The ground is public lidar (USGS 3DEP 1/3 arc-second (10 m) seamless DEM); the runs are reproduced from OpenStreetMap, not the resort's own map.
Grades are sampled from the lidar ground along each mapped run.
Compare Hilltop Ski Area with 2 other resorts nearby: runs, lifts and the steepest terrain side by side.
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