[GRASS-user] Rotating raster maps

[Daniel Victoria]

Some satellite images comes rotated, with black borders. But if we rotate
them prior to patching, we mess up the georeferencing. The process then is
setting those borders to null and then patching.

If this is your case, then I'd try running `r.null` to set those borders as
no-data and then use `r.patch`.

But again, not sure if this is your case

Cheers

On Wed, Jul 18, 2018 at 12:06 PM Rich Shepard <rshepard at appl-ecosys.com>
wrote:

> On Wed, 18 Jul 2018, Daniel Victoria wrote:
>
> > But are those tif images? Or GeoTiff? Because, if those are geotiffs,
> with
> > correct georeferencing, I believe rotating will mess things up.
>
> Daniel,
>
>    Probably GeoTIFF. If rotating is not the solution is there another way
> to
> patch them together without thin wedges?
>
> Regards,
>
> Rich
>
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