Re: Rotating a grid
Remko Scharroo <[email protected]>
| Newsgroups | gmane.comp.gis.gmt.user |
|---|---|
| Message-ID | <[email protected]> |
Hi Michael.
Probably the easiest way is the write out the grid to ascii, flip the x and y, and change the sign of one of the coordinates.
For example, if you have a grid.nc on the domain -R0/100/0/200 with spacing 1/2, then rotating 90º counterclockwise:
$ grd2xyz grid.nc | awk ‘{print -$2,$1,$3}’ | xyz2grd -R-200/0/0/100 -I2/1 -Gnewgrid.nc
With GMT5 you can even avoid using awk:
$ grd2xyz grid.nc | xyz2grd -R-200/0/0/100 -I2/1 -Gnewgrid.nc -i1s-1,0,2
Regards,
Remko
On 23 Nov 2013, at 19:07, Michael Anenburg <[email protected]> wrote:
> I have a grid with xy coordinates (not geographic, cartesian) and I want to rotate it 90 degrees, or find some way to display it rotated using grdimage.
> grdrotater does not seem like the solution I need, or maybe it is - I just don't know how to adapt it for cartesian coordinates.
> Any ideas?
>
> Michael.
>
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