On 23/06/2025 13:25, Colin Smale wrote:
Where the boundary actually is, can be a subjective judgement. For some purposes, "down the middle of the road" is good enough, but not always. For parish councils that might be fine, but for a highways authority it needs to be more specific: who resurfaces the road? Who is responsible for the white lines? In the highest-resolution OS mapping I have seen it is possible to see how the line sometimes follows the kerb, sometimes the property boundary, etc.
You probably already know this, but some OS Maps have text labels on administrative boundaries - "CR" for "centreline of river", "BR" for "bank of river", "CH" for "centreline of hedge", "FH" for "face of hedge", etc.; and sometimes "def" for "defaced" when the boundary was defined by a physical feature that's no longer present (usually a hedge that's been grubbed up). I suspect in a lot of cases (especially segments of boundary that haven't been changed for some time), these physical feature references rather than the numerical-spatial location are the definition of the boundary that's in the legislation. Unfortunately, map products that have those labels seem to have been becoming steadily harder to get hold of for some time.
(I wonder if we could invent some tags to put on administrative boundary features in OSM that provide the same sort of information.)
--
Kind regards,
Dan Hatton
Dr. Daniel C. Hatton
E-mail: [email protected]
Signal: dch.28
SIP: [email protected]
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