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June 3, 2019 12:50
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True location to noisy location
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| func addNoise(to trueLocation: CLLocation) -> CLLocation { | |
| let distanceWiggle = sampleNormalDist(withMean: 0, std: 0.952) | |
| let xContribution = rng.nextUniform() | |
| let xoff = distanceWiggle * Double(xContribution) | |
| let yoff = distanceWiggle * sqrt(1 - pow(Double(xContribution), 2)) | |
| let newCoord = trueLocation.coordinate.offsetBy(xMeters: xoff, yMeters: yoff) | |
| let newHacc = sampleNormalDist(withMean: 7.179, std: 1.682) | |
| let newVacc = sampleNormalDist(withMean: 3.643, std: 0.300) | |
| let timeWiggle = sampleNormalDist(withMean: 1.00, std: 0.131) | |
| let newTime = trueLocation.timestamp.addingTimeInterval(timeWiggle) | |
| return CLLocation(coordinate: newCoord, | |
| altitude: trueLocation.altitude, | |
| horizontalAccuracy: max(0, newHacc), | |
| verticalAccuracy: max(0, newVacc), | |
| course: trueLocation.course, | |
| speed: trueLocation.speed, | |
| timestamp: newTime) | |
| } |
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