Variations in iPhone GPS accuracy [on hold]Is it possible to post process iPhone GPS data?iPhone app to record 3D location informationAccuracy vs Precision GPSConvert Garmin or iPhone weird GPS CoordinatesAccuracy of GPS and HDOPGood GPS navigation app for iPhone with downloadable OFFLINE maps?Accuracy calculated by GPSReading GPS data from iphone and save data into computer?GPS accuracy threshold standardCellphone GPS accuracy standards?
Bullying boss launched a smear campaign and made me unemployable
What about the virus in 12 Monkeys?
Solving a recurrence relation (poker chips)
Is it inappropriate for a student to attend their mentor's dissertation defense?
How do I deal with an unproductive colleague in a small company?
Why is it a bad idea to hire a hitman to eliminate most corrupt politicians?
I would say: "You are another teacher", but she is a woman and I am a man
What's the in-universe reasoning behind sorcerers needing material components?
iPad being using in wall mount battery swollen
Examples of smooth manifolds admitting inbetween one and a continuum of complex structures
What reasons are there for a Capitalist to oppose a 100% inheritance tax?
How to show a landlord what we have in savings?
How do I gain back my faith in my PhD degree?
Dreadful Dastardly Diseases, or Always Atrocious Ailments
What do you call someone who asks many questions?
Unlock My Phone! February 2018
How does a predictive coding aid in lossless compression?
Can compressed videos be decoded back to their uncompresed original format?
How dangerous is XSS?
What is a romance in Latin?
Intersection Puzzle
Why would the Red Woman birth a shadow if she worshipped the Lord of the Light?
What is the difference between 仮定 and 想定?
Could the museum Saturn V's be refitted for one more flight?
Variations in iPhone GPS accuracy [on hold]
Is it possible to post process iPhone GPS data?iPhone app to record 3D location informationAccuracy vs Precision GPSConvert Garmin or iPhone weird GPS CoordinatesAccuracy of GPS and HDOPGood GPS navigation app for iPhone with downloadable OFFLINE maps?Accuracy calculated by GPSReading GPS data from iphone and save data into computer?GPS accuracy threshold standardCellphone GPS accuracy standards?
I was testing GPS tracking using an iPhone 6S running iOS 12, and I observed the following:
- Testing in Dublin city centre;
- Tested when walking and on a bus;
- Generally, reported position was excellent, within 5-10 meters;
- Walked through Trinity College campus, and when walking across the playing fields in the centre of the campus, position accuracy suddenly degraded so that reported position was +100 meters out;
- Continued walking, and accuracy returned to normal;
- Tested again the following day in the same spot, and accuracy was normal.
I want to understand what might have caused the sudden drop in accuracy, for example:
- Signal interference;
- Other environmental factors;
- Hardware issue;
- Software issue.
It's interesting that the degradation in performance occurred in the most open, least built up section of the route, where I'd have expected fewest problems.
Can anyone suggest what kinds of factors might account for what I observed?
gps iphone
asked 2 days ago
Julian GoacherJulian Goacher
971
New contributor
Julian Goacher is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
put on hold as too broad by PolyGeo♦ 2 days ago
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
|
show 2 more comments
I was testing GPS tracking using an iPhone 6S running iOS 12, and I observed the following:
- Testing in Dublin city centre;
- Tested when walking and on a bus;
- Generally, reported position was excellent, within 5-10 meters;
- Walked through Trinity College campus, and when walking across the playing fields in the centre of the campus, position accuracy suddenly degraded so that reported position was +100 meters out;
- Continued walking, and accuracy returned to normal;
- Tested again the following day in the same spot, and accuracy was normal.
I want to understand what might have caused the sudden drop in accuracy, for example:
- Signal interference;
- Other environmental factors;
- Hardware issue;
- Software issue.
It's interesting that the degradation in performance occurred in the most open, least built up section of the route, where I'd have expected fewest problems.
