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adjusted outlier analysis such that fixes that are far apart time-wise will not have their measured SOG/COG used for outlier analysis

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Axel Uhl committed 2013-07-11 12:20:38 +02:00
1 parent a112e35f90
commit 4fae9a0c1c
1 file changed
+13 -12
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java/com.sap.sailing.domain/src/com/sap/sailing/domain/tracking/impl/DynamicGPSFixMovingTrackImpl.java
+13 -12
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@@ -95,11 +95,12 @@ public class DynamicGPSFixMovingTrackImpl<ItemType> extends DynamicTrackImpl<Ite
}
/**
* In addition to the base class implementation, we additionally have the speed and bearing as
* measured by the device. We use the device-measured speed and compare it with the speed computed
* based on the timestamp and distance between previous and next fix. If the latter speed exceeds the
* measured speed by more than a factor of {@link #MAX_SPEED_FACTOR_COMPARED_TO_MEASURED_SPEED_FOR_FILTERING},
* the fix is considered invalid.
* In addition to the base class implementation, we additionally have the speed and bearing as measured by the
* device. If the adjacent fixes are within the averaging interval defined by
* {@link GPSFixTrackImpl#getMillisecondsOverWhichToAverageSpeed()}, we use the device-measured speed and compare it
* with the speed computed based on the timestamp and distance between previous and next fix. If the latter speed
* exceeds the measured speed by more than a factor of
* {@link #MAX_SPEED_FACTOR_COMPARED_TO_MEASURED_SPEED_FOR_FILTERING}, the fix is considered invalid.
*/
@Override
protected boolean isValid(NavigableSet<GPSFixMoving> rawFixes, GPSFixMoving e) {
@@ -111,22 +112,22 @@ public class DynamicGPSFixMovingTrackImpl<ItemType> extends DynamicTrackImpl<Ite
boolean fixHasValidSogAndCog = (e.getSpeed().getMetersPerSecond() != 0.0 && e.getSpeed().getBearing().getDegrees() != 0.0);
GPSFixMoving previous = rawFixes.lower(e);
GPSFixMoving next = rawFixes.higher(e);
Speed speedToPrevious = Speed.NULL;
if (previous != null) {
Speed speedToPrevious = null;
if (previous != null && Math.abs(previous.getTimePoint().asMillis() - e.getTimePoint().asMillis()) <= getMillisecondsOverWhichToAverageSpeed()) {
speedToPrevious = previous.getPosition().getDistance(e.getPosition())
.inTime(e.getTimePoint().asMillis() - previous.getTimePoint().asMillis());
}
Speed speedToNext = Speed.NULL;
if (next != null) {
Speed speedToNext = null;
if (next != null && Math.abs(next.getTimePoint().asMillis() - e.getTimePoint().asMillis()) <= getMillisecondsOverWhichToAverageSpeed()) {
speedToNext = e.getPosition().getDistance(next.getPosition())
.inTime(next.getTimePoint().asMillis() - e.getTimePoint().asMillis());
}
result = (!fixHasValidSogAndCog || ((previous == null || speedToPrevious.getMetersPerSecond() <= MAX_SPEED_FACTOR_COMPARED_TO_MEASURED_SPEED_FOR_FILTERING
result = (!fixHasValidSogAndCog || ((speedToPrevious == null || speedToPrevious.getMetersPerSecond() <= MAX_SPEED_FACTOR_COMPARED_TO_MEASURED_SPEED_FOR_FILTERING
* e.getSpeed().getMetersPerSecond())
&& (next == null || speedToNext.getMetersPerSecond() <= MAX_SPEED_FACTOR_COMPARED_TO_MEASURED_SPEED_FOR_FILTERING
&& (speedToNext == null || speedToNext.getMetersPerSecond() <= MAX_SPEED_FACTOR_COMPARED_TO_MEASURED_SPEED_FOR_FILTERING
* e.getSpeed().getMetersPerSecond())))
&& (maxSpeedForSmoothing == null
|| (previous == null || speedToPrevious.compareTo(maxSpeedForSmoothing) <= 0) || (next == null || speedToNext
|| (speedToNext == null || speedToPrevious.compareTo(maxSpeedForSmoothing) <= 0) || (next == null || speedToNext
.compareTo(maxSpeedForSmoothing) <= 0));
e.cacheValidity(result);
}