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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?

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Gdaladdo manual page http://www.gdal.org/gdaladdo.html contains an example that creates small jpeg compressed overviews which suit well for aerial images.

Create an external JPEG-compressed GeoTIFF overview file from a 3-band RGB dataset (if the dataset is a writable GeoTIFF, you also need to add the -ro option to force the generation of external overview):

gdaladdo --config COMPRESS_OVERVIEW JPEG --config PHOTOMETRIC_OVERVIEW YCBCR --config INTERLEAVE_OVERVIEW PIXEL rgb_dataset.ext 2 4 8 16

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