Support Barometric Altimeters from mobile devices

Please, can you add a "button"  that permit to enable/disable elevation correction?

I'm using a Samsung S4 device, with Barometric sensor, and the elevation captured during the ride is perfect (same as barometric Garmin), but when I upload the tracks in the siste, the elevation correction modify and increase elevation gain of 20/30%.

I hate your elevation correction!

Please let me the way to disable it.

thanks

Giorgio

121

Comments

61 comments
  • Official comment

    This topic has come up in our Strava Labs space: http://labs.strava.com/elevation-mashup/#478914533

    We have no projects planned at this time, but we are definitely discussing future potential. Thanks for continuing to post your support and comments. 

    Comment actions Permalink
  • A simple put on / turn off button hould be great

    0
    Comment actions Permalink
  • +1

    1
    Comment actions Permalink
  • I have a Galaxy Nexus, and the altitude calculated by the barometer is very accurate, infinitely better than the Strava correction. This option is the fastest solution: Edit activity > enable/disable elevation correction. So we can compare

    Strava uses the heat map for the route correction. I think that the best solution is to include elevation data collected by devices with barometer in the heat map, and use it

    0
    Comment actions Permalink
  • Hoping the new iPhone 6 will be able to use the barometric data. So tired of having 2-300 ft cut off my stats compared to friends who rode the same route with me.

    0
    Comment actions Permalink
  • Great idea. It furthermore simplifies the merging of some Garmin recorded files and having the "true" elevation afterwards (rather than auto-corrected gpx).

    0
    Comment actions Permalink
  • Sorry but barometric altitude isn't always true. Weather changes affects altitude very much (in a 2 or more hours ride) . So anyone who want to compare climbs has to refer to a standard like the DTM of the area (like the one Strava uses) or else the only device i read (don't own one) have both altitude methods (continuously compared ) is the new Suunto. This is the most accurate method but you cannot compare to anyone else.....  (Speaking as a surveyor engineer and not only a cyclist) 

    0
    Comment actions Permalink
  • In general, you are right, of course. However, my personal experience is that values measured barometric are much closer to the "truth" than the automatically edit elevation data by strava based on gps recording. Especially in the mountains!

    0
    Comment actions Permalink
  • In general, Manos M. is wrong.

    1. Strava doesn't need true altitude.  For a calculation of climbing only the change in altitude is needed, e.g. climb from 1000m to 2000m or from 1200m to 2200m the climb is the same = 1000m. I'll grant that sometimes the rider will get too much or too little credit over a long ride but the difference is nothing compared to the consistent error of DTM.

    2. Strava's DTM correction is terrible, every day inflating ascent on a ride by 30% or more.  I scraped data from Strava and made charts that show the overall advantage of a smartphone over a barometric corrected GPS.  But Strava doesn't seem to care.  I guess the business model is that there are many more smartphones than GPS's.

    The correction is such an advantage that some who want to win climbing contests will select "correct" for perfectly good (e.g.EDGE 800) GPS tracks.   The really astute will ride back and forth loops over areas where the DTM is wrong or out-dated by construction to boost their statistics by 100%. I asked Strava to disable correction or at least show that correction was selected (to shame the user).

     

    0
    Comment actions Permalink
  • Agree with request 110%. Also please allow riders to snap their gps drift to the roads prior to final upload... In otherwords you should have an pre-upload check ride section allowing editing (i.e., strava SNAP tool).....  

    0
    Comment actions Permalink
  • My previus comment was in general. As for Strava now, i don't know the model (the algorithm) strava uses and you are (all of you) right because Strava's altitudes are at least 30% increased.Now more specific barometric pressure changes not only with the altitude but also with the weather (in fact the weather is the one that changes with the altitude). In generaly speaking weather don't change during (lets say in 20 minutes) that is the time of about 400-500m climb so you will have more accurate results with barometric altitude (in elevation differences and not absolute true height) but for bigger durations weather changes is a variable in the equation that you can not predict . Now using DTM the results is more comparable to each other as long as your GPS signal is strong and stays in the road. But be carefull because we are talking for postproccesing DTM and not gps altitude values measured by bike device or phone. Again i will say that i don't know the method Strava is using for postproccesing. In conclusion i will say three things :

    a) For the most accurate meassurements only new Suunto is combining continuasly methods that you can trust. (Thats the truth and not a comercial)

    b) Don't compare altitudes with anyone else except yourself using always the same device and program. You will never find the same results.

    c) Finaly of course i agree "Strava to disable correction or at least show that correction is selected" and anyone decide what to do.

