I have approx 500 geo-referenced images that I was hoping to merge into 1 geo-referenced file, and export it as a single geotiff file. To be used in AutoCAD Civil 3D
I know I am pushing my luck and that QGIS moves. I get an error if I tried to merge all the files in 1 go. Same happens if I try building a virtual raster catelogue.
I have tried merging the files in 5 groups, by either building a virtual raster catelogue or merging the files. Then merging the 5 groups into 1 file.
However the above solutions all result in a blank image from exported (Layer -> Save As)
I have read building a pyramid may help using the .vrt file.