Hi,
There is a section with the title "Maintaining a current best estimate"
in the following link, it contains an implementation of a method called
" isBetterLocation".
http://developer.android.com/guide/topics/location/obtaining-user-location.html
Hope this helps
/Yaron
--
Yaron Reinharts
Smart Drive Applications
http://www.poncho.co.il/gateaway.php
https://market.android.com/details?id=com.poncho.gsm.gate.activities
On 03/13/2012 05:32 AM, Jinja wrote:
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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