Can anyone suggest what kinds of factors might account for what I observed?
gps iphone
asked 2 days ago
Julian GoacherJulian Goacher
971
New contributor
Julian Goacher is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
put on hold as too broad by PolyGeo♦ 2 days ago
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
@PolyGeo - I don't really see how I can reword this question to be more specific; yes, it's a broad question, but it regards a specific situation and I'm looking to understand the factors that might be in play in that situation.
– Julian Goacher
2 days ago
You seem to be seeking a list of reasons which is a poor fit for focused Q&A. You could try asking about one theory you have and presenting your evidence and research on just that.
– PolyGeo♦
2 days ago
1
Some cell phones can improve accuracy beyond GPS trilateration through local Wi-Fi scanning and by by measuring signal strength to nearby cellular transceivers. In Dublin, I bet the main cell provider is Vodafone (not sure if there are others like in US) but maybe the drop in accuracy stems from being out of range of Wi-WiFi or Vodafone-owned antennas? I don't know the theory behind it, but those might be additional topics to look into.
– Zipper1365
2 days ago
@PolyGeo - Fair enough, but reason for asking the question was because I didn't have enough info to put a theory together! I understand now that the number of visible satellites in the GPS constellation may have been a factor.
– Julian Goacher
2 days ago
@Zipper1365 Thanks for the info. There's several cellphone providers in Dublin. Would the temporary loss of a base station really knock out accuracy by a factor of 10+? A few things I'm wondering here, whether (1) error correction on the position calculation gets knocked out due to a loss of information (i.e. a base station shutting down); (2) there was a very large crowd on the playing fields the day I had this problem, but I couldn't think of a reason why this would affect GPS positioning - but perhaps the crowd caused the loss of a base station?
– Julian Goacher
2 days ago
|
show 2 more comments
I was testing GPS tracking using an iPhone 6S running iOS 12, and I observed the following:
- Testing in Dublin city centre;
- Tested when walking and on a bus;
- Generally, reported position was excellent, within 5-10 meters;
- Walked through Trinity College campus, and when walking across the playing fields in the centre of the campus, position accuracy suddenly degraded so that reported position was +100 meters out;
- Continued walking, and accuracy returned to normal;
- Tested again the following day in the same spot, and accuracy was normal.
I want to understand what might have caused the sudden drop in accuracy, for example:
- Signal interference;
- Other environmental factors;
- Hardware issue;
- Software issue.
It's interesting that the degradation in performance occurred in the most open, least built up section of the route, where I'd have expected fewest problems.
Can anyone suggest what kinds of factors might account for what I observed?
gps iphone
asked 2 days ago
Julian GoacherJulian Goacher
971
New contributor
Julian Goacher is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I was testing GPS tracking using an iPhone 6S running iOS 12, and I observed the following:
- Testing in Dublin city centre;
- Tested when walking and on a bus;
- Generally, reported position was excellent, within 5-10 meters;
- Walked through Trinity College campus, and when walking across the playing fields in the centre of the campus, position accuracy suddenly degraded so that reported position was +100 meters out;
- Continued walking, and accuracy returned to normal;
- Tested again the following day in the same spot, and accuracy was normal.
I want to understand what might have caused the sudden drop in accuracy, for example:
- Signal interference;
- Other environmental factors;
- Hardware issue;
- Software issue.
It's interesting that the degradation in performance occurred in the most open, least built up section of the route, where I'd have expected fewest problems.
Can anyone suggest what kinds of factors might account for what I observed?
gps iphone
gps iphone
asked 2 days ago
Julian GoacherJulian Goacher
971
New contributor
Julian Goacher is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 days ago
Julian GoacherJulian Goacher
971
New contributor
Julian Goacher is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 days ago
Julian GoacherJulian Goacher
971
New contributor
Julian Goacher is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 days ago
Julian GoacherJulian Goacher
971
asked 2 days ago
Julian GoacherJulian Goacher
971
971
New contributor
Julian Goacher is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Julian Goacher is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Julian Goacher is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
put on hold as too broad by PolyGeo♦ 2 days ago
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
put on hold as too broad by PolyGeo♦ 2 days ago
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
@PolyGeo - I don't really see how I can reword this question to be more specific; yes, it's a broad question, but it regards a specific situation and I'm looking to understand the factors that might be in play in that situation.
