I wish to produce a large image. As a base use cloud free regions of multiple Landsat images. I wish to keep the bands and be able to work with the generated mosaic just like a "normal" Landsat image. What ways would you propose to archive a satisfying result? I am on Linux/Qgis
You can also build a virtual raster file (vrt) with GDAL
Add all tif in folder to vrt
gdalbuildvrt C:/tifs/my_vrt C:/tifs/*.tif
Build a pyramid for increased performance
gdaladdo -r AVERAGE --config BIGTIFF_OVERVIEW=YES -ro --config COMPRESS_OVERVIEW DEFLATE --config PREDICTOR_OVERVIEW 2 --config ZLEVEL 9 C:/tifs/my_vrt.vrt 2 4 8 16 32 64
You can use the GDAL VRT builder from QGIS menu Raster > Miscellaneous > Build Virtual Raster Catalog ... You can also make pyramids from the same Miscellaneous menu.