Hi guys, i've a little problem here.
I'm working with gps data, getting values every second and displaying
current position on a map.
The problem is that sometimes (specially when im using the app on
indoor and not make a move) the values vary a lot, making the current
position to change.
I was wondering about some easy enough method to avoid this.
As a first idea, I thought about discarding values with accuracy
beyond certain threshold, and use Exponential filtering as i use on my
Bearing. But i get up on Antartica. Here's the code that i used to get
the location and filtering it with exponential :
public void onLocationChanged(Location newLocation) {
// Get previous Location, needed to get
the Bearing Value
if(currentPosition != null)
{
prevLocation = currentPosition;
pLat = (int)
(prevLocation.getLatitude() *1E6);
pLongi = (int)
(prevLocation.getLongitude()*1E6);
}
currentPosition = new Location (newLocation);
int lat = (int)
(currentPosition.getLatitude()*1E6);
int longi = (int)
(currentPosition.getLongitude()*1E6);
//Smoothing Latitude,Longitude
if(lat != 0 && longi != 0){
coor[0] = lat;
coor[1] = longi;
if (smoothingCoor == null){
smoothingCoor = coor;
}
for (i=0; i<coor.length;i++){
smoothingCoor[i] =
smoothingCoor [i] +alpha * (coor[i] -
smoothingCoor[i]);
}
smoothLat = (int)
(smoothingCoor [0] * 1E6);
smoothLongi = (int)
(smoothingCoor [1] * 1E6);
currentPosition.setLatitude(smoothLat);
currentPosition.setLongitude(smoothLongi);
}
// Get Bearing Value
if(prevLocation != null && currentPosition !=
null){
bearing =
prevLocation.bearingTo(currentPosition);
//Smoothing bearing value with exponential
if (smoothingBearing == 0) {
smoothingBearing = bearing;
} else {
smoothingBearing = smoothingBearing +alpha *
(bearing -
smoothingBearing);
}
}
Hope you can understand my explanataion, and i provide enough
information
Thanks
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