[Tagging] Additional sub tags for survey mark
phil at trigpoint.me.uk
Thu Nov 23 15:06:37 UTC 2017
On 23 November 2017 14:37:53 GMT+00:00, Craig Wallace <craigw84+osm at gmail.com> wrote:
>On 2017-11-20 23:47, Warin wrote:
>> There have been attempts in the past to add sub tags to
>> To me there are 2 'types'. they are quite different;
>> Triangulation (or 'trig point') that are visible over quite some
>distance (say over 2 km),
>> used to triangulate a position without having to go to the mark.
>Usually a pole standing on top of a rise/hill.
>> Benchmarks that are visible on the surface but cannot be sighted at
>any distance. They can be small brass plaques fastened to the ground or
>engraved into stone.
>> These are used by surveyors by placing a tripod over the mark, thus
>have to be locally approached.
>> If consideration is given to
>> then expanding survey_point in a similar manner could be
>> I use 'configuration' rather then 'type' or 'category' as it is more
>specific as to what is meant.
>> Any thoughts?
>> Are there any other configurations?
>It would be useful to tag the physical style of the survey point. ie
>size and shape and what it is made of. Is it a pillar, or just a metal
>plate or bolt on the ground. This would tell you whether it is an
>obvious landmark or not.
>Tagging what the survey point is used for is a separate thing. ie
>triangulation, or a benchmark. Nowadays most trig points are redundant,
>so they are not actually used for any sort of survey work. Though in
>UK there are some still maintained as "passive stations", plus a few
>"active stations" (with a GPS receiver).
>Note there are some "Fundamental Benchmarks", which are a small stone
>Some of the common types in the UK: http://trigpointing.uk/wiki/Types
Trig points are an important feature in UK outdoor circles, particularly in mountain and moorland areas. They are places you head to and obviously give a precise reference as to where you are.
Some have been adopted by groups who maintain them for future generations.
They also provide a good place to sit and watch the world below, my OSM username is no accident.
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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