GRDPASTE(1gmt)
NAME
grdpaste - Paste together two .grd files along a common edge.
SYNOPSIS
grdpaste file_a.grd file_b.grd -Goutfile.grd [ -V ]
DESCRIPTION
grdpaste 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 necessary to prepare the edge joint.
- 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"].
GRID FILE FORMATS
By default GMT writes out grid as single precision floats in a COARDScomplaint netCDF file format. However, GMT is able to produce grid
files in many other commonly used grid file formats and also facilitates 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 twoletter 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 -Goutfile.grd -V