Android :: Geocoding - Accuracy Required In GPS Coordinates
Sep 21, 2010
My question in a nutshell is: Is there a correlation between the number of decimals used in GPS co-ordinates and the accuracy of the location?
Right now I happen to be working with the Android SDK but I'm sure this question can apply to many other geolocation SDKs. Basically, Android returns GPS coordinates with up to 14 digits. That seems like overkill in most situations. Lets say I needed accuracy down to about an area of 10 feet by 10 feet. How many decimals do I really need to worry about? The use-case that I'm looking for is I want to know if a person is north or south of a particular latitude - how many digits would I need to store in the database and how many digits would I need to compare?
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Jun 30, 2010
I've been trying to write a little application that recognizes custom events in Android: you hold your finger over a TextView for a certain length of time, and it changes color.I'm using the MotionEvent coordinates and checking if they are within the bounds of a particular TextView, which is within a table.I am just attaching the onTouch listener to the table within the activity.But I get weird errors: the coordinates seem to be off by one view (i.e. if I touch the view below the view above reacts); or sometimes one will react, and the other will not. Any idea what might be going on?
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Aug 5, 2010
i'm created an application where it consists of 3d rotating cube I want to move the cube with respect to the drag on the screen.In the on touch Listener I'm able to get the x,y coordinates but i don Know how to make those coordinates to map to 3d space.
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Oct 17, 2010
I am trying to Reverse GeoCode current Lat/Long data to just Admin Area and Sub Admin Area using the Geocoder class.
I am using the NETWORK_PROVIDER as the Location provider. Here is the code that I use and it works. The problem is sometimes it does not give me any location sometimes it does.
Android Manifest permissions I am using.
CODE:.............
Here is the rest of the code that does give me correct location from time to time but nothing at other times.
CODE:..............
Are there restrictions with the network providers how frequently you can request location data?
How can I make sure that everytime its run this can give me valid location data.
Thanks in advance for any insight into this.
PS: I have run this code on my real device running Froyo 2.2 (Verizon Wireless). Target API Level 8.
This is what I got from my debugging.
Latitude Longitude is always fetched but the getFromLocation often returns null for the latitude longitude data passed to it. So what should be the workaround? May be pass the Lat/Long info to Google Maps API for reverse geocoding. Will be glad to receive any input.
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May 30, 2010
I have been unable to get reverse geocoding wokring under either 2.1 or 2.2 on the emulators. Tested on both mac/eclipse & ubuntu/eclipse.
I am sending manual decimal coordinates via DDMS and have ACCESS_FINE_LOCATION & INTERNET permissions in my manifest file.
On an actual phone (HTC Desire) it functions properly.
CODE:............
The following code throws the exception below
CODE:..........
I have been looking for docs on this and can find very little information on the above to confirm whether it should or should not work.
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Sep 24, 2010
I recently upgraded my SDK from 7 to 8. One of my applications uses Google GeoCoding, specifically the Geocoder object. After the upgrade, when I call the getFromLocation method, it doesn't return any addresses and I see a message in the logcat to the effect that GLS failed with status 20. My Google Maps API key is working fine because I'm seeing the map tiles, but GeoCoding is broken. It works fine if I run a previous (SDK 7) build of my app.
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Nov 5, 2010
My app makes several calls to getFromLocationName from the android.location.Geocoder; class, this is currently handled in my activity which also displays some data depedant on the results of that call.
This can be quite slow, for example before the activity can load it first has to complete the various calls, and that is reliant on a network connection.
Once I have the results, I don't really need to refresh that (I mean how often do locations and geo coordinates change?)
My question : How can I best avoid having to query for this data each time my app runs. Should I do something with a service that loads them all on startup? (could be quite slow if it has to query 50+ times). OR should I make the call, store results in SQL, then only query next time if I don't currently hold the results?
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Nov 24, 2010
I am getting null pointer exception when I am trying to get lat/long from address using reverse geocoding in Android....
