alankwok / androzic

Automatically exported from code.google.com/p/androzic
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Display MSL altitude #58

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago
What steps will reproduce the problem?
1. Compare altitude known from the map and altitude displayed on Androzic

What is the expected output? What do you see instead?
Usualy Androzic is 50-60 meters more than real.

What version of the product are you using? On what operating system?
Android 2.1 Androzic 0.9.8b

Please provide any additional information below.
May be a problem with elipsoid used to compute altitude.
I live at roughly 45°N/6°E
On the same smartphone, more realistic altitude is given by "GPS status" (from 
the Market)

Thanks.

Original issue reported on code.google.com by jean.3...@gmail.com on 6 Jan 2011 at 10:11

GoogleCodeExporter commented 8 years ago
Androzic shows altitude "as is" that is provided by GPS receiver. GPS status 
application shows the same altitude (with respect to its +15 meters, which I do 
not understand).

Original comment by andrey.g...@gmail.com on 9 Jan 2011 at 10:55

GoogleCodeExporter commented 8 years ago
Sorry, I didn't notice the +49m (for me) of GPS status. 

I guess that GPS receiver gives an altitude related to a theoretetical sphere. 

Since earth is an ellipsoid (flattened on the poles), the +15m or +49m seems to 
be the difference between sphere and ellipsoid at a given latitude.

Since I use androzic for hicking in montains, altitude accuracy is a concern. I 
have now the way to get it.
Thanks.

Original comment by jean.3...@gmail.com on 10 Jan 2011 at 4:32

GoogleCodeExporter commented 8 years ago
Thanks for that notice. I will look at details of GPS altitude and convert this 
issue to feature request. This behavior sounds reasonable if you are right.

Original comment by novikov on 10 Jan 2011 at 10:02

GoogleCodeExporter commented 8 years ago

Original comment by novikov on 11 Jan 2012 at 10:03

GoogleCodeExporter commented 8 years ago
Issue 196 has been merged into this issue.

Original comment by novikov on 11 Jan 2012 at 10:03

GoogleCodeExporter commented 8 years ago

Original comment by novikov on 15 Jan 2012 at 6:43

GoogleCodeExporter commented 8 years ago
GPS Receivers give 2 standartized vaues of altitude:
1. Altitude above/below mean-sea-level (geoid)
2. Geoidal separation, the difference between the WGS-84 ellipsoid and geoid.

Different programs may differently interpret values of altitude (as altitude 
above ellipsoid or geoid).

Original comment by uazi...@gmail.com on 19 Jan 2012 at 8:16

GoogleCodeExporter commented 8 years ago
Implemented in 1.3

Original comment by novikov on 30 Jan 2012 at 9:33

GoogleCodeExporter commented 8 years ago
Hello.
You say it is implemented in the 1.3.1 version, but I am using the 1.4.1 
version and I have always about +45 meters of error (I'm living in France). I 
dont't find in the menus how to activate the correction (if any). May you help 
me please ?

Original comment by grall29...@gmail.com on 17 Mar 2012 at 3:02

GoogleCodeExporter commented 8 years ago
I live in Italy and I notice +105 meters of error, other useless apps detect 
correct altitude.
May you help me please ?

Original comment by fguide...@gmail.com on 28 May 2012 at 11:20

GoogleCodeExporter commented 8 years ago
This depends on the smartphone used. On my previous SEx8mini the error was not 
the same as with my actual. Samsung ace.

Original comment by jean.3...@gmail.com on 28 May 2012 at 12:36

GoogleCodeExporter commented 8 years ago
i've the same problem on Galaxy S3

Original comment by hugues.d...@gmail.com on 26 Jun 2012 at 3:26