Real-World Android Location Data
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Location data can be far more accurate than Google’s conservative estimates. This presentation examines the accuracy of real-world data in comparison to the theoretical accuracy.
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Real-World Android Location Data
- 1. Real-World Location Data on Android Marc Fasel, @marcfasel Shine Technologies, http://blog.shinetech.com Android At Stack Overflow @androidatso
- 3. Shine Technologies Specialises in Enterprise software development
- 4. Shine Technologies Specialises in Enterprise software development Clients include major Blue Chip corporations
- 5. Shine Technologies Specialises in Enterprise software development Clients include major Blue Chip corporations Develops both iOS and Android applications for clients
- 6. Shine Technologies Specialises in Enterprise software development Clients include major Blue Chip corporations Develops both iOS and Android applications for clients Has been developing on Android since ADP-1
- 8. Location-Based Services Task Figure out when a person is at work
- 9. Location-Based Services Task Figure out when a person is at work Assumptions
- 10. Location-Based Services Task Figure out when a person is at work Assumptions 30m radius around workplace location
- 11. Location-Based Services Task Figure out when a person is at work Assumptions 30m radius around workplace location Update interval 5 min
- 12. Location-Based Services Task Figure out when a person is at work Assumptions 30m radius around workplace location Update interval 5 min Environment: Indoors and Outdoors
- 13. Location-Based Services Task Figure out when a person is at work Assumptions 30m radius around workplace location Update interval 5 min Environment: Indoors and Outdoors Background task
- 14. Location-Based Services Task Figure out when a person is at work Assumptions 30m radius around workplace location Update interval 5 min Environment: Indoors and Outdoors Background task
- 16. Location Provider Generic Name Actual Provider Fine-grained GPS Coarse-grained Network
- 17. Location Provider Generic Name Actual Provider Fine-grained GPS Coarse-grained Network
- 18. Location Provider Generic Name Actual Provider Fine-grained GPS Coarse-grained Network
- 19. Theoretical Accuracy Generic Name Actual Provider Accuracy Fine-grained GPS < 100 m Coarse-grained Network 100 m - 1000m
- 20. Theoretical Accuracy Generic Name Actual Provider Accuracy Fine-grained GPS < 100 m Coarse-grained Network 100 m - 1000m
- 21. Theoretical Accuracy Generic Name Actual Provider Accuracy Fine-grained GPS < 100 m Coarse-grained Network 100 m - 1000m
- 22. Theoretical Accuracy Generic Name Actual Provider Accuracy What?? Fine-grained GPS < 100 m Coarse-grained Network 100 m - 1000m
- 24. Practical Accuracy e ry ! y s t M
- 25. Research
- 26. Research
- 27. Research
- 28. GPS Provider
- 29. GPS Provider Theoretical accuracy < 100m
- 30. GPS Provider Theoretical accuracy < 100m Uses satellites to provide location
- 31. GPS Provider Theoretical accuracy < 100m Uses satellites to provide location Theoretical update interval: Seconds
- 34. Another Example
- 35. Power Consumption State Power Consumption Stand-By 8 mA Idle 83 mA GPS 135 mA Mohamed Amir, “Energy-Aware Location Provider for the Android Platform”, http://www.mamir.net/masters/ mamir_thesis.pdf
- 36. Power Consumption State Power Consumption Stand-By 8 mA Idle 83 mA GPS 135 mA Mohamed Amir, “Energy-Aware Location Provider for the Android Platform”, http://www.mamir.net/masters/ mamir_thesis.pdf
- 37. Power Consumption State Power Consumption Stand-By 8 mA Idle 83 mA GPS 135 mA Mohamed Amir, “Energy-Aware Location Provider for the Android Platform”, http://www.mamir.net/masters/ mamir_thesis.pdf
- 38. Power Consumption State Power Consumption Stand-By 8 mA Idle 83 mA GPS 135 mA Mohamed Amir, “Energy-Aware Location Provider for the Android Platform”, http://www.mamir.net/masters/ mamir_thesis.pdf
- 40. GPS Provider Verdict Theoretical accuracy < 100m
- 41. GPS Provider Verdict Theoretical accuracy < 100m Practical accuracy: 2m -20 m
- 42. GPS Provider Verdict Theoretical accuracy < 100m Practical accuracy: 2m -20 m Power consumption: Outrageous
- 43. GPS Provider Verdict Theoretical accuracy < 100m Practical accuracy: 2m -20 m Power consumption: Outrageous Notification interval: Theoretically high, practically low
- 44. GPS Provider Verdict Theoretical accuracy < 100m Practical accuracy: 2m -20 m Power consumption: Outrageous Notification interval: Theoretically high, practically low Environment: Outdoor only
- 45. Network Provider
- 46. Network Provider Theoretical accuracy: 100m - 1000m
- 47. Network Provider Theoretical accuracy: 100m - 1000m Mix of WiFi Hotspots and Cell towers for location
- 48. Network Provider Theoretical accuracy: 100m - 1000m Mix of WiFi Hotspots and Cell towers for location Needs Internet access
- 49. Network Provider Theoretical accuracy: 100m - 1000m Mix of WiFi Hotspots and Cell towers for location Needs Internet access Power consumption: Low
- 53. Network Provider Data Google Location Server
- 54. Network Provider Data Google Location Server Contains WiFi and Cell Tower IDs with location
- 55. Network Provider Data Google Location Server Contains WiFi and Cell Tower IDs with location GPS users provide the data for Network users
- 56. Network Provider Data Google Location Server Contains WiFi and Cell Tower IDs with location GPS users provide the data for Network users When using GPS your coordinates are sent with WiFi and Cell Tower IDs to Google Location Server
