I am forwarding comments from Nick Knowles on the proposals emerging
from the workshop at his request.
His comments do confirm that there is a high degree of conformance
with the CEN standard already which is encouraging.
He does make some suggestions for greater conformance because this
could both help both unlock official data and indeed encourage the
professional community to engage with OSM in order to collect some of
this data!
I hope to be in a position to forward links to a couple of large
attachments that he sent with the original email in due course.
Regard,
Peter
Begin forwarded message:
From: Nick Knowles <nick_know...@kizoom.com>
Date: 28 May 2009 20:50:24 BST
To: Peter Miller <peter.mil...@itoworld.com>, "Roger Slevin (DfT)" <d...@slevin.plus.com
>
Cc: Frederik Ramm <frede...@remote.org>
Subject: RE: An emerging tagging proposal for public transport
within OSM from Germany
Hi Peter
Thanks very much for forwarding this - interesting to see the
network tagging they are using given that the NeTEX work is underway.
I would strongly encourage the OSM groups to try and align the
Stop tagging model with the CEN IFOPT model of Stop Places, which
is the CEN technical standard model based on analysis of stop models
from a number of different European countries. If they do this it
should be much easier top relate stop tags to public transport
information systems like departure boards and journey planners. The
German VDV organisation has participated fully in IFOPT and would
be a good point of contact for Geofabrik and others
I have attached the IFOPT specification and a short presentation on
the stop place model, also a Jpg of the basic IFOPT model.
I did a very quick comparison just out of interest
1. IFOPT Oxomoa equivalences
It looks to me that the oxomoa model is actually already close
to the IFOPT model in that they both correctly separate the
representation of stops into two levels - the actual physical access
point and the stop group/station, and contain the same concepts.
If one compares the two one can see the correspondance, and also
that IFOPT makes a couple of further distinctions that facility
relating the elements to public transport information services.
1.1 Oxomoa: Stop Area <--> Ifopt: STOP PLACE : (i.e. a collection
of closely related Stop Positions/QUAYs that have a common name
such as a Station , pair of bus stops, or airport)
1.2 Oxomoa: Access (public_transport =platform) <--> Ifopt:QUAY
(i.e. the actual labelled physical point of access to the transport,
which will typically be a pole for a bus , a platform for trains/
metro, a quay for a boat, or a gate for an airport. A QUAY may
have one or more BOARDING POSITIONs.
1.3 Oxomoa: Access (public_transport =Entrance) <--> Ifopt:STOP
PLACE ENTRANCE (i.e. an entrance to a QUAY, STOP PLACE, or ACCESS
AREA)
1.4 Oxomoa: Stop Position (public_transport =stopposition) <-->
Ifopt:BOARDING POSITION - A physical point on a QUAY - may be
labelled subdivision of a Quay/Platform.
1.5 Oxomoa: Stop Area Group = Ifopt: a STOP PLACE that has
children, (Because big interchanges such as train stations and
airports may have many levels, rather than being limited to just
one level of grouping , IFOPT allows a nested STOP PLACE . For
example St Pancreas, St Pancreas International, St Pancreas
International departures, St Pancreas Domestic, St Pancreas
underground, etc )
2. Differences
2.1 IFOPT also has an ACCESS SPACE - i.e. a concourse, hall or
corridor that is part of a STOP PLACE such as a station, but that
is not a named platform/ QUAY i.e. point of access to the transport
2.2 IFOPT uses a separate entity & relationships for concept of
QUAY, and ENTRANCE, rather than lumping these together.
2.3 IFOPT STOP PLACEs and QUAYs are also recursive.
2.4 IFOPT LEVEL allows the logical level - e.g. first floor,
underground level 1, level 2 etc to be indicated.
Question: In IFOPT the fundamental entity is QUAY - one always has
one of these for each stop - it may be part of a STOP PLACE and be
accompanied by one or more BOARDING POSITIONs. The Quay has a
Label i.e. stop name etc assigned by the Public Transport Operator
or Authority. One would not have a BOARDING POSITION without a
Quay. It looks as if Oxomoa, just for buses but not for rail,
conflating QUAY with BOARDING POSITION - how would one handle bus
stops with multiple boarding positions ?
- Nick
Nick Knowles, CTO Kizoom
Mailto: nick_know...@kizoom.com
GSM: +44(0)7867 801010
Kizoom 109 - 123 Clifton Street, London, EC2A 4LD,
Telephones: sb 020 77492670. direct 02077492676
WEB: http://www.kizoom.com
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