Just to clarify Gails's description:
OS Parcel numbers are expressed "OS Km Sheet number - 10m EastEast 10m NorthNorth"
I understand that IACS numbers are expressed "100m EastNorth 10m EastNorth". It's easier to identify the hectare number.
Parcel numbers should be for the centre of a field. Changes in boundaries will therefore change centres and centre references.
The OS once told me that there is no "legal" status to parcel numbers, and you can create them yourself as long as the convention of centred reference is used. So if the vector mapping doesn't have a parcel number you can identify one yourself to use.
>>> [log in to unmask] 22/02/2002 09:15:01 >>>
Does anyone know whether OS parcel numbers are fixed in stone or do they
change over time? I am writing an SMR manual and I need to know whether/how
to record them and how to treat the records we already have.
Tim Grubb - SMR Officer
Gloucestershire County Council Archaeology Service
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