Diamond Peak was the first to add SNOWsat capability to a couple PistenBulley groomers for the 2014-15 season. It turned out to be very useful to be able to know snow depths during grooming given the low snow levels. For the 2015-16 season, three other U.S. ski resorts used SNOWsat: Heavenly in CA/NV, Timberline in OR, and Jiminy Peak in MA according to a Dec 2015 article. There are at least 100 places in Europe using SNOWsat.
"The SNOWsat helps by measuring snow depth and displaying it on monitors where snowcat operators and resort managers can see it. It's a high tech version of the previous measuring system, which involved ski patrollers working throughout the day to use sticks to measure and record snow data.
It works by using a computerized, three dimensional map of the mountain without snow as a baseline. Then sensors mounted on snowcats allow satellites and a base on the ground to pinpoint the location of each vehicle that's outfitted with the technology.
By measuring how far the snowcat is above bare ground the system can tell operators the snow depth with an accuracy of less than two inches."
Timberline could use SNOWsat in 2015-16 to easily check on the snow depth on the Palmer terrain. This blog article include examples of the mapping provided to groomer operators in real time.