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Ask HN: How can Google Fit tell if I am cycling?

4 points by hakann ↗ HN
It did miss a couple cycling sessions but it is mostly accurate. Does it combine the data from GPS and the accelerometer? Are these always on?

3 comments

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glimcat
It's easyish to derive to good accuracy from the accelerometer signal alone (which I believe is always available).
fprotthetarball
I'm having the opposite problem. I don't use a bicycle, but Google Fit thinks I do. I assume it's confusing my driving with biking, somehow.
radq
I did a project along these times some time back, training a Hidden Markov Model on accelerometer + gyroscope data sampled every 100ms gave basically 100% classification accuracy. Can share the code with you if you are interested.