The gpx2tcx pages have two purposes:
1) To translate a gpx file to a tcx file. There are a lot of sites that do this. I made this for two purposes, the site I was interested in doesn't accept
gpx-files and is very strict about how the tcx file should be constructed and also, gpx files from different sources can use rather different layout. Both these reasons are because the tcx and gpx standards are quite loose leaving to the implementer to decide how to format/interpret the files.
2) I wanted some analysis of the data that I couldn't find elsewhere so it was relatively easy to put that analysis here.
A short description of the gpx2tcx site:
The input is a gpx file that you have to have on your computer, probably downloaded from some internet source or maybe your smartphone.
The output can be a tcx file or a csv file (for excel), you can also get the tcx file zipped if you like. The default though is to just analyse the file to get some statistics and diagrams.≈ß.
The data moved from the gpx to the tcx file are: times/dates, total distance, heartrates, gps coordinates, altitudes, cadence. It also computes some averages and max values.
First a summary of the activity, Number of gps-readings, total distance, total time, average pace and speed, max and average heartrates, average cadence and elevation gained and lost.
Then there is a table of how much time and distance spent in different pace/speed. This statistic is also shown in a diagram.
Then a table with some statistics for each lap (if selected). time per lap, lap pace, lap speed, heartrates, and Aerobic Efficiancy (a relatively new measure).
It is now also possible to enter your resting and max heartrates. This enables the program to calculate hr zones and if you have done that
you'll get a table and a diagram with time spent in five different hr zones for all laps(!).
AE is "Aerobic Efficiency" which is Intensity/Effort which in turn is calculated as Average Speed/Average Heartbeats.
It could be used to see your development by comparing simular tracks. (Higher AE means that you can run faster at the same heartbeat level).
I recently also developed a NAE (Normalised Aerobic Efficiency) statistic. As it is made with respect to your heartrate span it should make
it meaningful to compare with others (for the same track). The formula is: NAE = V/((AHB-RHB)/(MHB-RHB)) where V is the average velocity in km/h for your run,
AHB is the average heartbeat frequency (bpm) in your run and MHB and RHB are Maximum and Resting heartbeat frequency (bpm) respectively.