Such observations are able to see change over time and help with interpretation of satellite cloud data. (observer.globe.gov)
I've worked satellite cloud cover analyses — long ago. (judithcurry.com)
Using their recently developed methods for removing spurious artefacts from historic satellite cloud records, Joel Norris et al. have constructed a record of the global pattern of cloud changes between the 1980s and the 2000s. (nature.com)