[OSM-talk] OpenPisteMap: Cross Country Ski Trails.

Simon Wood simon at mungewell.org
Mon Mar 2 17:40:06 GMT 2009


> > Yes I know that GPS elevation is not that accurate. 
> Says who ? I do have a ~10m vertical precision and sometimes less when stopped 
> with my Garmin 60cx.
> I find it very enough for many many cases, even more than STRM models

Technically the vertical accuracy is always less than the horizontal.

The receiver (http://www.point-inc.com/products/gsr1700csx.html) I'm using quotes:
Static 			 H: 5.0 mm + 1.0 ppm	 V: 8.0 mm + 2.0 ppm
Kinematic, Stop-and-Go   H: 10.0 mm + 1.0 ppm	 V: 12.0 mm + 2.0 ppm
Stand-Alone Position	 1.8 m CEP Horizontal

I'm using it stand alone, although in theory I could use a UHF link back to a base station in the parking lot.

The resultants tracks are a little bit jumpy in the heavily tree-ed enviroment:
http://www.openstreetmap.org/user/Mungewell/traces/325254
http://www.openstreetmap.org/user/Mungewell/traces/325256
http://www.openstreetmap.org/user/Mungewell/traces/320570

It doesn't help the accuracy when I fall over though.... ;-)

Cheers,
Mungewell.


> 
> 
> > I would like to add a 'ele=xxx' tag to the markers tag at the junction of
> > the trails to give some indication of height gain/loss between markers. 
> 
> I'm doing it as well, puting in somewhere on a way might be problematic has 
> someone might mive the node along the way, but if properly tagged at a 
> mountain_pass, a peak, a crossing, I would find it very usefull.
> 
> 
> -- 
> sly 
> Sylvain Letuffe liste at letuffe.org
> qui suis-je : http://slyserv.dyndns.org
> 
> 
> 
> _______________________________________________
> talk mailing list
> talk at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/talk




More information about the talk mailing list