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Re: [gpsd-dev] RFC: GPSd on Android as a system service

From: Gary E. Miller
Subject: Re: [gpsd-dev] RFC: GPSd on Android as a system service
Date: Mon, 6 May 2019 16:12:40 -0700

Yo A.S.!

On Mon, 6 May 2019 19:01:19 -0400
"A.S." <address@hidden> wrote:

> >  
> > > It means exactly what the documentation says it means... that the
> > > elevation is unknown, which is what you expect AFTER the signal
> > > has been picked up, but BEFORE it has been able to calculate it.  
> >
> > a) No documentataion confirms that.
> >  
> Yes it does, and very specifically. It says that the valid range is
> +/-90, and "unknown if out of range".
> -91 is outside of the range [-90, 90], thus -91 is "out of range",
> meaning that the elevation is UNKNOWN.

Agreed, and gpsd does not pass on UNKNOWN data.  It is useless because
it is UNKNOWN.  Now if we knew what it meant, but we do not.

> > b) makes no sense to know the Azimuth and not Elevation.
> >  
> Right, so if the elevation OR azimuth is out of range, then they BOTH
> should be considered UNKNOWN.

Good.  This is what the code does now.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin

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