Brief
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Zones
Each rose is one elevation band; a wedge is the surface class the model gives most of that band's cells on that aspect (N at top, clockwise), the centre is flat ground. Hover or tap a wedge for the top three classes.
Weak layers
Map
Trip log
Fill this in after a day out; the record below goes into
snow/trips.json in the repo (a list of these), where the daily job scores it against the model.