FLCC> [Fwd: Today's 46 mi ride - MapMyRide.com]

[Ruth Sherman]

I did find out some info on how MapMyRide calculates total climb (see 
below). Probably not a mapping software to use for this region as there 
are lots of rollers that will not be included in the calculation.



ELEVATION ASCENT / DESCENT SEEM TO BE WRONG!
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.


Andrejs Ozolins wrote:
> I can add another climbing number to those: DeLorme's Topo software says 
> you climbed 2,763 feet.  It's interesting that your GPS is closer to 
> that number than the MapMyRide because GPS units are not particularly 
> good at measuring vertical movement. But, behind the disagreement is the 
> fact that your measurement of climbing depends on how you define 
> climbing. If you count every single inch of vertical movement as a 
> climb, then you'll come up with astronomical figures for a whole ride. 
> In practice, the rules can be be defined to give a range of results -- 
> at what minimum rise to start measuring; what increments to measure, 
> etc. Anyway, my impression is that the Topo figure of 2,700 is probably 
> closest -- over the years, seeing elevation figures from watches and 
> bike computers as well as other people's reports, the DeLorme estimate 
> has always been pretty much  in the ballpark.
> 
> Andrejs
> 
> Ruth E. Sherman wrote:
>> Also, there is a big discrepancy between my GPS and MapMyRide's estimate
>> of our total ascent - the GPS said we climbed 2321' whereas MapMyRide 
>> says
>> we climbed 1363'. I prefer to believe the former.
>>
>> ---------------------------- Original Message 
>> ----------------------------
>> Subject: FLCC> Today's 46 mi ride -  MapMyRide.com
>> From:    "Ruth E. Sherman" <res6 at cornell.edu>
>> Date:    Sun, April 6, 2008 10:42 pm
>> To:      flcc at icycle.org
>> -------------------------------------------------------------------------- 
>>
>>
>> After much trial and error and a lot of googling, I was able to download
>> today's route from my GPS into a mapping program (most of these mapping
>> programs are not well supported for us Mac users). You can access the
>> route at the site below:
>>
>>     Ruth Sherman thinks that you should check out the workout he/she just
>> plotted online:
>>    http://www.mapmyride.com/ride/united-states/ny/ithaca/639350988
>>
>>         You can also search for other cycling routes in Ithaca, New York:
>>    http://www.mapmyride.com/find-ride/united-states/ny/ithaca
>>
>>  
>