Iam trying to calculate speed ( using distance/time). I know there getSpeed method on Location, but I tried it while driving and GPS on and it was not accurate at all My calculations were closer to reality.
Anyways, my question is , is there any way I can get speed using network location within a certain error range? Right now , it is throwing values like 100 km/hr and 5 km/hr for every location I get in the network and I am not if there is reliable way. I currently just make sure that whatever location I get from network is newer than the previous network location
Thank you
Since you already have a list of locations, my suggestion is that, filter your location data received from network.
Speed is one of the factor you can use to filter.
You may try other ways to filter, like points in the wrong direction or far away from your path.
Increase the frequency of your location collection.
"accuracy" value from the network location data. But be careful with this. Big value doesn't always mean bad location, and small value doesn't always mean good location. After filtered, you may calculate your speed again.
Related
When we save coordinates gps in android , We know the gps is not precise
for example , Here the blue point is the real coordinates, the red points is the gps gets in several attempts
this is (not a real ) route, after we drawn the lines if you have (driven/walking/moved)
this is (other fake ) route which is much more fine,
is there some algorithm/code for get this result ?
As you said - you will get different readings even if the GPS is static, due to GPS errors, but that's not the whole story: When you move relatively slow, you're also getting those erros. There are few things you can do about it:
Filter out "bad" readings - when you get a location from the GPS, you also get the location's accuracy. Decide a threshold, say 20m and ignore any readings with worse accuracy.
Filter out close readings - If the distance between the current location and the previous location is smaller than some threshold (I'd suggest 10 - 20m) - ignore the current location and wait for the next one.
You can also use your device's sensors (like the accelerometer) to decide if your device is moving or not. You can see a code example here.
I am tracking rider's location(bike rider) and calculating total distance travelled per session by him. I have used fused location api only (no GPS). There are times when I am getting jumps in location and due to these jumps extra distance is added,hence results in overall wrong distance. Please help me in finding these wrong latitude and longitudes. Is there any good filter which can be easily implemented in Android or any good method for the same?
Distance measurement on raw GPS data will always be noisy, because the underlying data is often inaccurate. These jumps are due to inaccurate location measurements. To achieve, accurate distance measurements, you can need to filter the noise in the data.
Some useful filtering techniques that you can explore are:
Smoothening location data using Kalman filters - see tutorial
Snapping to road with Google maps snap-to-roads API, or OSRM match service.
If you are looking for an end-to-end solution that gives accurate location data and distance measurements, you can also try the HyperTrack SDK for Android or iOS. You can read about how they filter locations to improve accuracy on their blog. (Disclaimer: I work at HyperTrack.)
Location isn't exact. Even with GPS it isn't. Fused location can be off by hundreds of meters. If you're standing still every few minutes you'll get one reading that's just really off. Sometimes I walk from my kitchen to the bathroom and it thinks I've gone a quarter mile. If you look at the accuracy it returns, remember that there's a 2/3 chance you're within that distance. There's still a 33% chance that you're nowhere within that radius.
You're going to have to accept inaccuracy. There are a few ideas you can do though
1)Ignore all updates unless they travel at least some minimum distance. Adding in all those little amounts will add a lot of inaccuracy quickly.
2)Require at least 2 updates near a new location before accepting that as the new location.
But if you're using network location for short movements- you're going to have a difficult time of it.
Go to Settings -> Location -> Mode.
And make sure the mode is set to Device only.
This will stops the jump
I am in need to develop an android app where the device will track the distance traveled while the user is in a moving vehicle. I am getting the GPS values at small interval so that I can retrieve the distance and sum them up. But the problem I am facing is, while the user is in the vehicle, the device is not getting a clear view of the sky. Hence, the GPS device cannot get values as frequently as I desire. Thus, the result produced contains huge fluctuations. I tried using the network provider, but that is even worse in this scenario.
It would be very much helpful if anyone can suggest me a solution to this problem.
Just put the receiver onto the inner side of the windshield, like all navigation systems do. This should give an acuracy of about 3-6m. (when SBAS correction is available in your location) or up to 10m if not.
If the receiver is not state of the art (combined GPS + GLONASS or BEIDOU) then you will have problem in cities, especially in urban canyons with location jumps up to 30m.
This is normal. To get correct result for a GPS application within a city you need advanced algorithms. Just summing up the distance between two consecutive locations is to primitive, this never works well. Distance calculation by GPS has be answered some times her at SO. Use the search engine, to get more info at that topic.
Of course, set the device to GPS provider only, with maximum precision.
I am self learning Android programming at the moment. I was about to write app that will display my location on map without using GPS.
I have tried using NETWORK_PROVIDER and found that my accuracy is constantly at 2000 even in city area with a lot of wifi around the area.
I would like to know how could other map application (e.g. GoogleMap) is able to achieve high accuracy without using GPS.
They use GPS. Or they lie about their accuracy. Ever seen the big blue circle around your position in Google Maps? That means they think you're somewhere in that circle, and are guessing about actual position.
The only way to get accuracy is to use GPS/GLONASS signals. A-GPS can help to fix position quickly because it provides info about which satellites are in view from your phone cell position (your device don't spend time trying to get signals from satellites not in view).
The 'High accuracy' mode is just a lie from Google to know your position all the time to monetize you in perverse ways
If you are using the network provider to fetch the location they are not very accurate. SO its not a good idea to fetch the accuracy of your position using
network provider. Its best to use GPS to get the location updates. You can use GetAccuracy() method of Location class and see for the value it returns.
Let Say if getAccuracy() retruns 25 then you can leave this value wait for another gps value which is more accurate.
Right now, I only know of one method to do this:
- Get last known location
- Have the location manager request location updates
However, I really only need to get the CURRENT coordinates ONCE right when the application is called, but it's not doing what I want.
What's the simplest way to get the current coordinates? Is there something I could call or some code I could use just to get the location RIGHT NOW ?
thanks in advance! I'm still a little new with android development.
What's the simplest way to get the current coordinates?
There is no way to get the current coordinates on demand.
Is there something I could call or some code I could use just to get the location RIGHT NOW ?
No, for three related reasons:
Not all location technologies are low power. GPS, for example, is a serious battery hog. Hence, GPS is not powered on unless something is actively seeking a GPS fix.
Not all location technologies are instantaneous. GPS, for example, takes some number of seconds to get a fix after being powered on.
No location technology is universally available. GPS, for example, may be unavailable because you are in a large building.