Provided by: gmt-common_5.4.3+dfsg-1_all 
NAME
gmtpmodeler - Evaluate a plate motion model at given locations
SYNOPSIS
gmtpmodeler table -Erot_file -Sflags [ -Fpolygonfile ] [ -Tage ] [ -V[level] ] [
-bbinary ] [ -dnodata ] [ -eregexp ] [ -hheaders ] [ -iflags ] [ -oflags ] [ -:[i|o] ]
Note: No space is allowed between the option flag and the associated arguments.
DESCRIPTION
gmtpmodeler reads a table with lon, lat and optionally age triplets and a plate motion
model and evaluates one of several model predictions. Optionally, the user may supply a
clipping polygon in multiple-segment format; then, only the part of the points inside the
polygon are used to determine the model prediction. The results are written to standard
output.
REQUIRED ARGUMENTS
table Name of one or more tables with geographical (lon, lat) coordinates and optionally
a third column with ages in Myr. If no file is given then we read from standard
input.
-Erotfile
Give file with rotation parameters. This file must contain one record for each
rotation; each record must be of the following format:
lon lat tstart [tstop] angle [ khat a b c d e f g df ]
where tstart and tstop are in Myr and lon lat angle are in degrees. tstart and
tstop are the ages of the old and young ends of a stage. If tstop is not present in
the record then a total reconstruction rotation is expected and tstop is implicitly
set to 0 and should not be specified for any of the records in the file. If a
covariance matrix C for the rotation is available it must be specified in a format
using the nine optional terms listed in brackets. Here, C = (g/khat)*[ a b d; b c
e; d e f ] which shows C made up of three row vectors. If the degrees of freedom
(df) in fitting the rotation is 0 or not given it is set to 10000. Blank lines and
records whose first column contains # will be ignored. You may prepend a leading +
to the filename to indicate you wish to invert the rotations. Alternatively, give
the filename composed of two plate IDs separated by a hyphen (e.g., PAC-MBL) and we
will instead extract that rotation from the GPlates rotation database. We return an
error if the rotation cannot be found.
-Sflags
Type of model prediction(s). Append one or more items: choose from a for plate
motion azimuth, d for great-circle distance between current location and its origin
at the ridge (in km), s for plate motion model stage ID (1 is youngest), v for
plate motion rate (in mm/yr), w for plate rotation rate (degree/Myr), x for change
in longitude relative to location of crust formation, y for change in latitude
relative to location of crust formation, X for longitude of crust formation, and Y
for latitude of crust formation. If no arguments are given we default to all
[adsvwxyXY].
OPTIONAL ARGUMENTS
-Fpolygonfile
Specify a multisegment closed polygon file that describes the area where the model
should be evaluated; points outside will be skipped [use all data points].
-Tage Use a fixed age for model evaluation (i.e., override the ages given in the input
table). This lets you evaluate the model at a snapshot in time, and is a required
option if the input table does not contain ages.
-V[level] (more …)
Select verbosity level [c].
-bi[ncols][t] (more …)
Select native binary input. [Default is 2 input columns].
-d[i|o]nodata (more …)
Replace input columns that equal nodata with NaN and do the reverse on output.
-e[~]”pattern” | -e[~]/regexp/[i] (more …)
Only accept data records that match the given pattern.
-h[i|o][n][+c][+d][+rremark][+rtitle] (more …)
Skip or produce header record(s).
-icols[+l][+sscale][+ooffset][,…] (more …)
Select input columns and transformations (0 is first column).
-ocols[,…] (more …)
Select output columns (0 is first column).
-^ or just -
Print a short message about the syntax of the command, then exits (NOTE: on Windows
just use -).
-+ 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 all options,
then exits.
GEODETIC VERSUS GEOCENTRIC COORDIINATES
All spherical rotations are applied to geocentric coordinates. This means that incoming
data points and grids are considered to represent geodetic coordinates and must first be
converted to geocentric coordinates. Rotations are then applied, and the final
reconstructed points are converted back to geodetic coordinates. This default behavior
can be bypassed if the ellipsoid setting PROJ_ELLIPSOID is changed to Sphere.
----
EXAMPLES
We will use a table with locations and ages of Pacific crust (pac_age.txt), a plate motion
model (Pac_APM.txt), and a polygon that contains the outline of the present Pacific plate
(pac_clip_path.txt). To evaluate the plate motion azimuths at the present time for the
Pacific, try
gmt gmtpmodeler pac_age.txt -EPac_APM.txt -V -Fpac_clip_path.txt \
-Sa -T0 > pac_dir_0.txt
To determine the changes in latitude since crust formation for the entire Pacific, try
gmt gmtpmodeler pac_age.txt -EPac_APM.txt -V -Fpac_clip_path.txt \
-Sy > pac_dlat.txt
To determine the plate motion velocities in effect when the Pacific crust was formed, try
gmt gmtpmodeler pac_age.txt -EPac_APM.txt -V -Fpac_clip_path.txt \
-Sv > pac_vel.txt
To determine how far the crust has moved since formation, try
gmt gmtpmodeler pac_age.txt -EPac_APM.txt -V -Fpac_clip_path.txt \
-Sd > pac_dist.txt
To save the coordinates of the crust’s formation, try
gmt gmtpmodeler pac_age.txt -EPac_APM.txt -V -Fpac_clip_path.txt \
-SXY > ac_origin_xy.txt
NOTES
GMT distributes the EarthByte rotation model Global_EarthByte_230-0Ma_GK07_AREPS.rot. To
use an alternate rotation file, create an environmental parameters named GPLATES_ROTATIONS
that points to an alternate rotation file.
SEE ALSO
backtracker, grdpmodeler, grdrotater, grdspotter, hotspotter, originator, rotconverter
COPYRIGHT
2018, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe