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I think that jo is pulling out the GPX tracks from Strava (which requires a premium account that I don't have, and have no intention of getting)
You don't need a Premium account to get the data from Strava, it's just not in GPX format directly. The data is displayed on the analysis page of any activity (not a Premium feature) so it must be inside the javascript somewhere, so I took a look.
Using Firebug there are 3 queries the javascript performs, all of which return json. One contains a series of lat/lon points, the other two queries do things like time, distance, altitude, heartrate, smoothed speed, etc. There's a bit of duplication between the last two queries, and it may be possible to combine it all into one query.
The two sets of data should have the same number of points and so it's a case of grabbing and combining the two/three datasets and then making each of the points into a GPX trackpoint.
Busy this weekend but I'll see what I can come up with over the next few days.
Greenbank-
I should have added "and which gives a level of data that I'm not sure is actually required" as I think that the day to day comparison is in lots of ways of more interest that the minute to minute one, and that actually, having done the rolling 5 day bits, I think that they are about right for trend work. Start looking too small, and you miss the big picture (and I don't want to duplicate jo's work more than I am doing now)
MrDrem
I think that jo is pulling out the GPX tracks from Strava (which requires a premium account that I don't have, and have no intention of getting), which would allow him to do something like that. His charting is stunning, but I quite understand why he's going to cut down on it.
Steve had also started letting the garmin run on whilst he slept if he had crossed midnight, which I suspect would mess up the elapsed time details and calculations, but I've not looked. I might do if I ever get a few hours with nothing to do.
I'm still quietly quite chuffed with mine, and impressed with what you can do with simply inputting 2 numbers per rider per day.