One bit of feedback, from a first try at doing this for real: footpaths
often cross parish boundaries, and at least in this area change their
reference when they do so. But your slippy map only displays geometry
for a single parish at a time, meaning that tracking the prow_ref value
for the full length of a single path can take a lot of navigation within
your tool.
Would it be hard to display geometry for all ROWs overlapping the
current slippy map extent, whichever parish they are from?
--
Cheers,
John
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