Specify input/output format in Readme

[freenerd]

The readme should specify exactly which input and output formats exist. Is coordTimes a universally accepted property or something we came up with?

[planemad]

@freenerd Readme updated, it seems like coordTimes is something @tmcw came up with since there is no standard to do this in the geojson spec.

[tmcw]

Yep, I would love for this to be slightly more standard but that's a job for mr. @sgillies specification author

[sgillies]

Tell me more about coordTimes. Sounds like a good candidate for a GeoJSON extension. What it would need to be a good extension is its own namespace, eg, properties['gpx-ish']['coordTimes'] instead of properties['coordTimes'], and documentation of the protocol to be followed (zipping the coordTimes and coordinates lists together).

[TheMarex]

If we are going to to standardize this, we should go with timestamps instead of coordTimes.

[planemad]

Since we're expecting users to use this along with togeojson, the change will have to be implemented there first.