If I understand, you have DEM tiles in one projection (location) and you're trying to use r.proj to transform the tiles into a different location.
If that's the case, typically you would use the r.proj flag '-g' to get the region settings in the target location from the raster extent in it's source location. So you might do something like:
 g.region -p `r.proj -g loc=<source location> map=<source mapset> input=<source dem>`

then run r.proj without the -g flag and you should get the reprojected raster.

Finally, once you have all the tiles reprojected, use
 g.list raster pattern=<....> sep=comma
to get a list of all the tiles, then g.region -p rast=<list of tiles>
to set the computational region to cover all tiles.

One additional point: consider to patch all DEM tiles together in their native projection *first* then project the single patched DEM once to the target projection.

Regards,
Micha 

On 07/06/2018 08:25 PM, Rich Shepard wrote:
  I am trying to add additional DEM maps to the project location. There is
one DEM overlaid on a soil mapping unit map for the county in the attached
screenshot. My reading of the g.region manual page did not let me find the
answers I need.

  The computational region is set to the soil map. Attempting to re-project
the DEM to the immediate west of the existing one fails; grass7.5svn tells
me, "ERROR: Input raster map is outside current region." I don't understand
why this is since the soil map is much larger than the DEMs and I used
'g.region vect=soils' to set the size.

  Another question is how I can expand the region to add a DEM immediately
below the one on the attached map. The eastern edge of the DEM is beyond the
limit of the soil map.

  Learning more about manipulating regions while assembling project maps
will help me now and in the future. Pointers to more resources for me to
read will be very helpful.

Rich




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-- 
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918

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