    Thanks for the time and sorry for my english.

    0
    Comment actions Permalink
  • Not only for Android devices, now for iPhone 6, too.

    0
    Comment actions Permalink
  • Garmin Oregon 450 with custom GPX file upload, same problem.

    1
    Comment actions Permalink
  • +1

    0
    Comment actions Permalink
  • +1

    0
    Comment actions Permalink
  • +1

    0
    Comment actions Permalink
  • +1

    0
    Comment actions Permalink
  • For every device which provides barometric data, Strava should disable elevation correction (as it is done for some Garmin devices).

    0
    Comment actions Permalink
  • Dario Zürcher - "For every device which provides barometric data, Strava should disable elevation correction (as it is done for some Garmin devices)"   Strava automatically does elevation correction or enables correction via the Elevation (?) button. Elevation correction is never disabled.

    Manos M - "(Speaking as a surveyor engineer and not only a cyclist) "

    I'm sure you measure altitude with great precision.  Unfortunately the DTM's errors are orders of magnitude worse.  Add in the lateral error of GPS and the errors are compounded.  Then there's the problem of man-made changes to the terrain.  The DTM models the terrain so the DTM does not show bridges across canyons and rivers.  A cyclist can cross a 500' deep canyon and get credit (via correction) for a 500' climb.  DTM's can be out of date - I was looking at elevation profiles on a route and saw that all iPhone users climbed a 400' hill but none of the Garmin users did. Street view showed the road was flat. 

    About barometers - I have see the weather put a bias to altitude change.  So one ride can be a little high or low on ascent.  But over time the bias works both ways; you won't find someone's yearly stats boosted by 50% as you do with so-called correction.  You may not compare your stats to anyone else but some people do (http://app.strava.com/clubs/millionfoot) and I'm sure we'll see claims for a million meters in a year.  The question is - who hit the EASY button?  Strava is hiding the answer from the curious. 

    0
    Comment actions Permalink
  • +1

    0
    Comment actions Permalink
  • I would rather have a button with the ability to correct but where it shows you what it will correct to, i.e display a value.

    Maybe you could have a button next to it to 'vote' that the correction Strava wants is way off. That way you could create a 'heat map' of areas where everyone points out that the Strava data is off and can be investigated or corrected by taking averages of everyone's  barometric reading. Then again this could be automated and a daily job could run to compare six months of barometric data vs Strava data and either automatically amend it or to raise it a job for tech support to investigate - has to be the 'cheapest' option for Strava as it saves employing more helpdesk

    0
    Comment actions Permalink
  • +1

    0
    Comment actions Permalink
  • Come on Strava, let the app use the barometers... by the way all new Samsungs and iPhones have the barometer!!!

    0
    Comment actions Permalink
  • +1 for option to use barometer data when available

    0
    Comment actions Permalink
  • +1

    0
    Comment actions Permalink
  • +1. This site explains best. http://regex.info/blog/2015-05-09/2568

    0
    Comment actions Permalink
  • +1 Explanation with pictures, the evil of correction.  http://tinyurl.com/k29zneo

     

    0
    Comment actions Permalink
  • +1

    I'm struggling to understand why Strava is resisting making this change, given the requests from many, many users over a considerable period of time.

    1
    Comment actions Permalink
  • Yes! Strava needs the barometric altimeter support for iPhone 6/6+ abd relevant android phones!
    0
    Comment actions Permalink
  • Or as internal sensors. Setup. 

    0
    Comment actions Permalink

Please sign in to leave a comment.

Didn't find what you were looking for?

New post