Donner Ski Ranch — Snow Preservation
Matched OpenSkiMap ski area: Donner Ski Ranch (1 mapped runs, 10 m of vertical drop analyzed).
Score version: ASPECT_V3_FIXED_COORDS · calculated Sep 27, 2026 · source: OpenSkiMap/OpenStreetMap
| Donner Ski Ranch | |
|---|---|
| Snow Preservation Score (0=poor, 100=excellent) |
9 |
| Solar Exposure Score | 91 |
| Overall Confidence | LOW |
| Aspect advantage ratio (actual ÷ neutral-baseline irradiance) |
1.141 |
| Mean fall-line bearing | 213.2° |
| Orientation alignment (0=scattered, 1=fully consistent) |
0.90 |
| Mean slope (mapped, weighted) | 7.0° |
| Ski-season irradiance actual vs. neutral baseline (kWh/m²/day) |
5.00 vs. 4.38 |
Terrain orientation (vertical-drop-weighted)
Each spoke is a compass direction; length is the share of mapped, snow-holding terrain facing that way. A tall, narrow rose means the mountain consistently faces one direction; a round, even rose means it's scattered across every aspect.