I have a large number of Raster Aerial images which I have been building VRT files for. I'm also building overview for them with the following code
gdaladdo -r average -ro Y:/vrt/sussex_2016_aerial.vrt 2 4 8 16 32 64
The orginal images are GEOTiffs and I would like to create compressed overviews but I'm struggling to understand the code required, which I need to add to the above line. I would be grateful if someone can point me in the right direction?