A groomer will usually go out to pack the snow and improve skiing and snowboarding and snowmobile trail conditions. The resulting pattern on the snow is known as corduroy in ski and snowboard slang, and is widely regarded as a good - albeit unexciting - surface on which to ski or ride.
Snow groomers can also move snow made by snow machines, and are mostly sent out during the night time after the close of the ski-area.
Snow grooming and the associated snow packing is known to have negative effects. The compaction reduces porosity, permeability and water holding capacity of the mountain slopes, while heat flow rates and length of snow retention are seen to increase. This combines to produce longer and deeper frost, causing negative effects on the underlying tussock. It is suggested that the compacted areas be marked and shifted over time to reduce the ecological effects. penetration into the soil.
This one's in use during the Japan 1972 Winter Olympics
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