measuring milleage with online maps
- Thread starter MichaelW2
- Start date
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MossCommuter
Guru
- Location
- Salford
If you have Google Maps then I'll assume you have Internet access and a browser and you can try out:
http://gb.mapometer.com/
On there you can draw a route by clicking on a map - it follows roads by default or you can turn that off for some or all of a route.
When done - you'll get your distance.
It's free to use.
http://gb.mapometer.com/
On there you can draw a route by clicking on a map - it follows roads by default or you can turn that off for some or all of a route.
When done - you'll get your distance.
It's free to use.
MossCommuter
Guru
- Location
- Salford
and you can turn the snapping off for a bit if you're going somewhere it doesn't know
Ajax Bay
Guru
- Location
- East Devon
https://ridewithgps.com/routes/12795371
https://www.cyclechat.net/threads/t...y-100km-a-month-challenge.193553/post-4205459
Some of these routes were plotted after the ride. Others were planned beforehand (and then amended to reflect where I actually cycled).
I also use RidewithGPS to compare two or more options for Point A to Point B which allows me to see difference in distance and height climb/descent.
https://www.cyclechat.net/threads/t...y-100km-a-month-challenge.193553/post-4205459
Some of these routes were plotted after the ride. Others were planned beforehand (and then amended to reflect where I actually cycled).
I also use RidewithGPS to compare two or more options for Point A to Point B which allows me to see difference in distance and height climb/descent.
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youngoldbloke
The older I get, the faster I used to be ...
Bikehike - better maps.
jefmcg
Guru
Just like to shout out to http://www.gmap-pedometer.com which I am pretty sure was the original one.
doog
....
- Location
- The beautiful south
This is an excellent site http://cycle.travel/map
Not just for measuring but also planning routes both here and abroad for those interested. Tried and tested both here and around Europe..trust me bookmark it..
Not just for measuring but also planning routes both here and abroad for those interested. Tried and tested both here and around Europe..trust me bookmark it..
steveindenmark
Legendary Member
Plotaroute is an excellent app
ColinJ
Puzzle game procrastinator!
- Location
- Todmorden - Yorks/Lancs border
I know the question was about online maps, but I still suggest looking at Memory Map which you can run on a desktop PC, and/or a laptop, and/or a phone, and/or a tablet and/or a Memory Map compatible GPS. A single 1:50,000 scale Landranger type OS map (ideal for cycling) covers the UK (except for NI), at a current price of only £80 - HERE.
Ajax Bay
Guru
- Location
- East Devon
@andym How do you know that a cycle computer correctly calibrated with the wheel circumference (to the nearest mm?) will give a more accurate record of the distance than a GPS or a distance calculated from mapping software using, say, OSM? For running races the measuring device is rolled at a walking distance by hand and its calibration has to be checked at set and frequent intervals against a 'known' distance.
Tin Pot
Guru
You can do it in google maps.
Put the start and finish, calculate route, then drag points from the line to where you actually went where different.
Ajax Bay
Guru
- Location
- East Devon
[QUOTE 4217348, member: 9609"]firstly my cycle computer is set by the wheel circumference and I only have an option of exact CMs (211,212,213,214 etc) so if the true circumference was 2135 mm and i use 214 then that is a quarter of a mile out every 100
then quoted tyre circumferences are not that accurate, my current tyres 700 28C have a quoted figure of 2136mm but I have just very carefully measured mine at 2127 (and my computer is set at 214)[/QUOTE]
I have exactly the same issue (cycle computer calibration by wheel circumference but only to the nearest cm). However my 622-28 tyres (Conti GP4Ss) are actually radius 339mm (ie when fitted on a 622-15 rim - the expected half of 622 plus 28). Multiplying by 2pi gives you 2130mm . . . I've (re)set my Cateye Velo2 to 213. This gives odometer results which closely tally with my GPS, over a 100+km ride (which by the way also tallies within 1/2 a per cent of the RidewithGPS route calculation).
Sheldon is worth reading. He says: "However, the actual rolling diameter will be about 1% smaller for a road tire," - I think this is because of the deflection of the tyre under normal load (about 5%? = 1.4mm) reduces the effective circumference by, in my (and your) case ~9mm).
then quoted tyre circumferences are not that accurate, my current tyres 700 28C have a quoted figure of 2136mm but I have just very carefully measured mine at 2127 (and my computer is set at 214)[/QUOTE]
I have exactly the same issue (cycle computer calibration by wheel circumference but only to the nearest cm). However my 622-28 tyres (Conti GP4Ss) are actually radius 339mm (ie when fitted on a 622-15 rim - the expected half of 622 plus 28). Multiplying by 2pi gives you 2130mm . . . I've (re)set my Cateye Velo2 to 213. This gives odometer results which closely tally with my GPS, over a 100+km ride (which by the way also tallies within 1/2 a per cent of the RidewithGPS route calculation).
Sheldon is worth reading. He says: "However, the actual rolling diameter will be about 1% smaller for a road tire," - I think this is because of the deflection of the tyre under normal load (about 5%? = 1.4mm) reduces the effective circumference by, in my (and your) case ~9mm).
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jefmcg
Guru
[QUOTE 4217348, member: 9609"]A number of issues with this, firstly my cycle computer is set by the wheel circumference and I only have an option of exact CMs (211,212,213,214 etc) so if the true circumference was 2135 mm and i use 214 then that is a quarter of a mile out every 100
then quoted tyre circumferences are not that accurate, my current tyres 700 28C have a quoted figure of 2136mm but I have just very carefully measured mine at 2127 (and my computer is set at 214) so I am getting an extra free 0.6 per 100 at the moment
[/QUOTE]
That is still more accurate the GPS. GPS data is just a series of points. The software then applies an algorithm to estimate the distance travelled between those two points. The level of accuracy is lower than your estimate above. I just took the same GPX file and gave it to endomondo and strava. The calculated distance (each site uses a different algorithm, clearly) was 0.7 km over 50km ride, so more than double the error you estimated above.
That's assuming the original GPS was accurate. Garmin only claims an accuracy of 3-5 metres, so there's a lot room for error there.
then quoted tyre circumferences are not that accurate, my current tyres 700 28C have a quoted figure of 2136mm but I have just very carefully measured mine at 2127 (and my computer is set at 214) so I am getting an extra free 0.6 per 100 at the moment
[/QUOTE]That is still more accurate the GPS. GPS data is just a series of points. The software then applies an algorithm to estimate the distance travelled between those two points. The level of accuracy is lower than your estimate above. I just took the same GPX file and gave it to endomondo and strava. The calculated distance (each site uses a different algorithm, clearly) was 0.7 km over 50km ride, so more than double the error you estimated above.
That's assuming the original GPS was accurate. Garmin only claims an accuracy of 3-5 metres, so there's a lot room for error there.
Again, any of these plotting software just estimates the course you will take. Your tyre has travelled the exact course, so will be more accurate than any of the methods suggested here.
