Hi, You need to set the computational region to the extent of the 4 tiles first:
g.region raster=map1,map2,map3,map4 -p Then you can use r.patch. See 'Notes' section here: https://grass.osgeo.org/grass74/manuals/r.patch.html HTH, Vero El mié., 10 oct. 2018 8:09, Mehrdad Varedi <[email protected]> escribió: > Hi Everyone, > I have four DEM files to merge. their format is Tiff and I can merge them > easily in QGIS and create a virtual Raster file. I can't import that > virtual layer into GRASS and I don't know how can I do the same on GRASS > GIS. If I could merge them to one big raster file in any possible way, that > would be great. > > None of the following has worked for me. (Maybe I am using them > incorrectly in some cases or probably that's my machine) > > *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. > I have tried *r.patch *which doesn't generate any error, although the > created result is empty with no errors. > > *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. > > 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. > > I don't want a fix for all of the above, I just wanted to share with you > what I have done so far. Would you please help to merge the 4 Tiff files > into one? > > Thanks for your help, > > Mehrdad > > -- > Mehrdad Varedi > ᐧ > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user
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