Barometric Altimeter

Barometric Altimeter


The altitude is computed from the local barometric pressure using the 1976 standard earth atmosphere formula. This formula, apparently works best at about 45 deg latitude, so if you are near the equator, like I am, then the default average elevation will be slightly offset from reality.

The observed value altitude can be calibrated, when the elevation at a location is already known. The approximate ground level elevation of where you are can be got from Google Maps.

Since the barometric pressure varies with the weather, this application may not give accurate results over a long period of time (say several hours), but the relative altitude/elevation is quite accurate for periods of ten's of minutes to less than an hour.

The rate of change of altitude is computed, which is useful to see how fast an elevator goes, or perhaps for skydivers, paragliders or birds.

Important note on Data Recording: Since the Android O/S is not meant to support an App running continuously as a background process, the only reliable way to continuously record data with this app, is to ensure that it is always a foreground process.

Keywords: Barometer Altimeter Altitude Elevation Pressure

Recent changes:
Please goto https://sites.google.com/site/msanders59/barometric-altimeter for user hints.

New features:

1. Added option to record data to the SD card.
2. Show the elevation and pressure values on the Plot Screen.
3. general UI enhancements and bug fixes.
4. Need two extra permissions for the new features. These are to write to external-storage-device, and wake-lock.
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Free
85
4.3
User ratings
51
Installs
10,000+
Concerns
0
File size
0 kb
Screenshots
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About Barometric Altimeter
The altitude is computed from the local barometric pressure using the 1976 standard earth atmosphere formula. This formula, apparently works best at about 45 deg latitude, so if you are near the equator, like I am, then the default average elevation will be slightly offset from reality.

The observed value altitude can be calibrated, when the elevation at a location is already known. The approximate ground level elevation of where you are can be got from Google Maps.

Since the barometric pressure varies with the weather, this application may not give accurate results over a long period of time (say several hours), but the relative altitude/elevation is quite accurate for periods of ten's of minutes to less than an hour.

The rate of change of altitude is computed, which is useful to see how fast an elevator goes, or perhaps for skydivers, paragliders or birds.

Important note on Data Recording: Since the Android O/S is not meant to support an App running continuously as a background process, the only reliable way to continuously record data with this app, is to ensure that it is always a foreground process.

Keywords: Barometer Altimeter Altitude Elevation Pressure

Recent changes:
Please goto https://sites.google.com/site/msanders59/barometric-altimeter for user hints.

New features:

1. Added option to record data to the SD card.
2. Show the elevation and pressure values on the Plot Screen.
3. general UI enhancements and bug fixes.
4. Need two extra permissions for the new features. These are to write to external-storage-device, and wake-lock.

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User reviews of Barometric Altimeter
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Android Market Comments
A Google User
Jun 2, 2014
Good enough
A Google User
Feb 10, 2013
Hasn't got it right once in 2 weeks of testing After 2 weeks of trying this app, it has not got the height above sea level correct once.
A Google User
Feb 10, 2013
Hasn't got it right once in 2 weeks of testing After 2 weeks of trying this app, it has not got the height above sea level correct once.
A Google User
Dec 2, 2012
I removed this app - why? I have spent a couple of years of my life leading walking and skiing holidays.My comments are related to how I use a real barometer/altimeter Weather - in the absence of a forecast, changes in atmospheric pressure, tracked every hour or two over a day or so, give some useful idea of likely weather changes. In particular, steep drops in pressure over several hours give indicate a very high probability of much worse weather arriving. Navigation on land - altitude gives a third factor that can be used in addition to the two basics of direction and speed. Typical accuracies given are plus/minus 10m in 500m ascent or descent within a 3-hour period. Altimeters should be re-set to known altitudes at the start of every day's trip, and at everymajor point where altitude can be read from the map. The apps I have had on my Samsung Galaxy Note fail in two ways. They record meaningless & minute fluctuations second-by-second; yet they do not allow for hourly recordings of pressure over a period of (say) 24 or 48 hours (which would be extremely useful). Indications of altitude give similarly (false) accuracies overwhelmed bymeaningless fluctuations
A Google User
Aug 16, 2012
Good Good