[openstreetmap/openstreetmap-website] Traces KML upload (Issue #6873)

[Minh Nguyễn]

1ec5 left a comment (openstreetmap/openstreetmap-website#6873)

The example Traccar output above is only useful for visualization, akin to GeoJSON. A KML `<Placemark>` contains a vector [geometry](https://developers.google.com/kml/documentation/kmlreference#geometry). Traccar’s output uses a `<LineString>` element that contains the individual trackpoints in a `<coordinates>` tag. These coordinates lack individual timestamps, apparently relying on the consumer to display the entire trace at once or interpolate the points. As noted in https://github.com/openstreetmap/openstreetmap-website/pull/6876#pullrequestreview-3929002753, we require a timestamp per coordinate in order to animate the trace accurately and also store the points individually.

Google’s KML profile has an alternative geometry type, [`<gx:Track>`](https://developers.google.com/kml/documentation/kmlreference#gxtrack), that annotates each coordinate in the track with a timestamp. This would be useful for our purposes. Do you know if there are any popular software packages that produce KML with tracks in them?

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