Open Radar

 
Summary:
Working on an application for a client, we observed issues getting location points. The general goal is to use SLC to track how much kilometres a user do in order to offer vouchers in client application (1km = 1point). Also the tracking is not supposing affect too much the battery usage.

To analyse the problem, we have recreated a sample application logging only the locations reported using Significant Location Changes (SLC) - see 2014_11_04_DebugLocation__S2M_Landsberger_S42_Landsberger_S2M.zip

Steps to Reproduce:
1. Install sample app and grant location permissions
2. Driving in a city (i.e. Berlin, Germany, see attached data) where cell towers coverage is intense
3. Analyse logged data (locations reported, compare with actual run).

- 2 Devices (SIM card with data plan)
/ same Urban track around Berlin
- Around 40 Km
- One device Standalone in background (Device 541, device locked, no power supply...)
- One device Standalone killed within the app switcher before starting the test run (Device 497, device locked, no power supply...) 


Expected Results:
We expected to get more and close location points (500m interval as documentation states) to determine the number of kilometres done.


Actual Results:
A map of presenting real drive done (GoogleEarth.kmz)
Each device folder contains the following data:
/ The app from the device (.xcappdata)
/ The log from the app (.log)
/ The console log (console_log)
/ An info summary ("Info.txt")

Only a hand full of locations have been logged on all devices. Even on the one which has been killed before test run.

Version:
iOS 7.x, see test data for accurate version


Configuration:
iPhone 5s

Attachments: