Re: [Geopriv] New indoor location - standards needed

Alexandru Petrescu <alexandru.petrescu@gmail.com> Wed, 26 November 2014 09:01 UTC

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Date: Wed, 26 Nov 2014 10:00:39 +0100
From: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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Subject: Re: [Geopriv] New indoor location - standards needed
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Le 25/11/2014 19:51, Rosen, Brian a écrit :
[...]
> I think working on the barometric pressure thing would be
> fascinating, and I think we’re probably at least as qualified to do
> the work as anyone else.  Perhaps we could get the OGC to work on in
> with us.  I think of that as combining the existing elevation
> datasets with building floor height data to produce a floor number
> from the barometric data.  I’d guess some compensation from weather
> data would be needed.

Certainly yes - compensation from weather data is needed, as a fixed 
reference pressure level at a given point does not exist - it varies 
with weather.

On another hand, with 'sealed' buildings the pressure is independent 
from weather _and_ altitude (pretty much as the pressure in a flying 
airplane says on-ground).  A connection to the HVAC should be made.

Af447 experience taught one should worry when pressure sensors are 
flawed by freeze.

Alex

>  Crowdsourcing might be interesting, but what
> would we use to actually get the right data (how does the source
> know/enter floor data?)  Hah - sound analysis on an elevator ride!
> Listen for the dings and floor announcements.  Watching steps and
> pressure is probably a decent way to figure out what floor you are on
> if you walk up a stairway.
>
> Brian
>
>
>> On Nov 25, 2014, at 12:32 PM, Henning Schulzrinne
>> <Henning.Schulzrinne@fcc.gov>; wrote:
>>
>> See
>>
>> http://apps.fcc.gov/ecfs/document/view?id=60000986637
>>
>> In particular, the need for standards is called out in two areas:
>>
>> - for the National Emergency Address Database (NEAD)
>>
>> - for delivery of barometric pressure information to obtain z-axis
>> (altitude) information.
>>
>> The FCC is not a party to the agreement. It seems at least
>> plausible that existing GEOPRIV work, such as HELD, or RFC 7105,
>> can be extended to meet those needs. I'd appreciate hearing
>> opinions on technical options from the WG.
>>
>> Henning
>>
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