Mapping: how accurate?

[Fnaar]

Hi, sorry to post something related to cycling (), but just wondering how accurate mapping sites are in terms of ascent and all that palaver? Reason I arks is cos mapmyride gives 1450 ft ascent on a 67 mile route I wanna try out, and another site has pretty much the same route mapped already with 3900 ft... shome dishcrepanshy.... !

 

[Cycling Naturalist]

Hi, sorry to post something related to cycling (), but just wondering how accurate mapping sites are in terms of ascent and all that palaver? Reason I arks is cos mapmyride gives 1450 ft ascent on a 67 mile route I wanna try out, and another site has pretty much the same route mapped already with 3900 ft... shome dishcrepanshy.... !

If they are designed for southerners, they will exagerate the distance and the ascent, so that three laps of Richmond Park can be claimed to be the equivalent of a mountain stage of the TdF.

 

[Maz]

If they are designed for southerners, they will exagerate the distance and the ascent, so that three laps of Richmond Park can be claimed to be the equivalent of a mountain stage of the TdF.

but only if you ride over the speed bumps and cobbled paths.

 

[Crackle]

They all vary widely. I found Mapmyride to be nearer than Bikely and another (name forgotten) I tried. I checked Mapmyride spot heights agains a map and it seemed roughly right. On rolling roads with short up and downs it will underestimate though, it's better on longer climbs. I have no idea how accurate any of them are compared to reality though.

Edit: Here's my post previously http://www.cyclechat.co.uk/forums/showthread.php?t=5711

 

[Cycling Naturalist]

but only if you ride over the speed bumps and cobbled paths.

Incompatible with a claimed average speed of 45.6 mph.

 

[pzycoman]

Incompatible with a claimed average speed of 45.6 mph.

Your missing a 1 - its 145.6 mph

 

[Dave5N]

Hi, sorry to post something related to cycling (), but just wondering how accurate mapping sites are in terms of ascent and all that palaver? Reason I arks is cos mapmyride gives 1450 ft ascent on a 67 mile route I wanna try out, and another site has pretty much the same route mapped already with 3900 ft... shome dishcrepanshy.... !

Was that total above sea level or perhaps total up and down?

 

[Fnaar]

Was that total above sea level or perhaps total up and down?

It was total ascent....