grdseamount — GMT 5.1.1 documentation

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# grdseamount

grdseamount - Compute synthetic seamount (Gaussian or cone, circular or elliptical) bathymetry

## Synopsis

grdseamount [ intable ] -Ixinc[unit][=|+][/yinc[unit][=|+]] -R[unit]xmin/xmax/ymin/ymax[r] [ -A[out/in] ] [ -C ] [ -E ] [ -Ggrdfile ] [ -L[cut] ] [ -Nnorm ] [ -Sscale ] [ -T[flattening] ] [ -Zlevel ] [ -V[level] ] [ -bi[ncols][type][w][+L|+B] ] [ -fg ] [ -icols[l][sscale][ooffset][,...] ] [ -r ]

Note: No space is allowed between the option flag and the associated arguments.

## Description

grdseamount will compute the bathymetry for synthetic seamounts given their shape parameters. We read a list with seamount locations and sizes and can evaluate either Gaussian or conical shapes, which may be circular or elliptical, and optionally truncated. Various scaling options are available to modify the result, including an option to add in a background depth. The input must contain lon, lat, radius, height for each seamount. For elliptical features (-E) we expect lon, lat, azimuth, semi-major, semi-minor, radius, height instead. If flattening is specified (-T) then a final column with flattening is expected.

## Required Arguments

-Ixinc[unit][=|+][/yinc[unit][=|+]]
  x_inc [and optionally y_inc] is the grid spacing. Optionally, append a suffix modifier. Geographical (degrees) coordinates: Append m to indicate arc minutes or s to indicate arc seconds. If one of the units e, f, k, M, n or u is appended instead, the increment is assumed to be given in meter, foot, km, Mile, nautical mile or US survey foot, respectively, and will be converted to the equivalent degrees longitude at the middle latitude of the region (the conversion depends on PROJ_ELLIPSOID). If /y_inc is given but set to 0 it will be reset equal to x_inc; otherwise it will be converted to degrees latitude. All coordinates: If = is appended then the corresponding max x (east) or y (north) may be slightly adjusted to fit exactly the given increment [by default the increment may be adjusted slightly to fit the given domain]. Finally, instead of giving an increment you may specify the number of nodes desired by appending + to the supplied integer argument; the increment is then recalculated from the number of nodes and the domain. The resulting increment value depends on whether you have selected a gridline-registered or pixel-registered grid; see B. GMT File Formats for details. Note: if -Rgrdfile is used then the grid spacing has already been initialized; use -I to override the values.

-R[unit]xmin/xmax/ymin/ymax[r] (more ...)
  Specify the region of interest.

## Optional Arguments

-A[out/in]
  Build a mask grid, append outside/inside values [1/NaN]. Here, height is ignored and -L, -N and -Z are disallowed
-C
  Cone model [Default is Gaussian].
-E
  Elliptical data format [Default is Circular]. Read lon, lat, azimuth, major, minor, height (m) for each seamount.
-Goutgrid
  Sets name of output gridfile.
-L[cut]
  List area, volume, and mean height for each seamount; NO grid is created. Optionally, append the noise-floor cutoff level [0].
-Nnorm
  Normalize grid so maximum grid height equals norm.
-Sscale
  Sets optional scale factor for radii [1].
-T[flattening]
  Seamounts are to be truncated. Append flattening, otherwise we expect it in last input column [no truncation].
-Zlevel
  Add in background depth [0].

-bi[ncols][type] (more ...)
  Select binary input. [Default is 3 input columns]. This option only applies to xyz input files; see -Z for z tables.
-fg
  Geographic grids (dimensions of longitude, latitude) will be converted to km via a “Flat Earth” approximation using the current ellipsoid parameters.

-h[i|o][n][+c][+d][+rremark][+rtitle] (more ...)
  Skip or produce header record(s). Not used with binary data.

-icols[l][sscale][ooffset][,...] (more ...)
  Select input columns.

-V[level] (more ...)
  Select verbosity level [c].

-r (more ...)
  Set pixel node registration [gridline].

-:[i|o] (more ...)
  Swap 1st and 2nd column on input and/or output.

-^
  Print a short message about the syntax of the command, then exits (NOTE: on Windows use just -).
+
  Print an extensive usage (help) message, including the explanation of any module-specific option (but not the GMT common options), then exits.
-?
  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 be added.

## See Also

gmt.conf, gmt, grdmath, gravfft

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