Hopefully someone can help with the below:
I have mapped a ride on Strava and am trying to upload this as a ‘trace’ onto OSM so I can embed the map on my website.
The upload fails because ‘Found no good GPX points in the input data. At least 75% of the trackpoints lacked a tag.’
What does this mean and how can I fix the problem?
A GPX track is a sequence of single “dots” (trackpoints), each trackpoint carrying information on its location and an optional timestamp specifying the point in time when it was recorded. The timestamp can be used to calculate the speed at which the recorder was moving while recording the track. Though these timestamps are optional, OSMs GPX upload only accepts tracks that have them. The tool you used to record the track or extract the data from Strava apparently did not use timestamps, so your upload failed.
You either could try to extract the track again in a format that has the timestamps, or use a tool that adds “fake” timestamps to your track. Unfortunately I don’t know any tools to do this, but I guess other forum users could help out, or there might be some listed on the OSM wiki.
http://www.gpsbabel.org/index.html can be used to add fake timestamps or you could just use a text editor to add them. Do a google search for ‘gpx format’ to work out what text you need to add.
[edit: check my next post for more useful info]