Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Long Distance Competition/Ultracycling, Randonneuring and Endurance Cycling Do you enjoy centuries, double centuries, brevets, randonnees, and 24-hour time trials? Share ride reports, and exchange training, equipment, and nutrition information specific to long distance cycling. This isn't for tours, this is for endurance events cycling

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-04-10, 12:51 PM   #1
m_yates
Senior Member
Thread Starter
 
m_yates's Avatar
 
Join Date: Feb 2008
Location: Rochester, NY
Bikes:
Posts: 610
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Best way to find elevation profile?

I just completed my last century of the season, and I want to determine the total elevation gain and loss. The route is on mampmyride.com, but the elevation seems wrong. I exported the route to a GPX file, then added elevation data using gpsvisualizer.com. The numbers come out way different.

Here is what I get for total ascent:

mampmyride.com: 3583 ft

bikeroutetoaster.com (using GPX file with NED elevation data): 4218 ft

bikeroutetoaster.com (using GPX file with SRTM1 elevation data): 4675 ft

bikeroutetoaster.com (using GPX file with SRTM3 elevation data): 4641 ft

utrack.crempa.net (using GPX file with NED elevation data): 6969 ft

utrack.crempa.net (using GPX file with SRTM1 elevation data): 9200 ft

utrack.crempa.net (using GPX file with SRTM1 elevation data): 8011 ft


As you can see, the numbers are all over the place. My legs felt like 9200 ft was the correct one, but I'm wondering what is the most accurate way to get the true elevation gain/loss for a route?
m_yates is offline   Reply With Quote
Old 10-04-10, 01:55 PM   #2
Bacciagalupe
Professional Fuss-Budget
 
Bacciagalupe's Avatar
 
Join Date: Aug 2005
Bikes:
Posts: 6,438
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
AFAIK there is no one accurate method. Different services / software use different methods to calculate elevation.

The best thing you can do is select one method and stick with it for as long as possible.
Bacciagalupe is offline   Reply With Quote
Old 10-04-10, 03:04 PM   #3
m_yates
Senior Member
Thread Starter
 
m_yates's Avatar
 
Join Date: Feb 2008
Location: Rochester, NY
Bikes:
Posts: 610
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
OK, I guess the method I'm sticking with is ridewithgps.com

I uploaded my GPX file and ridewithgps.com has a feature to correct the elevation gain using their data. The ridewithgps.com site corrected my elevation gain to 6503 ft. Their value is intermediate between the others, so 6503 ft is my story and I'm sticking to it.
m_yates is offline   Reply With Quote
Old 10-05-10, 08:28 PM   #4
cccorlew
Erect member since 1953
 
cccorlew's Avatar
 
Join Date: Dec 2006
Location: Antioch, CA (SF Bay Area)
Bikes: Roubaix Expert, Motobecane Ti Century Elite turned commuter, Cannondale F500 Mtn bike, Some old French thing gone fixie
Posts: 6,772
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
This is easy! Whatever the highest number is clearly the correct number.
When my group does doubles, whoever gets the highest on their GPS is the "official" entry.
cccorlew is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 03:52 AM.