This video shows the Beaver Creek snowcats grooming the mountain at night under a full moon. The video was created by the compilation of the 2,460 images. 12 hours plays back in 49 seconds. The data from any part of an image that is different from the previous image was added to the previous image and saved as the next frame in the movie (stacking). This results in a video that incrementally shows the terrain they have groomed. The Snowcats cover a lot of territory in 12 hours getting the mountain ready for the next day's skiers.