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Help!: Mapping new rides...what gives with the ascent totals?

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  1.  
    • CommentAuthorFree Memberdsowder
    • CommentTimeApr 18th 2008
     
    dsowder

    I've just discovered that mapmyride.com is replacing routeslip (which worked wonderfully well thank you very much).  The "climb" or "ascent" totals are completely wrong.  Both on maps that were migrated over and maps that I put in new.  The hill profile looks accurate...but the totals are not even close.

     Also, is there a place for general site feedback.  I'm dying to make some comments.

    • CommentAuthorFree Memberdsowder
    • CommentTimeApr 21st 2008
     
    dsowder

    Out of curiousity, I downloaded the raw CSV data.

     Distance from start(miles), elevation, accumulated ascent, accumulated descent
    0, 862.86,0,0
    0.03, 866.61,0,0
    0.07, 866.14,0,0
    0.1, 863.8,0,0
    0.13, 862.86,0,0
    0.17, 863.33,0,0
    0.2, 867.08,0,0
    0.24, 869.89,0,0
    0.27, 869.89,0,0
    0.3, 868.95,0,0
    0.34, 868.95,0,0
    0.37, 870.36,0,0
    0.4, 870.36,0,0
    0.44, 866.61,0,0
    0.47, 868.02,0,0
    0.51, 869.89,0,0
    0.54, 871.77,0,0
    0.57, 874.11,0,0

     

    So the data points are showing the changes in elevation but the accumulated ascent and descent aren't being calculated.  Anybody?????
  3.  
    displacedClimber
    I also noted that when mapping a ride you can see the "ascent" or "climb" rise to say 1,200 ft, then when posting your next point the "ascent" drops to say 900 ft. Hu? I didn't know going down hill reduced my total climb...
    • CommentAuthorFree Membersamuri
    • CommentTimeMay 3rd 2008
     
    samuri
    yep, I've just noticed this too. My lowest point was 100ft, my highest was 1069ft and yet my TOTAL ascent (for a 40 mile ride) was only 870ft. I wish it felt like I'd climbed less than was physically impossible but sadly not.
    • CommentAuthorFree Memberbrummell
    • CommentTimeJul 5th 2008
     
    brummell

    Something crazyn is going on.  Routes that I had that used to have the sensible cumulative ascent, now do not in the new (July) version of MapMyRide.  Please fix!  (Of course, I *love* this tool, so thanks for all the other work you guys do!)

    Nic

     

    • CommentAuthorFree Memberpsyfalcon
    • CommentTimeJul 6th 2008
     
    psyfalcon

    It almost looks like feet and meters got mixed up.

    Switching to meters gives a total ~3 times higher than it gives in feet.  Actually, thats almost certainly what happened. The height in "m" (ie minimum and maximum elevation) is right what you would read off the topo in FEET.

    • CommentAuthorFree MemberRevJester
    • CommentTimeJul 9th 2008
     
    RevJester
    Yeah, I've seen this problem as well.  I want my cumulatives back!  Also my auto-notes!
    • CommentAuthorFree Membercakewalk
    • CommentTimeJul 17th 2008
     
    cakewalk

     

    Indeed.  A route I imported from bikely.com (via file) showed 1700 m ascent  - figure from bikely is 2700m.  I downloaded the csv file and worked out the total ascent from the elevation figures - came to 2300m.   

    Something very strange going on.    

    • CommentAuthorHero!!kevin@mmf
    • CommentTimeJul 18th 2008
     
    kevin@mmf

    Auto-notes are enabled by a checkbox in the Map Settings. 

    As for questions about elevation accuracy and the data sources we use:

    We report ascent and descent stats for routes when they become 'significant'. This is currently set at about 60 meters of total climb. We can't guarantee a great deal of accuracy for routes with ascents < 60m, so we don't want to confuse our users by displaying inaccurate data. For long ascents, you should see your stats appear the the right of the elevation profile.

    Our ascent and descent calculation algorithms don't count every small elevation change at every point because we need to filter out 'noise' in the underlying data. Prior to our latest algorithm change, we were reporting ascents that were in many cases too high. Our new algorithm gives more reasonable results for a wider variety of routes. However, since we know that this isn't 'perfect' quite yet, we've provided the raw data in CSV format so that users such as yourself can interpret the data as you choose.

    Cheers, - Kevin

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