– Julian Goacher
2 days ago
You seem to be seeking a list of reasons which is a poor fit for focused Q&A. You could try asking about one theory you have and presenting your evidence and research on just that.
– PolyGeo♦
2 days ago
1
Some cell phones can improve accuracy beyond GPS trilateration through local Wi-Fi scanning and by by measuring signal strength to nearby cellular transceivers. In Dublin, I bet the main cell provider is Vodafone (not sure if there are others like in US) but maybe the drop in accuracy stems from being out of range of Wi-WiFi or Vodafone-owned antennas? I don't know the theory behind it, but those might be additional topics to look into.
– Zipper1365
2 days ago
@PolyGeo - Fair enough, but reason for asking the question was because I didn't have enough info to put a theory together! I understand now that the number of visible satellites in the GPS constellation may have been a factor.
– Julian Goacher
2 days ago
@Zipper1365 Thanks for the info. There's several cellphone providers in Dublin. Would the temporary loss of a base station really knock out accuracy by a factor of 10+? A few things I'm wondering here, whether (1) error correction on the position calculation gets knocked out due to a loss of information (i.e. a base station shutting down); (2) there was a very large crowd on the playing fields the day I had this problem, but I couldn't think of a reason why this would affect GPS positioning - but perhaps the crowd caused the loss of a base station?
– Julian Goacher
2 days ago
|
show 2 more comments
@PolyGeo - I don't really see how I can reword this question to be more specific; yes, it's a broad question, but it regards a specific situation and I'm looking to understand the factors that might be in play in that situation.
– Julian Goacher
2 days ago
You seem to be seeking a list of reasons which is a poor fit for focused Q&A. You could try asking about one theory you have and presenting your evidence and research on just that.
– PolyGeo♦
2 days ago
1
Some cell phones can improve accuracy beyond GPS trilateration through local Wi-Fi scanning and by by measuring signal strength to nearby cellular transceivers. In Dublin, I bet the main cell provider is Vodafone (not sure if there are others like in US) but maybe the drop in accuracy stems from being out of range of Wi-WiFi or Vodafone-owned antennas? I don't know the theory behind it, but those might be additional topics to look into.
– Zipper1365
2 days ago
@PolyGeo - Fair enough, but reason for asking the question was because I didn't have enough info to put a theory together! I understand now that the number of visible satellites in the GPS constellation may have been a factor.
– Julian Goacher
2 days ago
@Zipper1365 Thanks for the info. There's several cellphone providers in Dublin. Would the temporary loss of a base station really knock out accuracy by a factor of 10+? A few things I'm wondering here, whether (1) error correction on the position calculation gets knocked out due to a loss of information (i.e. a base station shutting down); (2) there was a very large crowd on the playing fields the day I had this problem, but I couldn't think of a reason why this would affect GPS positioning - but perhaps the crowd caused the loss of a base station?
– Julian Goacher
2 days ago
@PolyGeo - I don't really see how I can reword this question to be more specific; yes, it's a broad question, but it regards a specific situation and I'm looking to understand the factors that might be in play in that situation.
– Julian Goacher
2 days ago
@PolyGeo - I don't really see how I can reword this question to be more specific; yes, it's a broad question, but it regards a specific situation and I'm looking to understand the factors that might be in play in that situation.
– Julian Goacher
2 days ago
You seem to be seeking a list of reasons which is a poor fit for focused Q&A. You could try asking about one theory you have and presenting your evidence and research on just that.
– PolyGeo♦
2 days ago
You seem to be seeking a list of reasons which is a poor fit for focused Q&A. You could try asking about one theory you have and presenting your evidence and research on just that.
