Another Strava question

[mcelliott]

Just come back from a ride and there seems to be an issue with my elevation. When I uploaded from my garmin device it showed 2,112 metres which I know to be fairly accurate as I'm familiar with my training route. However, when I clicked to view the ride in more detail it showed my elevation to be just short of 1,600 metres, inso wiping off 500 metres. Is there any way I can get this back? I'm assuming there's some sort of glitch with the gps.

[Jimbo.]

Garmins - and any other units - are generally ste at estimating altitude. Stand-alone GPS can be way, way out (IIRC something like 2,3 or maybe even 10x the horizontal error), and local conditions, blocked "holes" etc can play havoc with barometric stuff.

Best bet is to plot it out on an OS map and then work it out manually (scouts styleee, counting contours!)

[mcelliott]

I was wondering if the weather may have affected the readings - we've had appalling weather here today, rain of biblical proportions and scudding low cloud. In fact, in an earlier ride this morning, my 705 device completely refused to read any elevation whatsoever which is why I chopped that for the garmin forerunner for my second ride.

[JEA1K]

I've seen this before ... a mates Garmin 800 and my 510 gave 1,500m differential in elevation during the same ride. Unfortunately no way to recover.

[fadeaway]

can't comment on these particular errors, but in general GPS is very ropey for elevation.

It's very accurate for a horizontal position, but the way it works means that elevation isn't very precise. Ie the satelites are all above you, and a vertical difference between them isn't very much, so you get a big margin of error.

[Mr Will]

Strava has a "Correct Elevation" function hidden inside the ? next to the elevation figure. Click it and you might get a more accurate result.

[S10GTA]

Mr Will said:

Strava has a "Correct Elevation" function hidden inside the ? next to the elevation figure. Click it and you might get a more accurate result.

This. I went back and did every ride I have even been on since mid 2010. Took forever!

[duff]

Mr Will said:

Strava has a "Correct Elevation" function hidden inside the ? next to the elevation figure. Click it and you might get a more accurate result.

Cool, thanks for that - I knew my elevation data was too high, this looks like it has sorted it!

[Kell]

Is that only on the paid-for version?

I can't seem to find anything like that on mine.

[S10GTA]

Kell said:

Is that only on the paid-for version?

I can't seem to find anything like that on mine.

Nope, its on the free one. Look at your ride overall. Next to the mileage is the elevation, and under that it states elevation. If it's odd, there will be (?) next to it. Click it and it will update.

[itsnotarace]

JEA1K said:

I've seen this before ... a mates Garmin 800 and my 510 gave 1,500m differential in elevation during the same ride. Unfortunately no way to recover.

Not true! You can use http://strava-tools.raceshape.com/snap/ - the elevation difference will likely be where your Garmin went "off course" a little bit and sometimes it fails to recognise the climb a bit. My weekend ride just gone missed off two Category 4 climbs when uploaded to Strava and instead of registering 4300ft of climb, Strava only saw 2900ft. This will sort it out by "snapping" the GPS trace back to the actual road when signal has been blocked by trees or whatever

HTH

[ChrisMCoupe]

Just used this Race Shape tool on my ride yesterday, as a part under a lot of over hanging trees went off course, but only by a tiny amount for around 2km. However, I only asked Race Shape to correct this small section, but the resulting tcx file has just knocked 2.5km off my ride distance? Any idea how or why it would do this? The rest of the Garmin output looked spot on.

[Jonnny]

Kell said:

Is that only on the paid-for version?

I can't seem to find anything like that on mine.

I also couldn't find it on mine.

When I got back, saved the ride it said 4,000ft+ elevation.. Went onto the ride and it's now at 2,500ft

[S10GTA]

I'll show you a screenshot later when I upload my ride to work.

[S10GTA]

Here we go.

Once you have uploaded a ride and see the overview of it you might see this if there is an issue (?) the rest is straight forward.

[S10GTA]

anonymous said:

[redacted]

Felt like riding in treacle yesterday.

[47p2]

S10GTA said:

Here we go.

I wasn't far behind although my ride had a bit more elevation.

So why is my calorie count a lot lower than the above?

[S10GTA]

47p2 said:

S10GTA said:

Here we go.

I wasn't far behind although my ride had a bit more elevation.

So why is my calorie count a lot lower than the above?

probably because I'm fatter than you

[y2blade]

I do the same 10 mile route every night...8 out of 10 times it records the elevation as the same.
The other 2 times it can be all over the place.

[RobGT81]

Have people using Garmins setup elevation points using known altitudes? I think this can help the barometer with your elevation.