Given LocationHistory.json exported from Google Location History, calculates total distance traveled and estimates how much was walked.

distanceCalculator.js

results = require('./LocationHistory.json')
  .locations
  .map(function (location) {
    return {
      time: location.timestampMs,
      lat: location.latitudeE7 / 10000000,
      long: location.longitudeE7 / 10000000,
    }
  })
  .reduce(function (results, curr, index, array) {
    if (index === array.length - 1) { return results };

    deltaDistance = getDistance(curr.lat,
                                curr.long,
                                array[index+1].lat,
                                array[index+1].long);
    deltaTime = (curr.time - array[index+1].time)/1000;
    speed = deltaDistance / deltaTime;

    // 1.3 m/s (average walking speed)
    if (speed > 1.3) {
      results.vehicleDistance += deltaDistance;
    } else {
      results.walkingDistance += deltaDistance;
    }
    results.totalDistance += deltaDistance;

    return results;
  }, {
    totalDistance : 0,
    walkingDistance : 0,
    vehicleDistance : 0,
  });

// Distance between lat long points in m
// From http://stackoverflow.com/a/21623206
function getDistance(lat1, lon1, lat2, lon2) {
  var p = 0.017453292519943295;    // Math.PI / 180
  var c = Math.cos;
  var a = 0.5 - c((lat2 - lat1) * p)/2 +
          c(lat1 * p) * c(lat2 * p) *
          (1 - c((lon2 - lon1) * p))/2;

  // 2 * R; R = 6371 km
  return 12742 * Math.asin(Math.sqrt(a)) * 1000;
}

console.log(`Total distance travelled: ${ results.totalDistance/1000 } km`);
console.log(`Distance travelled by vehicle: ${results.vehicleDistance/1000} km`);
console.log(`Distance walked: ${results.walkingDistance/1000} km`);