Sitemap

Amicuk Programming Answers

IPhone 3g only pulled in location of photographs taken in UK and USA

2015-10-11   Views:0

Advertisement

I have returned recently from a cruise , flying out to SIngapore and sailing back to Southampton, calling in at various locations, Thailand ,Malaysia, India, Oman,Jordan, Egypt, Greece and Rome. A great trip, took lots of photographs plus a lot with

I have returned recently from a cruise , flying out to SIngapore and sailing back to Southampton, calling in at various locations, Thailand ,Malaysia, India, Oman,Jordan, Egypt, Greece and Rome.
A great trip, took lots of photographs plus a lot with the iPhone for the GPS location of places. The phone was turned on throughout as normal, with roaming turned off. Shots were imported into Aperture 3 and I was disappointed to find location data only for the shots taken in the Uk at the beginning and end of the trip. Previously I found the same iPhone picked up location data in the USA quite happily with the same standard settings.
Any ideas ?

The replay answer
Advertisement
I posted this question on a photography centred web site and received the following reply, which may be of interest to others, thanks to Nick Bull
Each satellite in the GPS network has a very accurate atomic clock inside which is synchronised to each other (so they all have the same time). The satellites then constantly beam out signals which contains the time it was sent and its precise location in orbit (and a few other bits of information). Using this information from at least four satellites, it is possible for the GPS device (on the ground) to triangulate the location on Earth. There is not, however, any communication between the device and the satellite. The stand-alone GPS device usually needs several minutes is because it takes several iterations of calculations to get the accuracy required. When you start the GPS device again after turning it off, providing a "short time" has elapsed, or the location has not changed sufficiently since the last activation, it is possible to use the previous known location to "assist" the calculations and therefore provide a fix quicker.
The iPhone's GPS system works on a system known as "A-GPS" or Assisted-GPS (although it is more of a hybrid A-GPS). This uses triangulation from cell towers (it works out how long it takes for the signal to reach a number of cell towers whose locations are known and then can work out a rough location). This is then used as a helper for the GPS system to get a lock more accurately and, because you give the algorithms some starting location, it can find the location quicker. There is nothing transmitted through the data connection with regards satellite location as this is transmitted by the actual satellites all the time. If you are using a Wi-Fi connection then there is a system called Skyhook that can provide the iPhone with your location based on the wi-fi network - this is the only time data is sent across the internet to provide location information.
GPS on the iPhone can (and does) work with or without data connection (unless you are relying on the Skyhook system). It can also work when there is no cell signal (you can take your SIM card out and it will still work - you just can't use it in Airplane mode). As long as you have a "clear view" of the sky then it can use the satellite signal to calculate your location. If you are in a city or other area with high structures, there can be problems with the satellite signals bouncing off buildings and giving multi-path errors. The actual calculation and "lock" time can be from 40 seconds to five minutes depending on how many satellites are "visible".
So, to the OP, if you were carrying your phone with you, the GPS system only activates when you use a location-aware app (the camera, maps app, etc). If you just have the phone on, but in your pocket or bag, then the GPS won't be active. When you pull your iPhone out to take a picture, it doesn't know your location and it could take up to 5 minutes to calculate your location. So if you take your phone out, fire up the camera app and take a picture straight away, it won't have time to get your location. In the UK/USA it can triangulate your cell-tower location to give you a rough location (which is usually fairly accurate). It works differently in other countries, I believe, or you didn't have sufficient cell-tower coverage.
I would suggest that you invest in an app called MotionX GPS (they do a lite version too). This can be started and then the screen locked (to save battery) and it will constantly log your GPS location. This GPS track can then be downloaded at the end of your trip and imported into Aperture 3 to geo-tag the photos you have taken. This is the method I have used on many trips abroad without problem.
I'd like to point out that I have nothing to do with MotionX GPS other than being a happy user of their software.
Hope this helps!

Go to See the other 2 answers

IPhone 3g only pulled in location of photographs taken in UK and USA

Category:DefaultRelease time:2015-10-11Views:130

I have returned recently from a cruise , flying out to SIngapore and sailing back to Southampton, calling in at various locations, Thailand ,Malaysia, India, Oman,Jordan, Egypt, Greece and Rome. A great trip, took lots of photographs plus a lot with[More]

How do i recover my lost iphone 4 when i only had the "find my iphone" app, how do i locate it, how do i recover my lost iphone 4 when i only had the "find my iphone" app, how do i locate it

Category:DefaultRelease time:2015-10-11Views:130

how do i recover my lost iphone 4 when i only had the "find my iphone" app, how do i locate it, how do i recover my lost iphone 4 when i only had the "find my iphone" app, how do i locate itAs long as you enabled it when you first acti[More]

HT1688 My daughter and I both have and iPhone.  How do I use my iPhone or the cloud to locate her?

Category:DefaultRelease time:-0001-11-30Views:130

My daugher and I both have an iPhone.  How can I use my iPhone or the cloud to locate her in case of an emergency.  Is there a way to do that without paying for an upgrade or additional services through a separate vendor?? Thanks!find my friend http:[More]

TS4006 When I first opened up "Find My iPhone" on my pc, it located my phone. Now the device button no longer appears on-screen, what do i do?

