## NAME

          hotspotter - Create CVA image from seamount flowlines

## SYNOPSIS

          hotspotter [infile(s)] -Estage_file -GCVAgrid -Ix_inc[m|c][/y_inc[m|c]]
          -Rwest/east/south/north[r] [ -F ] [ -H[nrec] ] [ -Nupper_age ] [ -T ] [
          -V ] [ -: ] [ -bi[s][n] ]

## DESCRIPTION

          hotspotter reads (longitude, latitude, amplitude, radius, age) records
          from infiles  [or standard input] and calculates flowlines using the
          specified stage pole (Euler) rotations.  These flowlines are convolved
          with the shape of the seamount (using a Gaussian shape given amplitude
          and radius = 6 sigma) and added up to give a Cumulative Volcano
          Amplitude grid (CVA).  See option -: on how to read
          (latitude,longitude,...) files.
               No space between the option flag and the associated arguments.
          Use upper case for the option flags and lower case for modifiers.

          infile(s)
               Data file(s) to be processed.  If not given, standard input is
               read.

          -E   Give file with stage poles and opening angles.  This file must
               contain one record for each stage; each record must be of the
               following format:

                    lon lat tstart tstop ccw-angle

               where time is in Ma and the rest is in degrees.  Oldest stage
               must be listed first.  tstart is the time when the stage begins
               (oldest age).  Blank lines and records whose first column
               contains # will be ignored.

## OPTIONS

          -F   Force pixel registration [Default is grid registration].

          -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.

          -N   Set the upper age to assign seamounts whose crustal age is
               unknown (i.e. NaN) [no upper age].

          -T   Truncate seamount ages exceeding the upper age set with -N [no
               truncation].

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

          -:   Toggles between (longitude,latitude) and (latitude,longitude)
               input/output.  [Default is (longitude,latitude)].

          -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 5 input columns]

## EXAMPLES

          To create a CVA image from the Pacific (x,y,z,r,t) data in the file
          seamounts.d, using the DC85.d Euler poles, run

          hotspotter seamounts.d -EDC85.d -GCVA.grd -R130/260/-66/60 -I10m -N145
          -T -V

          This file can then be plotted with grdimage.

## SEE ALSO

          gmt, grdimage, project, mapproject, backtracker

## REFERENCES

          Wessel, P., 1999, "Hotspotting" tools released, EOS Trans. AGU, 80
          (??), p. ??.