OJ W wrote: > start_date=, end_date= > > http://wiki.openstreetmap.org/wiki/Map_Features#Properties > > http://osmdoc.com/en/tag/start_date/ > > http://osmdoc.com/en/tag/end_date/ > > maybe someone could create the tag pages for those on wiki? > > 2009/5/22 Peter Dörrie <peter.doer...@googlemail.com>: >> Hi everybody, >> >> I made a proposal for tagging "the 4th dimension". Hope you like it ;) >> >> http://wiki.openstreetmap.org/wiki/Proposed_features/4th_Dimension
There are a couple of things here that need discussing, but hopefully that can be a quick discussion. MANY of the features on the map can be identified with a 'start_date' and it would be nice to have that information. Lots of new roads are being built, and many historic locations have a construction date. The problem comes with 'end_date', and since in some areas roads ARE being destroyed, are they removed from the map or CAN they be left with an end_date and features which have an end_date earlier than the current date are ignored? ( I'm thinking of the 2012 Olympic site which has re-routed many roads? ) The actual content of a date is a major point of discussion, but for the time being I would propose sticking with a simple ISO date format. The discussion on historic date formats has been going on for years now on the genealogical lists without agreement. Just consider where a start_date is between two known dates. i.e. a feature is absent on a map of 1945 but present in the 1955 map - so you end up with a more complex start_date entry ... and which calendar was used to provide the date ;) ( start_date and end_date were I think added for things like festivals and other transitory map information, so it may be appropriate to redefine them as constructed_date and demolished_date to distinguish historic data from transitory data ? ) -- Lester Caine - G8HFL ----------------------------- Contact - http://lsces.co.uk/wiki/?page=contact L.S.Caine Electronic Services - http://lsces.co.uk EnquirySolve - http://enquirysolve.com/ Model Engineers Digital Workshop - http://medw.co.uk// Firebird - http://www.firebirdsql.org/index.php _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
