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2014/10/16 ¤W¤È 08:12:14
android Programming Glossary: declinationcalculate acceleration in reference to true north http://stackoverflow.com/questions/14963190/calculate-acceleration-in-reference-to-true-north the device orientation to magnetic north and apply the declination to it to get the orientation to true north. Then I want to calculate.. and SensorManager.getOrientation . Then I get the declination by GeomagneticField.getDeclination and apply it on the azimuth..
Calculate compass bearing / heading to location in Android http://stackoverflow.com/questions/4308262/calculate-compass-bearing-heading-to-location-in-android east of true north. myLocation.bearingTo destLocation c declination the difference between true north and magnetic north The heading.. rather than true north. First adjust your heading with the declination heading geoField.getDeclination Second you need to offset the.. east of true north. So after you've compensated for the declination you can use the formula below to get the desired result heading..
android compass seems unreliable http://stackoverflow.com/questions/6256256/android-compass-seems-unreliable NOT calibrate at all. NOTE you do have to account for declination for a true north offset which you can do with the API in android.. coordinates altitude time of day etc. the problem was NOT declination and if you are comparing to a compass that's not an issue anyway..
Rotating an ImageView like a compass (with the “north pole” set elsewhere) http://stackoverflow.com/questions/7978618/rotating-an-imageview-like-a-compass-with-the-north-pole-set-elsewhere lets head on to the azimuth You need to substract the declination instead of adding it as we want azimuth to be 0 when we point.. the phone directly at true north instead of having the declination added to the azimuth which will then give us double the declination.. added to the azimuth which will then give us double the declination when we point the phone to true north. Correct this by subtracting..
calculate acceleration in reference to true north http://stackoverflow.com/questions/14963190/calculate-acceleration-in-reference-to-true-north my device in reference to true north. My idea was to calculate the device orientation to magnetic north and apply the declination to it to get the orientation to true north. Then I want to calculate the acceleration of the device and reference it to.. to get the device orientation using SensorManager.getRotationMatrix and SensorManager.getOrientation . Then I get the declination by GeomagneticField.getDeclination and apply it on the azimuth of the orientation values from SensorManager.getOrientation..
Calculate compass bearing / heading to location in Android http://stackoverflow.com/questions/4308262/calculate-compass-bearing-heading-to-location-in-android your location to the destination location. This is in degrees east of true north. myLocation.bearingTo destLocation c declination the difference between true north and magnetic north The heading that is returned from the magnetometer accelermometer is.. where you are facing in relation to your destination object rather than true north. First adjust your heading with the declination heading geoField.getDeclination Second you need to offset the direction in which the phone is facing heading from the target.. The bearing gives you the angle of your destination in degrees east of true north. So after you've compensated for the declination you can use the formula below to get the desired result heading myBearing myBearing heading You'll then want to convert..
android compass seems unreliable http://stackoverflow.com/questions/6256256/android-compass-seems-unreliable precision compass and more than a few times they would simply NOT calibrate at all. NOTE you do have to account for declination for a true north offset which you can do with the API in android if you have access to the current GPS coordinates altitude.. the API in android if you have access to the current GPS coordinates altitude time of day etc. the problem was NOT declination and if you are comparing to a compass that's not an issue anyway since it will also be effected by local magnetic fields...
Rotating an ImageView like a compass (with the “north pole” set elsewhere) http://stackoverflow.com/questions/7978618/rotating-an-imageview-like-a-compass-with-the-north-pole-set-elsewhere 0 bearTo 100 360 360 100 260 We've now sorted out the bearingTo lets head on to the azimuth You need to substract the declination instead of adding it as we want azimuth to be 0 when we point the phone directly at true north instead of having the declination.. instead of adding it as we want azimuth to be 0 when we point the phone directly at true north instead of having the declination added to the azimuth which will then give us double the declination when we point the phone to true north. Correct this.. phone directly at true north instead of having the declination added to the azimuth which will then give us double the declination when we point the phone to true north. Correct this by subtracting the declination instead of adding it. azimuth geoField.getDeclination..
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