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waymarkedtrails / waymarked-trails-site

Main repository for issue tracking and discussions for waymarkedetrails
http://waymarkedtrails.org
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GPX EXport #414

Closed tvage closed 2 years ago

tvage commented 2 years ago

The GPX export for Isle of Isle of Wight Coastal Path contains an unexpected trkseg at the end, which is a duplicate of one elsewhere in the file and is some 10 miles away from the previous point. . After importing into Garmin BaseCamp, the track shows:

4242 86 ft 292.0° true N50.69305° W1.10811°
4243 63 ft 295.1° true N50.69313° W1.10845°
4244 47 ft 299.1° true N50.69321° W1.10870°
4245 10.9 mi 225.8° true N50.69327° W1.10888°
4246 34 ft 190.8° true N50.58336° W1.28687°

There is nothing obviously wrong in the OSM data at either end of the unwanted line, no breaks, or spurs in the route.

isle-of-wight-coastal-path.zip

lonvia commented 2 years ago

This is also visible in the elevation profile: https://hiking.waymarkedtrails.org/#route?id=1129666&type=relation&map=12.0/50.6743/-1.3236

lonvia commented 2 years ago

Turns out to be a standard issue of unordered relations. Given that the route contains a forward/backward section around here, the route is not linear anymore and therefore waymarkedtrails can't sort it and uses the order of the members of the relations. The handling will improve once we do proper handling of forward and backward but the gist of it is: for anything that needs an order route (elevation profile, GPX export), a sorted relation will get you the best results.