RE: OGC Temporal DWG. Was: space and time

On Tue, 7/29/14, Little, Chris <chris.little@metoffice.gov.uk> wrote:
 
 And I agree that transparency about calendar algorithms is an issue, not just
 in their book. This isone thing that I hope that an OGC Best Practice document could help, in however a small way.
 
 ============

Hi Chris,

Maybe it is time to "go big" - Universal Coordinated Calendar Time (UTCT).  In the near term, (this Julian Century) the Calendar has no unidentified shifts.  We know about Leap Days and the Calendar is ignorant of Leap Seconds.  So, it is possible.  

This presents a problem for Linked Data because even though Personal Identity is coupled to Occupation and Occupation is coupled to the Location of the Workplace, these are couplings not correlations.

Mid-day, Noon, is a mean value, but one can't assume regression to the mean. At the Equator the "Authority" - Solar Noon - has a whopping 7 1/2 minute time shift.  This is not hidden, but it is overwhelmed by the Equation of Time.  The shifts, on a day-to-day basis do not accumulate to significance on a year-to-year basis. To determine coupling constants is a fools errand.

e.g. http://www.rustprivacy.org/2014/balance/utct.jpg

When people triangulate in their heads they use 3,4,5 triangles to keep the math easy.  For this reason, the Axis length is 500%.  All "shifts" (events which impact Work Life Balance) are vertical. Sorry, the "Day" indicator can't update automatically - it's a PDF.

WDYT?

Best,

--Gannon (J.) Dick ;-) I'm not a commuter, I have a funny name.


 
 -----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
  
  #yiv4303497829
  #yiv4303497829 -- .yiv4303497829EmailQuote
 
 {margin-left:1pt;padding-left:4pt;border-left:#800000 2px
  solid;}#yiv4303497829 
  
  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 Tuesday, 29 July 2014 17:45:48 UTC