GeoTIF becomes super large by joining two grid bands (geotiff)

Question

I have two raster tapes (GeoTIFs) that I want to merge into one GeoTIF with two bands. I used this command in the shell: gdal_merge.py -separate -o myoutput.tif *.cropped.tif, which was shown here.
The original GeoTIFs had a size of about 200 MG each, the merged GeoTIF had a size of 6 GB.
Does anyone have an idea what this might be about and what I can do to reduce the size?

Ian Turton · Answer

When creating a new GeoTiff Gdal takes no account of how the input tiff was processed and writes your new file out as raw data.
You need to add some creation options to compress and tile it. See Paul Ramsey's compression for dummies for more details.
gdal_merge.py -co COMPRESS=deflate -co TILED=YES -separate -o myoutput.tif *.cropped.tif

GeoTIF becomes super large by joining two grid bands (geotiff)

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