The age of Satellite data commenced not long after the space race commenced in the 1950’s and 1960’s, where Nations rushed to populate space with devices capable of monitoring each other.
This eventually came into the Climate Science realm where many countries placed satellites into low and high earth orbits to monitor the various layers of the atmosphere.
Controversy over this data
UAH – University Alabama Huntsville produces a satellite based temperature graph that can be controversial, but is regarded by many as a very constant indicator that temperatures are not accelerating as many government and media organisations state.
Dr Roy Spencers model: