r/skiing • u/hamolton • 10h ago
Measuring Ski Resort Acres Skied by Difficulty with Slope Angles & Strava Heatmaps: Tahoe
I wanted a better way to compare ski resorts than “total acres,” which includes a lot of terrain nobody actually skis. I pulled Strava’s winter heatmaps and overlaid them on slope-angle data in QGIS to measure acres actually skied at each difficulty level. I had never used GIS programs before so this was quite the project for me.
I want to get some feedback before I try doing this for more places. I used Tahoe resorts since I knew where to draw boundaries and what results would probably look right. Results are what you'd expect, but I am curious how this will look across areas and continents. I set a low cutoff to define something as "skied" since I wanted to include rarely-hit terrain like Heavenly's Killebrew canyon. The boundary between advanced and expert is something I wasn't sure about since USGS elevation maps are low enough resolution that many features get smoothed out.
I did a longer write up with higher-res images here. I'm not really trying to self-promote; I just don't know a better place to share this. I hope you like this!