Only certain regions receive a red region marker on the map:
- "Riding areas" receive a red marker icon.
- City regions with trails (sub-regions do not receive a red region marker).
When a region is added, the marker will be large until we run a backend script that will calculate the region size. The script runs once a week.
Regions are given a global ranking score using the following formula:
((AVG(t.rating) / 2) + (SUM(t.votes) / 10) + (SUM(t.faved) / 10) + (SUM(t.ridden) / 100) + (SUM(t.total_checkins) / 1000) + (t.views / 1000000))
*The 't' in the formula refers to all the trails within that region
The regions with map markers are ranked per-state (or country) based on the above global ranking popularity scale. If there are more than 10 markers in a state, then those markers are grouped into 3 sizes using that popularity scale (these sizes are applicable to the biking, hiking, & trail running regions):
- Size 1 = top 30%
- Size 2 = middle 40%
- Size 3 = bottom 30%
If a region has fewer than 5 trails, it receives a Size 4 ranking.
Recently, this ranking scale was changed for certain activity types so there are now only 2 sizes for those activity types (excluding biking, hiking, and trail running):
- Large (above 5 trails)
- Small (5 trails)