Subject: RE: [Ecrit] Comment on ecrit-requirements-00 item L10

From: "Roger Marshall" <[email-masked]>
Date: Thu, 13 Oct 2005 14:16:45 -0700

Martin:
I think your point is valid.  I take this as the mapping server.  I've
also changed the requirement to reflect this.

New proposed text for L10:

Reference Datum: The mapping server MUST understand WGS-84 
coordinate reference system and may understand other reference 
systems.

Thanks.

Roger Marshall

>-----Original Message-----
>From: Thomson, Martin [mailto:[email-masked]] 
>Sent: Thursday, September 29, 2005 3:19 PM
>To: Roger Marshall
>Cc: ECRIT
>Subject: RE: [Ecrit] Comment on ecrit-requirements-00 item L10
>
>You need to identify what you mean by "The server", the 
>context doesn't make that clear.  Are we talking about an LCMS 
>server?  If so, use "LCMS servers MUST...".
>
>-----Original Message-----
>From: [email-masked] [mailto:[email-masked]] 
>On Behalf Of Roger Marshall
>Sent: Friday, 30 September 2005 3:35 AM
>To: Clive D.W. Feather; Tim Dunn
>Cc: ECRIT
>Subject: RE: [Ecrit] Comment on ecrit-requirements-00 item L10
>
>Clive:
>
>With the idea of keeping the requirements more general (not 
>saying your system can't impose more detailed requirements on 
>top), I believe that the following single requirement proposed 
>by Henning is sufficient:
>
>L10.  Reference Datum: "The server MUST understand WGS-84 
>coordinate reference system and MAY understand other reference 
>systems."
>
>Roger Marshall
>
>
>>-----Original Message-----
>>From: [email-masked] [mailto:[email-masked]] 
>On Behalf 
>>Of Clive D.W. Feather
>>Sent: Thursday, September 29, 2005 2:17 AM
>>To: Tim Dunn
>>Cc: 'ECRIT'
>>Subject: Re: [Ecrit] Comment on ecrit-requirements-00 item L10
>>
>>Tim Dunn said:
>>> How about an alternate presentation of the requirement, 
>specifically:
>>[...]
>>
>>Having read the discussion over the last couple of days, what I think 
>>is needed is:
>>
>>A:  There MUST be a way in the protocol for the caller's equipment to
>>    negotiate a choice of coordinate system with the PSAP.
>>Aa: Calling equipment MUST be able to convert its location to any of 
>>the
>>    coordinate systems it offers in the negotiation.
>>Ab: PSAP equipment MUST be able to convert the received location from 
>>any
>>    of the coordinate systems it offers in the negotiation to that
>>    required internally.
>>B:  Both calling equipment and PSAP MUST offer WGS-84 as part of the
>>    negotiation (even if not the first choice). [This could be 
>>implemented
>>    either by requiring it to be on any lists, or by making it the 
>>fallback
>>    if negotiation fails.]
>>
>>Then, if the negotiation is the common one of "offer an ordered list, 
>>use the first one on both side's lists":
>>
>>    UK CPE offers:         OSGB, WGS-84
>>    other CPE offers:      XXX, YYY, WGS-84
>>    UK PSAP accepts:       OSGB, WGS-84
>>    other PSAP accepts:    ZZZ, WGS-84
>>
>>(where XXX, YYY, ZZZ are other systems) and all works.
>>
>>-- 
>>Clive D.W. Feather  | Work:  <[email-masked]>   | Tel:    +44 
>>20 8495 6138
>>Internet Expert     | Home:  <[email-masked]>  | Fax:    +44 
>>870 051 9937
>>Demon Internet      | WWW: http://www.davros.org | Mobile: +44 
>>7973 377646
>>Thus plc            |                            |
>>
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