[DVBC] re: elevation

[dvwc at comcast.net]

Most of the website mapping tools have a disclaimer about their elevation measurements. 

I think it was at MapMyRide.com that I read why theirs doesn't "work" per se.... basically if a climb segment is short enough, it gets skipped over. So, if the up comes all at once, it'll be measured, but then if the down happens in short enough chunks, it won't show up. So a loop could have more (or less) climbing than descending. Which is exactly how some of my rides feel!

Another example is to just stand still with a gps in your hand; you can see your elevation fluctuate all over the place. Bikely can't do much better than gps since that's where their original data came from.

Jon


dvbc-list at dvbc.org wrote:
>One comment I would have on Bikely elevation profiles. The few times  
>I have checked the route prediction with the GPS data from someone  
>that rode the ride the Bikely estimate seems to consistently be  
>significantly below actual. It certainly gives you a accurate  
>indication of where the climbs are just don't count on the total  
>elevation gain to be accurate.
>
>
>On Apr 10, 2008, at 2:45 PM, domzdvbc at att.net wrote:
>
>> Hey, Jenny, you could try to map the course on Bikely.com.  Once  
>> you lay out the course you can generate an elevation chart and find  
>> the hills, and maybe the distance to and between each of them.   
>> Hybrid images might also help familiarize you with the course.
>>
>> Good luck with your event!
>>
>> Dom
>>
>> -------------- Original message from "Jenny Ashbrook"  
>> <jennifer.ashbrook at comcast.net>: --------------
>>
>> The race is June 1.  Here's the website, if anyone is interested:  
>> http://www.cgievents.com/cgiracing/bbt/index.html, I'm doing the  
>> half-iron distance.  I'm hoping to ride the course 3 or 4 times  
>> before the race.  I'd like to know exactly where the nastiest hills  
>> are...  Most of my training is during the day when the kids are at  
>> school - so my road trips are likely to happen mostly when just  
>> about everyone else in the world is at work, unfortunately.  It  
>> would be nice to have some company!
>>
>> Jenny
>> -----Original Message-----
>> From: dvbc-list-bounces at list.dvbc.org [mailto:dvbc-list- 
>> bounces at list.dvbc.org]On Behalf Of sfischer10 at comcast.net
>> Sent: Thursday, April 10, 2008 6:00 AM
>> To: dvbc-list at dvbc.org
>> Subject: Re: [DVBC] Road trip, anyone?
>>
>> Can't do this Fri due to work but interested if you do again.  When  
>> is this race?
>>
>> -------------- Original message --------------
>> From: "Jenny Ashbrook" <jennifer.ashbrook at comcast.net>
>>
>> > I'm training for a triathlon that starts at Beltzville State  
>> Park, in Lehighton,
>> > PA, in a couple of months, and I'd like to get to know the bike  
>> cours. If the
>> > weather looks good, I'm planning on taking a road trip up there  
>> this Friday to
>> > ride one loop of the bike course (about 27 miles). Anybody want  
>> to come along?
>> > It looks to be about a 1:15, 1:30 hour drive up there. I'll  
>> probably leave from
>> > Wallingford at around 8:45, and I'll probably be biking at a (B-) 
>> ish pace.
>> >
>> >
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www.velospace.org/node/7016

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