- 57. Network Provider Data Google Location Server Contains WiFi and Cell Tower IDs with location GPS users provide the data for Network users When using GPS your coordinates are sent with WiFi and Cell Tower IDs to Google Location Server When using the Network provider you give nearby WiFi and Cell Tower IDs and get back coordinates
- 58. Wrong Location
- 59. GPS and Network
- 60. GPS and Network
- 61. GPS and Network
- 63. Network Provider Verdict Theoretical accuracy: 100m - 1000m
- 64. Network Provider Verdict Theoretical accuracy: 100m - 1000m Practical accuracy: 25m - 50 m
- 65. Network Provider Verdict Theoretical accuracy: 100m - 1000m Practical accuracy: 25m - 50 m Power consumption: Low
- 66. Network Provider Verdict Theoretical accuracy: 100m - 1000m Practical accuracy: 25m - 50 m Power consumption: Low Update interval: 1 Minute
- 67. Network Provider Verdict Theoretical accuracy: 100m - 1000m Practical accuracy: 25m - 50 m Power consumption: Low Update interval: 1 Minute Environment: Indoors and Outdoors
- 68. Task
- 69. Task Figure out when a person is at work
- 70. Task Figure out when a person is at work Assumptions
- 71. Task Figure out when a person is at work Assumptions 30m radius around workplace location
- 72. Task Figure out when a person is at work Assumptions 30m radius around workplace location Update interval 5 min
- 73. Task Figure out when a person is at work Assumptions 30m radius around workplace location Update interval 5 min Background task
- 74. Task Figure out when a person is at work Assumptions 30m radius around workplace location Update interval 5 min Background task Environment: Indoors and Outdoors
- 75. Task Figure out when a person is at work Assumptions 30m radius around workplace location Update interval 5 min Background task Environment: Indoors and Outdoors Winner is: Network provider!
- 76. Conclusion
- 77. Conclusion Practical Accuracy is much better for both GPS and Network Provider
- 78. Conclusion Practical Accuracy is much better for both GPS and Network Provider Examine real-world data for location-based services
- 79. Conclusion Practical Accuracy is much better for both GPS and Network Provider Examine real-world data for location-based services Both providers have strengths and weaknesses
- 80. Conclusion Practical Accuracy is much better for both GPS and Network Provider Examine real-world data for location-based services Both providers have strengths and weaknesses Consider a combination of providers at different intervals
- 81. Questions?
Notes de l'éditeur
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- 12/08 ADP-1 goes on sale\n\n
- 12/08 ADP-1 goes on sale\n\n
- 12/08 ADP-1 goes on sale\n\n
- 12/08 ADP-1 goes on sale\n\n
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- Passive: GPS or Network\n
- Passive: GPS or Network\n
- Passive: GPS or Network\n
- My inspiration just lost me!\n\nIf Google Maps Developers would have known these specs they would never have tried to put your location on a map\n
- My inspiration just lost me!\n\nIf Google Maps Developers would have known these specs they would never have tried to put your location on a map\n
- My inspiration just lost me!\n\nIf Google Maps Developers would have known these specs they would never have tried to put your location on a map\n
- My inspiration just lost me!\n\nIf Google Maps Developers would have known these specs they would never have tried to put your location on a map\n
- Mystery!\n
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- Anomalies\n1) Exact location outside circle of accuracy\n2) No data indoors or in areas of bad reception\n
- Minimum notification interval: 1 sec\nBecause of high Power consumption the Android Developer Guide recommends a minimum notification interval of 10 minutes for background apps\n
- Masters Thesis: Mohamed Amir\nEnergy-Aware Location Provider on the Android Platform\n\n
- Masters Thesis: Mohamed Amir\nEnergy-Aware Location Provider on the Android Platform\n\n
- Masters Thesis: Mohamed Amir\nEnergy-Aware Location Provider on the Android Platform\n\n
- Masters Thesis: Mohamed Amir\nEnergy-Aware Location Provider on the Android Platform\n\n
- 1 1/2 times more power than idle phone\n15 times more power than phone on stand-by \n
- 1 1/2 times more power than idle phone\n15 times more power than phone on stand-by \n
- 1 1/2 times more power than idle phone\n15 times more power than phone on stand-by \n
- 1 1/2 times more power than idle phone\n15 times more power than phone on stand-by \n
- 1 1/2 times more power than idle phone\n15 times more power than phone on stand-by \n
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- Anomaly\n1) Network provider placed me in Brighton\n
- In urban areas cell towers are numerous: 550 cell towers just in Postcode 3000, <4 sqkm \nIn suburban areas cell towers are 2-3km apart\n
- In urban areas cell towers are numerous: 550 cell towers just in Postcode 3000, <4 sqkm \nIn suburban areas cell towers are 2-3km apart\n
- In urban areas cell towers are numerous: 550 cell towers just in Postcode 3000, <4 sqkm \nIn suburban areas cell towers are 2-3km apart\n
- In urban areas cell towers are numerous: 550 cell towers just in Postcode 3000, <4 sqkm \nIn suburban areas cell towers are 2-3km apart\n
- In urban areas cell towers are numerous: 550 cell towers just in Postcode 3000, <4 sqkm \nIn suburban areas cell towers are 2-3km apart\n
- Network provider placed me in the wrong location, because the WiFi network I was close to had moved location\n
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