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Oct 27, 2009
I have an application that uses the Google Maps API to geocode distances between lat/long pairs as a way of displaying people near to you on your phone (currently Android, working on iPhone). The issue is that even with a test group of 40 users, we are taking upwards of 10 seconds to do our calculations and send the results back to the users. While 10 seconds sounds like a long time, it's not really an issue as far as the client app goes because it's not a real-time update of people's locations (the updates occur every few minutes). Obviously this is a problem though since we'd obviously love to ramp up to tens or even hundreds of thousands of users. I'm curious if anyone else has any experience in this arena in regards to using the Google Maps API for calculating distances between points for large volumes of data?
As an aside, we're using Rails on the server, which is where all of the location calculations are occurring. The phone(s) are merely displaying the maps and updating the server with lat/long coordinates.
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Nov 24, 2010
After I upgraded to Android SDK 8 I started seeing geocoding failures in the emulator. However, everything was fine on a device. Now my app fails to gecode on 1.5 and 1.6 devices as well as in the emulator. I can't test on a 2.2 device. Perhaps it works OK there.
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Nov 26, 2009
I have been uploading my photos to Flickr using the built in Flickr integration. However, I notice that the geocoding does not get set in my Flickr account. When I browse the photos on my phone's card, the goecoding is in tact. Is this a limitation of Flickr or my Hero?
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Aug 16, 2009
How much accurate are the coordinates received by the GPS antenna in the reality?I'm using the emulator but it doesn't work well with coordinates too much close is there nobody that have tested an application based on the package "Location" in a real device(I don't have a real one yet..) and knows how to answer me?
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Aug 14, 2009
With my location listener i get accuracy values about 30-100 m (being on an open field without annoying houses around me disturbing the gps signal). Why is that so bad? I thought you could get an accuracy about 3m with gps. And the Google maps applet for example has a much better accuracy. How can i improve the accuracy? I'm using the default gps provider. I saw you can create a Criteria object to get the best provider, but there are only the gps and the mobile phone net providers anyway - so it's some kind of senseless to get the location provider that way. is there no way to define the needed accuracy?
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Jul 9, 2010
My app has an issue where many players get bounced all over kingdom come when using GPS to get a signal. I had this issue with my G1 on occasion but not on my Nexus One. I am talking hundreds of miles from their real location. I changed the code to throw out anything that was not at least 500 meters accurate. My question is, if the location placement is hundreds of miles off, how reliable will the accuracy reporting be? Does it realize that it could be hundreds of miles off?
I am asking the community because I cannot reproduce the scenario with what I currently have so I can't test if my fix is meaningful. Does GPS know when its readings are that far off?
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Feb 15, 2010
wanted to know that the accuracy value returned by the getAccuracy() is of which type radial accuracy or horizontal accuracy.
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Nov 6, 2009
If I do Location.getAccuracy() I get a number of meters. Is that number a radius or a diameter? I thought it would be a radius, but Google's MyLocationOverlay uses that value as a diameter.
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Feb 11, 2009
I'm writing a mapping application. In simple terms, it sends some info about the user's current location to a server when the user clicks on a button. I need the location to be absolutely correct, and when I first started to implement LocationListener, I found that it often wasn't. So I've used location.getAccuracy() to check the GPS accuracy, and warn the user - without submitting the data - if the location isn't accurate enough. Code...
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Aug 5, 2010
Im working on an app that use gps My testing devices are Nexus One and Htc Mytouch 3g Slide
So does anyone know how to improve the gps accuracy?
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Nov 2, 2010
I am developing a website which used W3C GeoLocation API to obtain users' position. I try to run the website in Android Emulator and use DDMS / geo fix to send the coordinate to the device. However the coordinate received is inaccurate.
For example, (22.377127, 114.095535) will become (22.370335, 114.08523353). I try to run some Android GPS example from Internet, and the results is just the same. I can certainly say that this is not my program bug. From my observation, it seems like some rounding problem.
