altitude

问题 I have been using a Samsung Galaxy S3 to work on an app that uses the barometer estimate the user's altitude. I use SensorManager.getAltitude(p0, p), and set p0 equal to the sea-level pressure reported at the nearest airport. I set p equal to the value returned by the barometer. Unfortunately, the altitude returned is systematically 20 meters or so higher than what it actually is. I'm certain that the barometer is returning pressure values that are too low, so SensorManager.getAltitude is

问题 I found an alternative way to obtain altitude by using SensorManager but it requires two paramaters. public static float getAltitude (float p0, float p) Computes the Altitude in meters from the atmospheric pressure and the pressure at sea level. p0 pressure at sea level p atmospheric pressure Would you teach us on how to use it by practical example/code snippet. UPDATES1 I found web service provider (WSP) url to obtain the p0 pressure at sea level . I have successfully get the value but don't

问题 I have application using Android 2.1 which utilize LocationManager to get the altitude. But now, I need to obtain the altitude using SensorManager which requires API Level 9 (2.3). How can I put the SensorManager.getAltitude(float, float) in my 2.1 android application by putting a condition and calling it by a function name (possible in normal Java)? Thank you in advance UPDATE 1 If you have noticed that my application need to be compiled using Android 2.1. That's why I'm looking for a way to

问题 I tried to find how to get the altitude above the mean sea level. At this time, it returns altitude from the ellipsoid. So, anyone knows the formula or calculation to change the altitude value from ellipsoid to the altitude value from mean sea level. Thank you for all help 回答1: As you mentioned, GPS returns the altitude as an offset from the WGS84 reference ellipsoid, but most people want to see mean sea level (MSL), and the two frequently don't agree. The way this is most frequently done is

问题 Is there a way to obtain altitude aside from Location.getAltitude()? I've heard using Sensor but don't have idea and can't find on net. UPDATES1 I found SensorManager.getAltitude(float, float) using API Level 9 up but don't have idea on how to implement it. Would you share with us. 回答1: I know it's late but for anyone looking for it, that might help import android.app.Activity; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener;

问题 UPDATE: using the sample from here - http://code.msdn.microsoft.com/wpapps/Location-sample-f11aa4e7 and adding an altitude readout I get the same thing as my code. Poor accuracy is being off by 50ft. Going back and forth between 720 (correct) and 300 ft means something is wrong. I just can't see where... I'm starting to make a GPS tracking app for windows phone 8 but something is going haywire. In my app, (and in the sample location app) i get some readings that are correct and others that

问题 I understand the concept of negative for below sea levels and positive for above + there is vertical accuracy to check the sanity of this value. I am interested in GPS data in a flight. What could be the max or approx max value of altitude so that I can differentiate Flight from road travel. I understand I can query the speed but speed itself won't solve the purpose. 回答1: The proper way to determine flight from GPS altitude is to lookup the ground elevation of the current location (latitude

问题 Does anyone know if there is a tool in R to find the height above sea level of a location, given the latitude and longitude ? 回答1: Or you can use the package that looks up from geonames, and get the value from the srtm3 digital elevation model: > require(geonames) > GNsrtm3(54.481084,-3.220625) srtm3 lng lat 1 797 -3.220625 54.48108 or the gtopo30 model: > GNgtopo30(54.481084,-3.220625) gtopo30 lng lat 1 520 -3.220625 54.48108 geonames is on CRAN so install.packages("geonames") will get it.

问题 I've been having trouble finding a way to get the altitude of the device. Could someone give me a pointer or put together a short script that gets the altitude of the device and prints it? Only in swift. Thanks! 回答1: Import CoreLocation import CoreLocation Create a locationManger variable var locationManager:CLLocationManager = CLLocationManager() Initialize and start updating location override func viewDidLoad() { super.viewDidLoad() self.locationManager = CLLocationManager() locationManager

问题 I want to be able to capture altitude in my Android app. I know I can use GPS for where I am, but is there any way I can derive roughly how high the phone is off the ground using a combination of sensors? If not, what is the closest estimation I can get? 回答1: If the phone has a barometric pressure sensor, you can use SensorManager.getAltitude to get the altitude based on a pressure reading. This method also requires the current pressure at sea level, which can either be obtained from local