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Posted to issues@cordova.apache.org by "Remi Boardman (JIRA)" <ji...@apache.org> on 2017/11/23 16:29:00 UTC
[jira] [Updated] (CB-13604) Returned location coordinates are very
inaccurate after requesting location for a period of time while not
connected to wifi
[ https://issues.apache.org/jira/browse/CB-13604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Remi Boardman updated CB-13604:
-------------------------------
Description:
While requesting a location every 10 seconds using an interval, I consistently see the accuracy of returned positions suddenly jump to several kilometers. The lat/long of each location request in my App is saved to an external database and is then used to update the marker position on a web based Google Map. At first the marker is in exactly the right place then after several minutes it becomes wildly inaccurate.
To debug this I saved the accuracy of each location request to an array and each time I tested, the accuracy began at around 10-65 metres then jumped to around 2km on Android and over 10km on iOS after around 6-7 minutes consistently. The returned coordinates continue to be very inaccurate for several minutes and then return to between 10-65 metres.
Here is a subset of the location accuracy array on iOS when the issue is present:
{quote}
[
65,
65,
65,
65,
10079,
10079,
10079,
10079
]
{quote}
As far as I can tell, this issue is only present when the device is not connected to a wifi network. I can reproduce this behaviour on both iOS and Android, while inside and stationary, and while travelling on foot with line of sight to the sky. I have ensured the app remains in the foreground while testing and the device/screen is awake. I make no changes to the App or device when the accuracy decreases.
I have tried with and without {{enableHighAccuracy}} enabled and the behaviour does not change. I have {{maximumAge}} set to zero and a {{timeout}} of 10000 milliseconds.
I am using {{navigator.geolocation.getCurrentPosition}} for each request. {{watchPosition}} does not suit my purpose because I am only updating the database with returned coordinates every 10 seconds.
was:
While requesting a location every 10 seconds using an interval, I consistently see the accuracy of returned positions suddenly jump to several kilometers.
To debug this I saved the accuracy of each location request to an array and each time I tested, the accuracy began at around 10-65 metres then jumped to around 2km on Android and over 10km on iOS after around 6-7 minutes consistently. The returned coordinates continue to be very innaccurate for several minutes and then return to between 10-65 metres.
Here is a subset of the location accuracy array on iOS when the issue is present:
{quote}
[
65,
65,
65,
65,
10079,
10079,
10079,
10079
]
{quote}
As far as I can tell, this issue is only present when the device is not connected to a wifi network. I can reproduce this behaviour on both iOS and Android, while inside and stationary, and while travelling on foot with line of sight to the sky. I have ensured the app remains in the foreground while testing and the device/screen is awake. I make no changes to the App or device when the accuracy decreases.
I have tried with and without {{enableHighAccuracy}} enabled and the behaviour does not change. I have {{maximumAge}} set to zero and a {{timeout}} of 10000 milliseconds.
I am using {{navigator.geolocation.getCurrentPosition}} for each request. {{watchPosition}} does not suit my purpose because I am only updating the database with returned coordinates every 10 seconds.
> Returned location coordinates are very inaccurate after requesting location for a period of time while not connected to wifi
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: CB-13604
> URL: https://issues.apache.org/jira/browse/CB-13604
> Project: Apache Cordova
> Issue Type: Bug
> Components: cordova-android, cordova-ios, cordova-plugin-geolocation
> Affects Versions: 7.0.1
> Environment: OS X 10.12.5
> iOS 10.1.1 iPhone 6s
> Android 7.0 Motorola G4
> Ionic v1 (latest)
> Reporter: Remi Boardman
> Assignee: Joe Bowser
> Labels: accuracy, android, geolocation, ios
>
> While requesting a location every 10 seconds using an interval, I consistently see the accuracy of returned positions suddenly jump to several kilometers. The lat/long of each location request in my App is saved to an external database and is then used to update the marker position on a web based Google Map. At first the marker is in exactly the right place then after several minutes it becomes wildly inaccurate.
> To debug this I saved the accuracy of each location request to an array and each time I tested, the accuracy began at around 10-65 metres then jumped to around 2km on Android and over 10km on iOS after around 6-7 minutes consistently. The returned coordinates continue to be very inaccurate for several minutes and then return to between 10-65 metres.
> Here is a subset of the location accuracy array on iOS when the issue is present:
> {quote}
> [
> 65,
> 65,
> 65,
> 65,
> 10079,
> 10079,
> 10079,
> 10079
> ]
> {quote}
> As far as I can tell, this issue is only present when the device is not connected to a wifi network. I can reproduce this behaviour on both iOS and Android, while inside and stationary, and while travelling on foot with line of sight to the sky. I have ensured the app remains in the foreground while testing and the device/screen is awake. I make no changes to the App or device when the accuracy decreases.
> I have tried with and without {{enableHighAccuracy}} enabled and the behaviour does not change. I have {{maximumAge}} set to zero and a {{timeout}} of 10000 milliseconds.
> I am using {{navigator.geolocation.getCurrentPosition}} for each request. {{watchPosition}} does not suit my purpose because I am only updating the database with returned coordinates every 10 seconds.
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