I also understand that part of this process will involve the correction of
some distortions that have crept into the mapping over the years and have
been highlighted by differential GPS - some data can be as much as 20m out!
I have been told that there may be a way of adjusting data derived from this
mapping to the 'correct' locations, but know little about it.  Anyone any
wiser?

Peter Iles

-----Original Message-----
From: Hopper, Brian [mailto:[log in to unmask]]
Sent: 11 October 2001 13:58
To: [log in to unmask]
Subject: MastermapThe Digital National Framework and MasterMap


As things have gone a little quiet on the GIS front recently I have sent
through a contribution by Glen Hart from OS on current DNF/ MasterMap
developments. I think this fits in nicely and put some more context to the
earlier presentation by RCAHMS on the link between OS and Royal Commissions
/ English Heritage and their role in reengineering heritage data in the
DNF/MasterMap.

OS are promoting MasterMap as a standard national referencing system - a
basic metadata standard if you like and
would welcome comments to the list or directly.

I also have a powerpoint presentation on MasterMap I can make available if
you contact me directly.

Cheers

BRIAN

The Digital National Framework and OS MasterMap


"Ordnance Survey has been developing a new national referencing standard for
geography that extends beyond the boundaries of the National Grid and which
is designed to meet the future needs of E-business and digital information
exchange.

The Digital National Framework (DNF) is designed to provide a fundamental
referencing framework for geographical objects and comprises the National
Grid harmonised with GPS, OS Height Datum and unique feature identifiers
(TOpographic IDentifiers or TOIDs).

OS MasterMap is the brand name for Ordnance Survey's revolutionary new
large-scale product and on-line service, to be launched on 30 November 2001.
The first version of OS MasterMap provides polygon data and a unique
reference (TOID) for every feature on the British landscape. Incremental
add-ons to the product and service are planned for 2002 and beyond, with the
ultimate aim of producing all Ordnance Survey digital products from the OS
MasterMap database.

OS MasterMap allows data to extracted by themes.  These themes include
Buildings, Roads, Land, Water and there is also a Heritage theme.  In the
November launch not all the themes will be fully developed and this will
include the Heritage theme and new themes are likely to be added in future.
Ordnance Survey recognises the importance of working closely with others in
the future development of many of the themes and is therefore working
closely with the Royal Commissions in Scotland and Wales and with English
Heritage.

This work is proceeding along two lines: one to enable a fully Ordnance
Survey OS MasterMap Heritage theme to be developed and the other to provide
the potential for these heritage organisations to develop their own rich
heritage layer that sits above the basic OS MasterMap.   Such work will full
exploit the potential of OS MasterMap to provide a topographic frame work
upon which others can build more specific datasets through the use of the
National Grid and the real world features present in OS MasterMap that are
uniquely identified by the TOID.


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