Computation of elevation gain / loss overestimated in route planning
Hi,
I have lately noticed that elevation gain and loss computed on Locus route planning are overestimated compared to googlemaps or Komoot computation.
On the GPX attached a 362km in the alps, Google is computing around 6500m of gain , Komoot 7300m and Locus 9036m !
Note that I have applied "Update elevation function" (because I created the route with the web app, it was computing around12000m of elevation..)
To me the difference is significant and impact your decision when your plan such a trip.
Even on small RECORDED trip, e.g. 60km not so hilly, Locus indicates around 600m of vertical gain (again based on the recorded trip with 'update elevation' applied) against 560m as predicted by Komoot and recorded roughly by my garmin computer.
Do you have an explanation?
Does it depend on the Map and associated DEM data?
Best regards,
Benjamin
PS: congrats for the good work by the way I love the app alot.
The same question
Which elevation data is used for the (offline) route planner calculations?
I hope the elevation files in the locus folder. IF so, @Benjamin could download and use the more accurate DTM elevation files by Sonny. If you use BRouter, then you're already using them, see BRouter website.
Nevertheless, all elevation calculation are only as accurate as the data. And if the all the small ups and down aren't in the data, then the calculations will be off. Depending on the smoothness of the actual terrain , the smoothing of the elevation data and the route calculations, the total sum elevation is either too high or too low. I guess, I'd prefer if it rather overestimates the sum total elevation ‒ cause there are always ups and downs (esp. on my trails) and the resolution of the elevation data simply isn't high enough to detect those.
Which elevation data is used for the (offline) route planner calculations?
I hope the elevation files in the locus folder. IF so, @Benjamin could download and use the more accurate DTM elevation files by Sonny. If you use BRouter, then you're already using them, see BRouter website.
Nevertheless, all elevation calculation are only as accurate as the data. And if the all the small ups and down aren't in the data, then the calculations will be off. Depending on the smoothness of the actual terrain , the smoothing of the elevation data and the route calculations, the total sum elevation is either too high or too low. I guess, I'd prefer if it rather overestimates the sum total elevation ‒ cause there are always ups and downs (esp. on my trails) and the resolution of the elevation data simply isn't high enough to detect those.
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