Category:DefaultRelease time:-0001-11-30Views:130

When I first opened up "Find My iPhone" on my pc, it located my phone. Now the device button no longer appears on-screen, what do i do?Welcome to the Apple community. If you can't remember the password, reset it at... iForgot.comRead other 2 ans[More]

Is there a need for internet on iphone while you wan to locate it when you lost your iphone?

Category:DefaultRelease time:-0001-11-30Views:130

I lost my iphone and I am trying to locate my iphone using the Icloud-Find my iphone, but it shows offline, so I just wanna know if is there  a need for internet service on iphone or it works with the location service only?? Cz it shows offline, help[More]

When I import my photos from my iPhone 4S into iPhoto the location does not appear.  I have to open the info button on the photo click "photo place" then "find on map" and then the location appears.  How to I get the location to appear automatically?

Category:DefaultRelease time:-0001-11-30Views:130

When I import my photos from my iPhone 4S into iPhoto the location does not appear.  I have to open the info button on the photo click "photo place" then "find on map" and then the location appears. How to I get the location to appear[More]

HT5467 When I lost  my iPhone, how can i turn  Location Services on?

Category:DefaultRelease time:-0001-11-30Views:130

When I lost  my iPhone, how can i turn  Location Services on?You need to have the iPhone in your posession to alter that setting. That is something you should have done before it was lost.Read other 2 answers[More]

Computer unable to install device driver software for iPhone 3GS, where do I locate the software? As my phone is in restore mode following update through iTunes...

Category:DefaultRelease time:-0001-11-30Views:130

My computer is unable to install device driver software for iPhone 3GS, where do I locate the software? As my phone is in restore mode following update through iTunes...It's included in the iTunes installation bundle. Re-download and re-install iTune[More]

I've lost my iphone 5. How to locate the phone with the AMEI number?

Category:DefaultRelease time:-0001-11-30Views:130

I've lost my iphone 5. How to locate the phone with the AMEI number?You can't. Only if you set up find my iphone on the phone then you can use icloud to find it.Read other 2 answers[More]

TS4006 Have iCloud doesn't have find iPhone app can I still locate my fone?

Category:DefaultRelease time:-0001-11-30Views:130

Have iCloud doesn't have find iPhone app can I still locate my fone?Welcome to the Apple Community. You can only locate your device when it is logged into iCloud and 'Find My Phone' is enabled, additionally the device will need to be switched on and[More]

I lost my iphone and I use the locate iphone function to wipe to protect my information, but I cannot get the location to restore my iphone, can I request a permanent lock to prevent the thief from using it?

Category:DefaultRelease time:-0001-11-30Views:130

I lost my iphone and I use the locate iphone function to wipe to protect my information, but I cannot get the location to restore my iphone, can I request a permanent lock to prevent the thief from using it?, I call your call centre, your staff said[More]

Hot
I've just decided to teach myself some java, and on my first try something's going wrong and I don't know what it is. I'm currently doing this tutorial: http://java.sun.com/docs/books/tutorial/uiswing/learn/example1.html and everything is good until [More]
Hi all, I have a query that is taking too long and it looks like the cardinality estimates are way off. It seems particulary bas with the hash joins and I don't know how to get the optimizer to get a better estimate. The tables in the query were last [More]
Home Page is too cluttered with stories. Have eliminated some by indicating no interest, but still excessive. How long do you leave a story up? Some are days old.The default home page is ''about:home''. It features little else besides the Firefox log [More]
How can you upload a logo dynamically in smart form and scripts?Hi, Follow the given steps in order to add a logo, 1) In Smart Forms Editor, In left pane, right Click any Page (say Page1) and  select Create -> Window, Give it a name and Description ( [More]
how do i copy a film onto dvd that i have purchased thru i- tunes this is on my desktop and i-padSee these discussions... https://discussions.apple.com/thread/1615930?start=0&tstart=0 https://discussions.apple.com/thread/2722826?start=0&tstart=0Re [More]
I use two voices on my computer (which is a Mac notebook running Snow Leopard), Alex, the standard voice for English, and a German voice, Infovox Juiia. When I try to change from Alex to Julia to have a German languge PDF read aloud, I go to Preferen [More]
I need Mac OS 10.5 to install Mac OS 10.6. on a 2 Ghz Intel Core Duo iMac, but I can't seem to find any free sources of 10.5. Do they exist?You need to buy a Mac OS X 10.6 DVD from the online Apple Store instead of trying to use the free updaters. (7 [More]
Bonjour à toutes et tous Le texte provenant de photoshop pixelise dans adobe encore. Le but étant de survoler une image et la rendre plus clair (50%) pour afficher un texte noir dessus. Je réussi bien à faire la procédure mais le texte n'est pas net [More]
I am trying to remove a dbf file from a project programmatically and in the code have loaded 2 variables. I then call the procedure thus: Do mymanager.queryremovefile with var1, var2 The set procedure command is in the environment set up The called p [More]
Hello, Our GRCI analytics product is on OBIEE 10.1.3.3.2 and OBIEE 10.1.3.3.3. However we have following questions, that would help us in deciding the pricing options for our customers. - Are the corresponding OBI SE1 available out (OTN or SAC) for a [More]