Weird elevation profile on RWGPS

[livpoksoc]

Hi guys,

I've been trying to edit a ride which I found on rwpgs which is near me, but I tried to adjust the start & end points so they are near to me and/or where I can park the car.

When I edited it though, the route wasn't perfectly overlaid on the roads & I noticed the elevation profile was weird at either end of the route - i.e. a very sharp incline/decline. I can only assume this is because either the original route I'm editing is incorrect, or rwgps, because I know there is no climb of that kind at either of these points.

A screenshot is attached for ref.

 

[livpoksoc]

Not to worry, I got it fixed. I think the file was probably from someone using a mobile app or simple drawing tool as opposed to direct from RWGPS in the first place. When I reviewed it and added my own control points and rerouted the route through those, it drew a more accurate route & the elevation profile adjust accordingly. Wherever the original file came from, the elevation began at the wrong height.

 

[Deleted member 23692]

I wouldn't worry too much as the digital terrain model that RWGPS (and others ) use is anything but accurate.

 

[Banjo]

I get a huge jump in elevation at the start of my rides sometimes. I think its the GPS calibrating itself on start up.

 

[Nigelnaturist]

I wouldn't worry too much as the digital terrain model that RWGPS (and others ) use is anything but accurate.

RWGPS corrected after ride is very close to the elevation provided by my Edge 705.

 

[Deleted member 23692]

Maybe you were lucky

Take this route for example.....

As plotted on RWGPS : +629 / -627 ft
Checked against OS DTM : +823 ft / -822 ft

Track from GPS loaded into RWGPS after being ridden : +750ft / -871 ft
Above track checked against OS DTM : +818 ft / -818 ft

Ridden track re-evaluated in RWGPS ; +737 / -736 ft
Above track checked against OS DTM : +818 ft / -818 ft

The GPS gave a different reading, but as they tend to give poor results on the Z axis, I'll discount that straight away.

Barometric altitude readings are more accurate/consistant, assuming there are no dramatic shifts in baseline air pressure whilst out on the ride, but strictly speaking they are not GPS calculated readings