I am hoping to find a relatively straightforward way to create a virtual raster for a large set of rasters (c. 15,000 TIF files from the TQ 100K Square of OS 1-10K).
I cannot do this in QGIS. I get the following error: "The process failed to start. Either the invoked program is missing, or you may have insufficient permissions to invoke the program". Presumably this is because there are too many files: it works fine for other squares with fewer files.
I have attempted copying and pasting the script that QGIS generates into OSGeo4W Shell, and running it there without success. I have run this at the root of the drive (H:>), the destination folder for the virtual raster, and the folder containing the source tifs. Clearly I am doing something wrong, but I do not have the expertise to know what, or how to remedy it.
The script I get is: gdalbuildvrt "//..../My Documents/GIS/Datasets/Ordnance Survey/1-10,000/2018/Virtual Rasters/1-10K_TQ.vrt" "...list of files..."
Is it possible to do this through OSGeo4W Shell, or do I just need to break it down into smaller chunks and run it through QGIS?
I have tried numerous pieces of advice on here and elsewhere, e.g. https://astuntech.atlassian.net/wiki/spaces/ISHAREHELP/pages/14844053/Mosaic+thousands+of+raster+images, but they are either not specific enough to my situation, or require a level of understanding of script which I do not have.