This week I’ve started running/jogging, and I’m using RunKeeper on my iPhone to track my progress.
RunKeeper stores all the GPS data from your runs. This data is displayed per run, including a nice map of your route. Most important data can be reached throught the web interface, things like pace (min/km or min/mile) and distance. The most rewarding thing in running is breaking your own records, and RunKeeper has a couple of records:
- Longest run (distance)
- Longest run (time)
- Most calories burned in a run
- Fastest average pace
As you can see, all those statistics are about single runs, what I’m missing are the following records:
Fastest 1 KM, 3 KM, 5K, 10K etc.
For example, when I’ve run a very fast 5.5 km run, I’d love to see this reflected as my 5K personal record, but right now it is lost because I’ve already done a slow 6 km run and a very fast 1 km sprint.
But luckily RunKeeper has a very useful option for us developers: Settings > Export data.
This results in a ZIP file with GPX files, raw GPS data with time and location!
The first thing I did was download the XSD and generate the JAXB Java code:
Now I can open the GPX files in Java and extract the GPS locations and time like this:
The next thing I did was translate the lat+long+time waypoints into ‘legs’ consisting of meters+seconds.
Those legs can be used to check for a record during longer runs, like this:
For example using a target of 5000 meters in a 5070 meter run, this analysis finds the following 5K times:
The information from RunKeeper website is:
- Distance: 5.07 km
- Time: 30:38
- Pace: 6:03
But when analysing the data more accurately, it could have said:
- New personal record 3K: 00:16:46
- New personal record 5K: 00:29:55
I couldn’t believe this feature wasn’t available in RunKeeper… but after a lot of Googling it turns out a lot of other people are looking for this ‘most requested’ feature! With a little bit of Java (100 lines of code) you can get a pretty good result: