RE: OGC Temporal DWG. Was: space and time

Hi Gannon (apologies if your name is not commutative)

Thanks for the precision in quoting references.

I think limited parts of the  Dershowitz and Reingold material is online, as individual papers scattered across various journals, and the Lisp code, but the books are better references. And the latest edition would be better - errata at http://emr.cs.iit.edu/home/reingold/calendar-book/third-edition/ .

And I agree that transparency about calendar algorithms is an issue, not just in their book. This is one thing that I hope that an OGC Best Practice document could help, in however a small way.

Best wishes, Chris 

-----Original Message-----
From: Gannon Dick [mailto:gannon_dick@yahoo.com] 
Sent: Thursday, July 24, 2014 5:24 PM
To: andrea.perego@jrc.ec.europa.eu; frans.knibbe@geodan.nl; Simon.Cox@csiro.au; Chris Beer; Little, Chris
Cc: public-locadd@w3.org; public-egov-ig@w3.org; public-lod; temporal@lists.opengeospatial.org; Piero Campalani; Matthias Müller
Subject: Re: OGC Temporal DWG. Was: space and time

Hi Chris,

who wrote:
One concern that I have is that we do not re-invent the  wheel, and do nugatory work, hence this email. I do not  envisage that we will need to do much with Calendars, which  have been covered so well by Dershowitz and Reingold.

=====================================
No question the quality of the issue coverage (Calendars) is first rate.

However, the computations are not transparently self-evident and the references you cite in the Wiki are not available on-line - or are they ?

3. Calendrical Tabulations 1900-2200, Edward M. Reingold, Nachum Dershowitz. Hardcover: 636 pages. Publisher: Cambridge University Press (16 Sep 2002) Language: English ISBN-10: 0521782538 ISBN-13: 978-0521782531

4. Calendrical Calculations, Nachum Dershowitz, Edward M. Reingold. Paperback: 512 pages. Publisher: Cambridge University Press; 3 edition (10 Dec 2007) Language: English ISBN-10: 0521702380 ISBN-13: 978-0521702386 

Accessability to "Wheels known to have been invented" is a Wiki issue, I think.

--Gannon




--------------------------------------------
On Thu, 7/24/14, Little, Chris <chris.little@metoffice.gov.uk> wrote:

 Subject: OGC Temporal DWG. Was: space and time
 To: "Gannon Dick" <gannon_dick@yahoo.com>, "andrea.perego@jrc.ec.europa.eu" <andrea.perego@jrc.ec.europa.eu>, "frans.knibbe@geodan.nl" <frans.knibbe@geodan.nl>, "Simon.Cox@csiro.au" <Simon.Cox@csiro.au>, "Chris Beer" <chris@codex.net.au>
 Cc: "public-locadd@w3.org" <public-locadd@w3.org>, "public-egov-ig@w3.org" <public-egov-ig@w3.org>, "public-lod" <public-lod@w3.org>, "temporal@lists.opengeospatial.org" <temporal@lists.opengeospatial.org>, "Piero Campalani" <cmppri@unife.it>, "Matthias Müller" <matthias_mueller@tu-dresden.de>
 Date: Thursday, July 24, 2014, 9:36 AM
 
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 Dear Colleagues,
  
 OGC started a Temporal Domain Working Group last year  to address a number of problems in the geospatial domain. In  particular, that time is usually just viewed as Yet Another  Attribute of Features, rather than a first class  coordinate.
  
 We agreed earlier this year, in Geneva, that the OGC  Naming Authority would have a branch to register Temporal,  and index based, Coordinate Reference Systems, and we agreed  on the fundamental attributes that a CRS should have to be  registered. 
  
 We hope to produce a Best Practice document this year  to help clarify many confusions between CRSs, notations,  calendars, operations and calculations. I think that now we  have a good enough understanding of the underlying  conceptual issues and current  geospatial standards.
  
 We have been accumulating info on an open wiki http://external.opengeospatial.org/twiki_public/TemporalDWG/WebHome

 and discussing via our
 mailing list, though we are not very disciplined about  it.
  
 One concern that I have is that we do not re-invent the  wheel, and do nugatory work, hence this email. I do not  envisage that we will need to do much with Calendars, which  have been covered so well by Dershowitz and Reingold.
  
 Best wishes, Chris
  
  
 Chris Little
 
 
 Co-Chair, OGC Meteorology & Oceanography Domain Working  Group  Co-Chair, OGC Temporal Domain  Working Group
 
 
 
 IT Fellow -
 Operational Infrastructures
 
 
 Met Office  FitzRoy Road  Exeter  Devon  EX1 3PB  United Kingdom
 
 
 Tel: +44(0)1392 886278  Fax: +44(0)1392 885681  Mobile:
 +44(0)7753 880514
 
 
 E-mail: chris.little@metoffice.gov.uk  http://www.metoffice.gov.uk

  
 I am normally at work Tuesday,
 Wednesday and Thursday each week

Received on Thursday, 31 July 2014 07:26:39 UTC