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2014/10/15 ¤U¤È 10:03:29
iphone Programming Glossary: accuracyOptimizing CLLocationManager/CoreLocation to retrieve data points faster on the iPhone http://stackoverflow.com/questions/1081219/optimizing-cllocationmanager-corelocation-to-retrieve-data-points-faster-on-the My calculations are darn accurate the problem is it takes far too long to collect 10 samples. I'll paste my filters accuracy respective code below. If anyone can comment on how I can speed this up that would be great. Until I speed it up it's rather.. CLLocation oldLocation if newLocation.horizontalAccuracy 0.0f newLocation.horizontalAccuracy 120.0f roughly an accuracy of 120 meters we can adjust this. myLocs addObject newLocation Thanks for any optimization tricks to speed this up. iphone.. in Apple's code for this in the FlipsideViewController MyCLController sharedInstance .locationManager.desiredAccuracy accuracyToSet MyCLController sharedInstance .locationManager.distanceFilter filterToSet This approach works and causes no errors...
iphone: Calculating battery life http://stackoverflow.com/questions/1469549/iphone-calculating-battery-life a 5 increment is reached. Seems to me that if all you're given is change notifications at 5 changes up or down accuracy is not something you can calculate very well or quickly. A 5 change could take a very long time if the device isn't doing..
Do iPhone / Android browsers support CSS @media handheld? http://stackoverflow.com/questions/3893342/do-iphone-android-browsers-support-css-media-handheld of max device width of 480px . Apple for the iPhone though this is from memory so I can't be entirely sure of its accuracy chose to disregard the use of handheld or mobile stylesheets since it and other iOS devices were capable of rendering css..
iOS: Movement Precision in 3D Space http://stackoverflow.com/questions/5550453/ios-movement-precision-in-3d-space Movement Precision in 3D Space From what I understand GPS has limited accuracy. Is it possible to get a more precise location for a person in 3D space I'm planning to write an application where users.. to move a few feet. Is there any technique maybe with the accelerometer and gyroscope that would enable this degree of accuracy For example the user holds the phone flat so that the bottom of the phone runs parallel with the floor . There is something..
Distance moved by Accelerometer http://stackoverflow.com/questions/6645126/distance-moved-by-accelerometer between 37 00 38 25 in the video. Similar questions track small movements of iphone with no GPS What is the real world accuracy of phone accelerometers when used for positioning how to calculate phone's movement in the vertical direction from rest..
How can I get a precise time, for example in milliseconds in Objective-C? http://stackoverflow.com/questions/889380/how-can-i-get-a-precise-time-for-example-in-milliseconds-in-objective-c NSDate and the timeIntervalSince methods will return a NSTimeInterval which is a double with sub millisecond accuracy. NSTimeInterval is in seconds but it uses the double to give you greater precision. In order to calculate millisecond time.. is in seconds but it uses the double to give you greater precision. In order to calculate millisecond time accuracy you can do Get a current time for where you want to start measuring from NSDate date NSDate date do work... Find elapsed..
Export SQLite data to Excel in iOS programmatically http://stackoverflow.com/questions/11132900/export-sqlite-data-to-excel-in-ios-programmatically NSLog @ No space available in @ filename TODO UIAlertView else NSString header @ Source Time Latitude Longitude Accuracy n NSInteger result output write header UTF8String maxLength header length if result 0 NSLog @ exportCsv encountered error.. d from header write result BOOL errorLogged NO NSString sqlStatement @ select timestamp latitude longitude horizontalAccuracy from my_sqlite_table Setup the SQL Statement and compile it for faster access sqlite3_stmt compiledStatement if sqlite3_prepare_v2..
http://stackoverflow.com/questions/221592/geolocation-api-on-the-iphone false' html.push p Longitude location.coords.longitude p html.push p Latitude location.coords.latitude p html.push p Accuracy location.coords.accuracy meters p message.innerHTML html.join function errorHandler error alert 'Attempt to get location..
Corelocation framework does not produce accurate distances http://stackoverflow.com/questions/3118773/corelocation-framework-does-not-produce-accurate-distances alloc init locationManager.delegate self locationManager.distanceFilter 150.0f locationManager.desiredAccuracy kCLLocationAccuracyBest locationManager startUpdatingLocation oldLocat CLLocation alloc init newLocat CLLocation alloc init.. init locationManager.delegate self locationManager.distanceFilter 150.0f locationManager.desiredAccuracy kCLLocationAccuracyBest locationManager startUpdatingLocation oldLocat CLLocation alloc init newLocat CLLocation alloc init void locationManager.. manager didUpdateToLocation CLLocation newLocation fromLocation CLLocation oldLocation if newLocation.horizontalAccuracy 60.0 return data is too long ago don't use it NSLog @ oldd @ oldLocation self.oldLocat oldLocation self.newLocat newLocation..
http://stackoverflow.com/questions/3515158/iphone-gps-accuracy GPS Accuracy as I am developing for iPhone I've just bought an iPhone 4 to test my application which needs to measure the coordinates..
How to measure distance between two iphone devices using bluetooth? http://stackoverflow.com/questions/3624945/how-to-measure-distance-between-two-iphone-devices-using-bluetooth on my iPhone application. My iPhone is connected to another iPhone Harry's iPhone. In this case Distance 3m 45.3cm Accuracy milimeter Direction North East one of 8 available directions Does anyone know how to do this If I get the answer that'll..
Face Detection on iPhone using OpenCV and LBP http://stackoverflow.com/questions/4921260/face-detection-on-iphone-using-opencv-and-lbp would be appreciated including other optimization techniques and Google links that I may have missed in my searching. Accuracy of detection is not critical so long as it is reasonably effective. Thanks iphone xcode optimization opencv face detection..
Requesting iPhone location whilst in background? http://stackoverflow.com/questions/5807560/requesting-iphone-location-whilst-in-background run all the time using UIBackgroundModes location . Not recommended drains battery. Regularity upon request Accuracy approx. 10 65m. Might just be the only realistic option. Option_002 SLC I could use Significant Location Change but the.. if the application is running in a rural or wilderness area with limited numbers of cell towers. Regularity unknown Accuracy approx. 500m Option_003 Hybrid I could use Significant Location Change SLC in the background as an indicator of significant.. SLC in the background as an indicator of significant movement and then request an GPS location based on kCLLocationAccuracyBest. This would work but the SLC events are not going to arrive at anywhere near 30second intervals particularly when walking..
Show GPS availabilty and Accuracy in Iphone SDK http://stackoverflow.com/questions/5897204/show-gps-availabilty-and-accuracy-in-iphone-sdk GPS availabilty and Accuracy in Iphone SDK Please anyone tell how to program to show the GPS availability and Accuracy level in an iphone. and it has.. GPS availabilty and Accuracy in Iphone SDK Please anyone tell how to program to show the GPS availability and Accuracy level in an iphone. and it has to wipe the previous lat lon info in label. iphone gps share improve this question There..
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