0.25p/0/0/255
       -S1000 -V >


       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; }' | 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:

       gmtset D_FORMAT %.12lg
       awk '{ print NR, $0 }' | filter1d -Fb5 -N4/0 >

       and plot this data set instead.


       gmt(1gmt), filter1d(1gmt), psbasemap(1gmt), splitxyz(1gmt)

                                            1 Jan 2004                                PSWIGGLE(l)