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Hi Ian
This exact subject was discussed at the MapInfo
User Group for UK and Ireland in Bristol recently.
I've written a small paper about it and
it can be downloaded from either our website at:
I personally would recommend using a Bounds clause
of (0,0) (2000000,2000000) which will give you a "step size" of exactly 1
millimetre and hold the Ordnance Survey values in MasterMap ITN,Address and Topo
layers exactly. The values you use will have rounding errors up to about 6
millimetres.
Regards
----- Original Message -----
Sent: Tuesday, April 11, 2006 4:57
PM
Subject: [MI-L] British National Grid
Projection
Hi all,
I'm currently using
the following to setup my British National Grid projection - I'm not
sure where the bounds clause came from and changing it makes slight
differences to the output. I was just wondering what other UK users use as
their projection and whether there is a "standard" in use.
set CoordSys Earth Projection 8,
79, "m", -2, 49, 0.9996012717, 400000, -100000 Bounds (-7845061.1011,
-15524202.1641) (8645061.1011, 4470074.53373)
Regards,
Ian Hull
Systems Team
Leader
Greater Manchester Transportation Unit
Salisbury House
Granby
Row
Manchester
M1 7AH
Internal Tel: 815 2059
Tel:
0161 455 2059
Fax: 0161 455
2071
E-mail: [EMAIL PROTECTED]
Website:
http://www.agma.gov.uk/Units/TransportUnit.htm
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