Answer: Visible satellite imagery.
Explanation: Visible satellite imagery is an imaging technique used to take satellite images or photographs of the earth which can be interpreted in other to provide information about cloud cover at certain location and season.
In visible satellite imagery interpretation, the ground is colored Grey, water is dark-colored and the cloud exhibits white color. Snow-covered ground during winter are also colored white. Due to the similarity in color exhibited by snow and cloud, a looping picture can be employed as clouds will move while snow covered ground wouldn't.
