GRDPASTE(1) Generic Mapping Tools GRDPASTE(1)NAMEgrdpaste - Paste together two .grd files along a common edge.
SYNOPSISgrdpaste file_a.grd file_b.grd -Goutfile.grd [ -V ] [ -f[i|o]colinfo ]
DESCRIPTIONgrdpaste will combine file_a.grd and file_b.grd into outfile.grd by
pasting them together along their common edge. Files file_a.grd and
file_b.grd must have the same dx, dy and have one edge in common. If
in doubt, check with grdinfo and use grdcut and/or grdsample if neces‐
sary to prepare the edge joint. For geographical grids, use -f to han‐
dle periodic longitudes.
file_a.grd
One of two files to be pasted together.
file_b.grd
The other of two files to be pasted together.
-Goutfile.grd
The name for the combined output.
OPTIONS-V Selects verbose mode, which will send progress reports to stderr
[Default runs "silently"].
-f Special formatting of input and/or output columns (time or geo‐
graphical data). Specify i or o to make this apply only to
input or output [Default applies to both]. Give one or more
columns (or column ranges) separated by commas. Append T (abso‐
lute calendar time), t (relative time in chosen TIME_UNIT since
TIME_EPOCH), x (longitude), y (latitude), or f (floating point)
to each column or column range item. Shorthand -f[i|o]g means
-f[i|o]0x,1y (geographic coordinates).
GRID FILE FORMATS
By default GMT writes out grid as single precision floats in a COARDS-
complaint netCDF file format. However, GMT is able to produce grid
files in many other commonly used grid file formats and also facili‐
tates so called "packing" of grids, writing out floating point data as
2- or 4-byte integers. To specify the precision, scale and offset, the
user should add the suffix =id[/scale/offset[/nan]], where id is a two-
letter identifier of the grid type and precision, and scale and offset
are optional scale factor and offset to be applied to all grid values,
and nan is the value used to indicate missing data. When reading
grids, the format is generally automatically recognized. If not, the
same suffix can be added to input grid file names. See grdreformat(1)
and Section 4.17 of the GMT Technical Reference and Cookbook for more
information.
When reading a netCDF file that contains multiple grids, GMT will read,
by default, the first 2-dimensional grid that can find in that file. To
coax GMT into reading another multi-dimensional variable in the grid
file, append ?varname to the file name, where varname is the name of
the variable. Note that you may need to escape the special meaning of ?
in your shell program by putting a backslash in front of it, or by
placing the filename and suffix between quotes or double quotes. The
?varname suffix can also be used for output grids to specify a variable
name different from the default: "z". See grdreformat(1) and Section
4.18 of the GMT Technical Reference and Cookbook for more information,
particularly on how to read splices of 3-, 4-, or 5-dimensional grids.
EXAMPLES
Suppose file_a.grd is 150E - 180E and 0 - 30N, and file_b.grd is 150E -
180E, -30S - 0, then you can make outfile.grd which will be 150 - 180
and -30S - 30N by:
grdpaste file_a.grd file_b.grd -G outfile.grd -V -fg
SEE ALSOGMT(1), grdcut(1), grdinfo(1), grdsample(1)GMT 4.5.14 1 Nov 2015 GRDPASTE(1)
