I have been looking at what is recorded under this tag in my area. I see
that there aren't that many and those that are on OSM refer to trig
points (see also http://trigpointing.uk/). My thinking is that if these
are accurate and precisely marked on OSM then perhaps they could be used
for resolving issue such as aerial imagery offsets.
I therefore wondered if it was worth using other data under this tag -
specifically benchmarks (https://www.ordnancesurvey.co.uk/benchmarks/)
as there are huge numbers in the UK. If these were marked on OSM and
their accuracy and precision verified (OS open data is to the nearest
10m square and transforming that adds errors), they could be helpful in
local surveys where they are less than accurate but also for ensuring
that moving all nodes in an area is valid (not just to match aerial
imagery). A possible linked organisation with data is
https://www.bench-marks.org.uk/
Incidentally, the benchmarks can be helpful if you need to align
historical maps which have benchmarks shown.
Any thoughts?
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