[GRASS-user] Merging Raster Files in GRASS

Vaclav Petras wenzeslaus at gmail.com
Wed Oct 10 19:59:03 PDT 2018

Just to clarify functionality for some of the modules.

On Wed, Oct 10, 2018 at 7:09 AM Mehrdad Varedi <varedi at gmail.com> wrote:

> *r.buildvrt *in version (7.4.0 and 7.4.1)generated the following error:
>             'r.buildvrt' is not recognized as an internal or external
> command, operable program or batch file.

Available only in 7.6 (future release) and above.

> I have tried *r.patch *which doesn't generate any error, although the
> created result is empty with no errors.

Likely the computation region as Vero says.

> *r.out.gdal* and using the grouping option to group the layers and export
> them to a new Tiff, although that had a similar output as r.patch.

The group r.out.gdal support is GRASS GIS imagery group created by i.group.
That's a GRASS GIS way of handling multiband images, or more precisely, a
way to organize fully overlapping rasters together as a collection of
spectral bands or related image processing outputs.

> A virtual raster file in QGIS was created using the 4 Tiff files and
> importing to grass using r.import, didn't work and I got errors.

 This should work. (Files and error messages would be needed to understand
what's wrong, but if r.patch works for you that's good).
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