Strava Ride Segment

I created a ride segment the other day on Strava.  The ride segment is from S. Washington St. in Frenchtown, NJ to Kingwood Stn Rd 3 miles down the towpath from Frenchtown.  What's pretty cool is that Strava will give you all of the metrics for your ride segment.  Does anyone know how that works?  Is it being done real-time?  I'm not even sure my phone was on.  I know Strava wasn't running on my phone.  Does Strava do it all post ride when I download my ride from my Garmin Edge into Strava?  That is, Strava looks at my ride and says, "hey I've got a segment along that ride in my database so lets capture the metrics for that segment for you".  The average Power is a little high but that's because I was wearing my PowerCal HR monitor/power meter instead of my hub based power meter on my road bike.  I'd say it was 5-10% high...closer to 10%.

Anyway, I think it's pretty cool that it gives the metrics for the segment- see chart/graph above.

Power ON!  Coach Rob