Either a datum mix-up or different roundings used in the constants for
the back-and-forth conversion. Either way that's not a real trace
On 14/12/2020 19:33, Colin Smale wrote:
On 2020-12-14 20:21, Edward Bainton wrote:
With plenty of portages...
Glad I'm not going mad. Does it say anything useful or interesting
that the "GPS trace" is a few metres away from the boundary as marked
on the map? (Sorry if this has been answered recently: there was
extensive discussion on alignment not long ago, but too technical for
me to follow easily.)
If my suspicion is correct that a converted version of the OS
Boundary-Line data was uploaded as GPX, then the small shift just
indicates that the exact parameters used to convert from the OS
coordinate system (Eastings and Northings) to the system used by GPS
and OSM were different.
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