GRDSAMPLE
Section: Misc. Reference Manual Pages (l)
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NAME
grdsample - Resample a grd file onto a new grid
SYNOPSIS
grdsample in_grdfile -Gout_grdfile [ -F ] [ -Idx[m|c][/dy[m|c]] ]
[ -L ] [ -Nnx/ny ] [ -Q ] [ -Rwest/east/south/north[r] ] [ -T ] [ -V ]
DESCRIPTION
grdsample reads a 2-D binary grd file and resamples it on a new grid
specified by either a new number of nodes or a new grid-spacing. A sub-region may also
be selected. A bicubic [Default] or bilinear interpolation
is used to sample the grid. Free
boundary conditions are assumed (curvature and 3rd normal derivative is zero). grdsample
is mostly used to resample a grid onto a finer grid. Going the other way will
introduce aliasing and is better done using grdfft or grdfilter.
- in_grdfile
-
The name of the input 2-D binary grd file.
- -G
-
The name of the output grd file.
OPTIONS
No space between the option flag and the associated arguments.
- -F
-
Force pixel registration. [Default is grid registration].
- -I
-
Sets the new grid spacing. Append m for minutes, or c for seconds.
- -L
-
Indicates that the input grdfile is a geographical grid.
- -Q
-
Quick mode, use bilinear rather than bicubic interpolation.
#include "explain_-R.txt"
- -T
-
Translates between pixel registration and gridline registration. If input data
is gridline registered, then output will be a pixel grid, and vice versa. The
input file's -R and -I are used so no other options are necessary
(except possibly -Q).
#include "explain_-V.txt"
EXAMPLES
To resample the 5 x 5 minute grid in hawaii_5by5_topo.grd onto a 1 minute grid, try
grdsample hawaii_5by5_topo.grd -I1m -Ghawaii_1by1_topo.grd
To translate the gridline-registered file surface.grd to pixel registration, try
grdsample surface.grd -T -Gpixel.grd
SEE ALSO
gmt, grdfft, grdfilter
#include "refs.i"
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- EXAMPLES
-
- SEE ALSO
-
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