grid

Names of 2-D binary grid files to be converted. (See GRID FILE FORMATS below.)

-C[f|i]

Replace the x- and y-coordinates on output with the corresponding column and row numbers. These start at 0 (C-style counting); append f to start at 1 (Fortran-style counting). Alternatively, append i to write just the two columns index and z, where index is the 1-D indexing that GMT uses when referring to grid nodes.

-Rxmin/xmax/ymin/ymax[+r][+uunit] (more ...)

Specify the region of interest. Using the -R option will select a subsection of the grid. If this subsection exceeds the boundaries of the grid, only the common region will be output.

-V[level] (more ...)

Select verbosity level [c].

-W[a|weight]

Write out x,y,z,w, where w is the supplied weight (or 1 if not supplied) [Default writes x,y,z only]. Choose -Wa to compute weights equal to the area each node represents.

-Z[flags]

Write a 1-column ASCII [or binary] table. Output will be organized according to the specified ordering convention contained in flags. If data should be written by rows, make flags start with T (op) if first row is y = ymax or B (ottom) if first row is y = ymin. Then, append L or R to indicate that first element should start at left or right end of row. Likewise for column formats: start with L or R to position first column, and then append T or B to position first element in a row. For gridline registered grids: If grid is periodic in x but the written data should not contain the (redundant) column at x = xmax, append x. For grid periodic in y, skip writing the redundant row at y = ymax by appending y. If the byte-order needs to be swapped, append w. Select one of several data types (all binary except a):

Default format is scanline orientation of ASCII numbers: -ZTLa. Note that -Z only applies to 1-column output.

-bo[ncols][type] (more ...)

Select native binary output. [Default is 3]. This option only applies to xyz output; see -Z for z table output.

-d[i|o]nodata (more ...)

Replace input columns that equal nodata with NaN and do the reverse on output.

-f[i|o]colinfo (more ...)

Specify data types of input and/or output columns. See also TIME COORDINATES below. -h Output 1 header record based on information in the first grid file header. Ignored if binary output is selected. [Default is no header].

-ocols[,...] (more ...)

Select output columns (0 is first column).

-s[cols][a|r] (more ...)

Set handling of NaN records.

-^ 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.