Ключевые слова: abstract background, outdoor activities, outdoor recreation, skiers, skiing area, skiing conditions, skiing environment, skiing marks, skiing paths, skiing slopes, skiing traces, skiing tracks, skiing trail, skiing trails, snowcovered landscape, snowcovered terrain, snowy backdrop, snowy field, snowy ground, snowy scenery, snowy surface, sunny day, sunny weather, traces, white snow, winter landscape, winter scenery, winter season, winter sport, winter sports,