[GRASS-user] GRASS GIS virtual raster data sets

[Nikos Alexandris]

Dears,

I guess there is no GRASS GIS built-in implementation of GDAL's VRT
concept (several related ideas listed
https://trac.osgeo.org/grass/wiki/Grass8Planning).

Once past some compilation issues, I am about to try to build a VRT
based on native GRASS GIS raster maps (using GDAL with support for GRASS
GIS raster data), then link to this VRT via `r.external` from inside a
regular Mapset.


As a side-note, an image without pre-computed statistics stored in its
metadata, will require some time for `r.external` to work. The latter
likely forces  this computation.

Perhaps it is faster to use `gdalinfo`'s '-stats' option to do this.

I wonder if there are smart ways to build, in GRASS GIS' data base,
a larger virtual raster map out of many smaller ones, without the need
to actually patch the latter ones in a new raster map file.

Nikos
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