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I’ve written previously about Ordnance Survey’s Terrain 50 data and how you can merge it together. You can download the dataset from the OS’s opendata repo.
I’d like to update that post with merging in R. Once you’ve extracted your zipped zips, you can run the following to merge to a single geotiff file:
f = list.files("~/Downloads/temp", pattern=".asc", full.names=T)
mosaic_rasters(f, paste0(normalizePath("~"), "/GIS/OS/Terrain50.tif"))
As previously, this is using gdal, but now via R instead of through the QGIS gui.