Hello, I've never dealt with GPS data before, but having a quick look at
your code it looks like you have a mismatch in converting your data to and
from integers and doubles.
I notice you multiply by 1E6 when extracting the lat/long, presumably this
is to maintain some accuracy during the double to int conversion...
int lat = (int) (currentPosition.getLatitude()*1E6);
So one fix is to use all doubles and remove all of your *1E6. The other fix
is to use /1E6 instead of *1E6 when converting back to doubles...
currentPosition.setLatitude(smoothingCoor [0] / 1E6);
instead of...
smoothLat = (int) (smoothingCoor [0] * 1E6);
currentPosition.setLatitude(smoothLat);
I hope that fixes your issue.
On Sunday, March 11, 2012 12:46:24 AM UTC-8, concave wrote:
>
> 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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