Virtual Partner goes back in time

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• Paul Toigo   Friday 16 Sep 2022 19:48:28

  I have many instances where my Virtual Partner in my TCX is going back in time. I'd like to insert images (and attach files) to demonstrat this problem, but can't. Here's a simple route that exhibits the issue.
  https://www.plotaroute.com/map/2034642
  Virtual Partner settings --
  Flat Speed 22.00 km/hr
  Uphill: 1m up = 14.15m flat
  Downhill: 1m down = -13.42m flat
  Steep downhill: 1m down = -4.75m flat

• plotaroute admin   Saturday 17 Sep 2022 12:08:46

  Thanks for reporting this Paul. At what point in the route do you see this happening?

• Mark Worthington   Saturday 17 Sep 2022 12:57:58

  To insert an image, just copy/paste, like this screenshot .... 
  
  

• Mark Worthington   Saturday 17 Sep 2022 13:23:22

  Starte a new thread ... How do I Insert an Image or even a File

• Paul Toigo   Wednesday 21 Sep 2022 17:22:00

  @plotaroute admin It happens at the following points in the route. I'm thinking the model can create a negative time interval on some downhill sections. I'll think about it more later.

  [IMAGE REMOVED DUE TO SIZE]

• plotaroute admin   Thursday 22 Sep 2022 09:13:00

  I think you're right Paul - the time adjustments for downhill sections are probably creating this anomaly.  I think this would be very tricky to resolve. Reducing your Downhill adjustment from -13.42 would probably help.

• Paul Toigo   Friday 23 Sep 2022 15:45:37

  I retract my notion that "the model can create a negative time interval on some downhill sections." If my math is right, with a flat speed of 22 km/hr, a downhill grade would have to exceed 21.6% to model a negative time with my steep downhill setting of "Every 1m down equivalent to -4.75m". I altered the setting to the fastest allowed of -10.00m which requires a downhill grade to exceed 45.45% to model a negative time interval. This had no impact on the number, 22, of negative time intervals.

  All this said, perhaps it is time to create a more realistic model for cycling. A "simplified" Chung (Virtual Elevation) Method would be darling. I'm willing to consult on the algorithm.

• plotaroute admin   Monday 26 Sep 2022 09:12:48

  Thanks for that analysis and your offer of help Paul. We've got a vast number of things already on our feature requests list and while we'd love to promise to do them all, realistcally this isn't something we'd be able to find time to look for the foreseeable future I'm afraid. 

• Paul Toigo   Monday 26 Sep 2022 11:38:14

  OK, set aside the virtual elevation method. There's still the matter of something wrong causing the model to back in time and I suspect the code, not my configuration.

• plotaroute admin   Tuesday 27 Sep 2022 09:14:03

  Sure Paul, we'll certainly add it to the list to look into.  It's quite an obscure one though, so I have a feeling it will be hard to track down and fix.