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Jul 16, 2009
I'm having a weird problem with GPS accuracy. Basically, I check the GPS accuracy in a background thread after the user clicks a report button, and show the accuracy in a progress dialog, changing second by second. (Code is below.) The following strange thing happens:
1. If the user clicks more or less immediately on the button after taking the phone out, accuracy is unsurprisingly pretty poor to start off with, say more than 100m. But the accuracy never really improves very much while the user is running the background thread. There is some improvement, but it's slow and it never gets very accurate. 2. However, if the user gets the phone out and then waits for several seconds *without* clicking on the button and running the background thread, and *then* clicks on the button, the accuracy quickly improves and becomes very good. When they click on the button, the accuracy shows up as fine - within the same length of time............
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Nov 29, 2009
I am curious about the accuracy of the motorola droid GPS, before installing a golf app. Can these units pinpoint to within a few yards or is the area fairly wide.
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Nov 30, 2009
Has anyone else noticed how far off google navigator is? I have used it a couple times and one time it was almost a mile off from the actual location I wanted to go to. Or am I doing something wrong?
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Jul 29, 2010
Wife and i use latitude gps to track each other. however the accuracy is not very good. It can show she is 2 miles from where she actually is. is there a tweek or another program to help make it more accurate?
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Jul 9, 2009
We are writing an application that uses acceleration sensor data to plot phone's movement in 3D. We are finding gross inconsistencies in the actual data output by the sensor. Also, sampling rates vary greatly from 8 to 200 millis. (using System.currentTimeMillis())
Specifically, when we try to draw a circle with G1 flat on the table all the time (filtering out gravity accel 9.8), most of the time we would get a plot of phone's position that is not a circle at all. Lots of times, it would be close to a straight line. Sometimes, it would start drawing an arc, but would not close the circle shooting off in a random direction.
We tried to eliminate the time variable, by substituting a constant time sampling rate (10 millis) to calculate phones position, but the result was very close to what we had before (shapewise). Also, the acceleration in Z direction when the phone is displaced lying flat on a table (XY plane) varies too by +/- 2 units which is a lot.
I do not think it is an error in our code, as we have checked it many times. If there were an error indeed and the accelerometer worked properly, we would see a consistently wrong depiction of the phone's movement. Unfortunately, repeating the same movement (circle) would produce sometimes wildly differently shaped plots.
It all comes down to us wanting to know if that is indeed the case that the G1 accelerometer is very unreliable and inconsistent device when used for more or less precise measurements? Is there some documentation/facts paper that would tell us just how reliable accelerometer is?
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Oct 14, 2009
I thought I have read somewhere that the accuracy of Android's GPS is about 10cm?
Can anyone verify or correct this? Reason being is that my application I am trying to develop keeps track of locations an user has visited and it would help me out tremendously to know the margin of error I can expect?
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Jan 19, 2010
how does "location accuracy" use a wifi network?
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Mar 19, 2009
I am now beginning an app which will use the compass and tilt sensors to determine a persons heading and line of sight. Can I assume the sensors on devices such as the G1 are fairly accurate or can I expect to run into problems such as the compass being 5-10 degress off etc?
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Dec 17, 2009
Is there a way I can see my phone's raw GPS coordinates, i.e. decimal lat/long? Is it built-in, or is there "an app for that" ? I have an Eris Droid.
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Jun 16, 2010
As said in the Android Reference, the method getAccuracy() of android.location: "Returns the accuracy of the fix in meters. If hasAccuracy() is false, 0.0 is returned." But what does that mean exactly? The diameter or the radius? The Circular Error Probable (CEP), the 95-percentile or something else? I hope they are of the same type in GPS and GSM positioning. Does somebody know where these information are given into the system? As far as i know, are the GSM coordinates returned by a hidden Google API over a Web Service. So no chance to see an exact calculation. But where is the Accuracy of GPS calculated. I thought the GPS receiver only returns a dimensionless DOP value. And with Android 1.5 its not posible to read the NMEA sentences directly.
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Jul 17, 2010
Can GPS on a phone, such as iPhone or Android determine your Z coordinates? I know it certainly has to be able to determine X and Y, well longitude, latitude that is, but what about the Z coordinates? Can it determine your height, and can I obtain height relative to ground?
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