It may be from 2014 but this article by Amit Kapadia is just as interesting today as it was back then. In it he talks about the process behind removing banding artefacts in Landsat 7 imagery caused by malfunctioning hardware on the satellite. Fascinating!

Debanding the world
In 2003 machinery on Landsat 7 broke. This malfunction now causes stark black diagonals across all images. Despite the malfunction, NASA kept the satellite in operation; it’s still collecting…