Take the 2-minute tour ×  I'm assisting a retired user in
combining a large number of raster tiles downloaded from
Historic Digimap
http://edina.ac.uk/digimap/description/historic_overview.shtml
into one project in qgis.  I'd like if possible to combine these
into one layer, - I'm aware that these can likely be stitched
together using an external tool, but am unsure exactly how to go
about doing so (or whether this is in fact possible in qgis
itself) in a way that the resulting layer is still usable on a
standard desktop pc (~4GB ram) or whether this is in fact not
possible.  Many thanks in advance  share|improve this question
4 Answers 4  This should be an ideal case for GDAL buildvrt:
http://www.gdal.org/gdalbuildvrt.html  Only thing that is
necessary is georeferencing information. Geotiff would be best.
For putting Dutch maps into a vrt, I used the following commands
on Windows:  for %%N in (D:\Karten\gdal\gdal2tiles\NL50\*.tif)
DO gdal_translate -of vrt -expand rgba %%N
D:\Karten\gdal\gdal2tiles\NL50\%%