Strava lies

[Nigelnaturist]

Thanks, RWGPS says 584m, so I guess it's somewhere in the middle of it all.

I have found gpsies to be more accurate to the ride I have done, but as all my data is with rwgps I use that for consistency of ride to ride comparisons

 

[AndyPeace]

Looking at my last few rides Strava gives identical elevation data to what it reads on my garmin. Is this elevation inaccuracy only when you just use gps to calculate it. I have an 800, so it has a barometer. The only times it's inaccurate are due to weather changes.

 

[Nigelnaturist]

Looking at my last few rides Strava gives identical elevation data to what it reads on my garmin. Is this elevation inaccuracy only when you just use gps to calculate it. I have an 800, so it has a barometer. The only times it's inaccurate are due to weather changes.

Try correcting the elevation on strava, and then you will see, most of the elevation of mine on strava is from the unit, unless I have combined rides.
Try this, go ride some where, go inside somewhere warmer for a couple of hours, and I bet the elevation you went in is different to that when you restart, as it is connected to the temp gauge, from what I read

 

[BSRU]

You could always use Garmin it allows you to select elevation correction which uses information from professional surveys to correct altitude information.

 

[AndyPeace]

Try correcting the elevation on strava, and then you will see, most of the elevation of mine on strava is from the unit, unless I have combined rides.
Try this, go ride some where, go inside somewhere warmer for a couple of hours, and I bet the elevation you went in is different to that when you restart, as it is connected to the temp gauge, from what I read

I think I understand now, it's when you use Strava to calculate the data rather than your units data.
Just looking at this ride , as uploaded no corrected data...and RidewithGps has docked me 100ft
http://app.strava.com/activities/78228848
http://connect.garmin.com/activity/367124433
http://ridewithgps.com/trips/1715614

All the same ride, so I assume rwgps automaticly uses their elevation calculation not the data from the Barometer.

 

[Nigelnaturist]

You could always use Garmin it allows you to select elevation correction which uses information from professional surveys to correct altitude information.

Thats even worse than rwgps.
The ride I have just done was 34.31 miles with according to unit a 500edge gain 1142ft loss 1165 so a difference of 23ft which isn't bad, start and finish at the same place. Corrected with garmin 1562 gain and 1560 loss.
RWGPS 1552 gain 1550 loss so pretty close this time,
gpsies 1220 gain and 1217 loss, I think this is about right, but it's to troublesome to use
if I corrected with strava I would lose about 30%

 

[Nigelnaturist]

I think I understand now, it's when you use Strava to calculate the data rather than your units data.
Just looking at this ride , as uploaded no corrected data...and RidewithGps has docked me 100ft
http://app.strava.com/activities/78228848
http://connect.garmin.com/activity/367124433
http://ridewithgps.com/trips/1715614

All the same ride, so I assume rwgps automaticly uses their elevation calculation not the data from the Barometer.

No like garmin you still have to correct it, till then it should use the units data, like strava should, but if its an app on a phone, strava can do what they want.

 

[AndyPeace]

Try correcting the elevation on strava, and then you will see, most of the elevation of mine on strava is from the unit, unless I have combined rides.
Try this, go ride some where, go inside somewhere warmer for a couple of hours, and I bet the elevation you went in is different to that when you restart, as it is connected to the temp gauge, from what I read

I tried that and got some interesting results
If I correct my elevation data
Strava claims this: http://app.strava.com/activities/78291190 (268ft)
Garmin connect claims this http://connect.garmin.com/activity/367124379 (492ft)
Ridewith gps didn't have a correct elevation feature and says 366ft
Edit: rwgps does have elevation correction and it now reads 469ft
My 800 says it was 370ft
I guess it's all inaccurate so I'll stick with the barometer numbers, unless they get corrupted by time/weather changes.

I know what you mean about time between rides, happens a lot when I record my commute as one ride, as a barometer relies on air pressure changes to calculate elevation.

 

[Nigelnaturist]

@AndyPeace
The thing to do is chose one and stick with that, at least that way, or at least mine, it shows the difference from one ride to another, so if compare a ride with another, in terms of ft/mile its consistent because the data that rwgps uses is the same over the roads I ride, so if my spreadsheet says 42ft/mile for a ride and the next 50ft/mile i know that ride was more difficult, but using what ever elevation data you use in combination with the climbbybike formula you can work out how difficult a ride was (gpsies actual does this), because it also includes distance, and so you can know see how complex my sheet is, but most is just number crunching
This afternoons ride on gpsies correct elevation.
http://www.gpsies.com/map.do?fileId=brzcdyqfzucezdgo

 

[JoeyB]

Strava clearly lies...'apparently' I haven't KOM'd anything!

 

[BSRU]

Thats even worse than rwgps.
The ride I have just done was 34.31 miles with according to unit a 500edge gain 1142ft loss 1165 so a difference of 23ft which isn't bad, start and finish at the same place. Corrected with garmin 1562 gain and 1560 loss.
RWGPS 1552 gain 1550 loss so pretty close this time,
gpsies 1220 gain and 1217 loss, I think this is about right, but it's to troublesome to use
if I corrected with strava I would lose about 30%

All this time I have been using RWGPS and I did not know it had elevation correction .
I tried elevation correction on a few RWGPS and it seems to better than Garmin as the height gained and lost are the same or virtually the same.

 

[Nigelnaturist]

All this time I have been using RWGPS and I did not know it had elevation correction .
I tried elevation correction on a few RWGPS and it seems to better than Garmin as the height gained and lost are the same or virtually the same.

They are on Garmin, just it higher for your gain and loss as a rule. Though I think even rwgps is high. The main thing is to use a consistent system which gives the same results from ride to ride, so comparisons can be made.

 

[Rob3rt]

You could just give up worrying about it altogether.

 

[Nigelnaturist]

You could just give up worrying about it altogether.

Ditto, as what ever system you use it's different.
Just log your mileage and time, its all you need, me I am just a stats freek

 

[HLaB]

This is the most all three sites have been in aggrement for me but pause for just a second and strava always under reports speed. I don't fid it too much different on elevation but the calories are always miles different on all three
http://app.strava.com/activities/78529855
http://connect.garmin.com/activity/367242681
http://ridewithgps.com/trips/1716582