– PolyGeo♦
2 days ago
1
1
Some cell phones can improve accuracy beyond GPS trilateration through local Wi-Fi scanning and by by measuring signal strength to nearby cellular transceivers. In Dublin, I bet the main cell provider is Vodafone (not sure if there are others like in US) but maybe the drop in accuracy stems from being out of range of Wi-WiFi or Vodafone-owned antennas? I don't know the theory behind it, but those might be additional topics to look into.
– Zipper1365
2 days ago
Some cell phones can improve accuracy beyond GPS trilateration through local Wi-Fi scanning and by by measuring signal strength to nearby cellular transceivers. In Dublin, I bet the main cell provider is Vodafone (not sure if there are others like in US) but maybe the drop in accuracy stems from being out of range of Wi-WiFi or Vodafone-owned antennas? I don't know the theory behind it, but those might be additional topics to look into.
– Zipper1365
2 days ago
@PolyGeo - Fair enough, but reason for asking the question was because I didn't have enough info to put a theory together! I understand now that the number of visible satellites in the GPS constellation may have been a factor.
– Julian Goacher
2 days ago
@PolyGeo - Fair enough, but reason for asking the question was because I didn't have enough info to put a theory together! I understand now that the number of visible satellites in the GPS constellation may have been a factor.
– Julian Goacher
2 days ago
@Zipper1365 Thanks for the info. There's several cellphone providers in Dublin. Would the temporary loss of a base station really knock out accuracy by a factor of 10+? A few things I'm wondering here, whether (1) error correction on the position calculation gets knocked out due to a loss of information (i.e. a base station shutting down); (2) there was a very large crowd on the playing fields the day I had this problem, but I couldn't think of a reason why this would affect GPS positioning - but perhaps the crowd caused the loss of a base station?
– Julian Goacher
2 days ago
@Zipper1365 Thanks for the info. There's several cellphone providers in Dublin. Would the temporary loss of a base station really knock out accuracy by a factor of 10+? A few things I'm wondering here, whether (1) error correction on the position calculation gets knocked out due to a loss of information (i.e. a base station shutting down); (2) there was a very large crowd on the playing fields the day I had this problem, but I couldn't think of a reason why this would affect GPS positioning - but perhaps the crowd caused the loss of a base station?
– Julian Goacher
2 days ago
|
show 2 more comments
0
active
oldest
votes
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
@PolyGeo - I don't really see how I can reword this question to be more specific; yes, it's a broad question, but it regards a specific situation and I'm looking to understand the factors that might be in play in that situation.
– Julian Goacher
2 days ago
You seem to be seeking a list of reasons which is a poor fit for focused Q&A. You could try asking about one theory you have and presenting your evidence and research on just that.
– PolyGeo♦
2 days ago
1
Some cell phones can improve accuracy beyond GPS trilateration through local Wi-Fi scanning and by by measuring signal strength to nearby cellular transceivers. In Dublin, I bet the main cell provider is Vodafone (not sure if there are others like in US) but maybe the drop in accuracy stems from being out of range of Wi-WiFi or Vodafone-owned antennas? I don't know the theory behind it, but those might be additional topics to look into.
– Zipper1365
2 days ago
@PolyGeo - Fair enough, but reason for asking the question was because I didn't have enough info to put a theory together! I understand now that the number of visible satellites in the GPS constellation may have been a factor.
– Julian Goacher
2 days ago
@Zipper1365 Thanks for the info. There's several cellphone providers in Dublin. Would the temporary loss of a base station really knock out accuracy by a factor of 10+? A few things I'm wondering here, whether (1) error correction on the position calculation gets knocked out due to a loss of information (i.e. a base station shutting down); (2) there was a very large crowd on the playing fields the day I had this problem, but I couldn't think of a reason why this would affect GPS positioning - but perhaps the crowd caused the loss of a base station?
– Julian Goacher
2 days ago