Talk:Tag:man made=survey point

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Different types of survey points

How to make a difference between different types of survey points? International nautical maps use 4 different symbols depending if the survey point is a triangulation point, observation point, fixed point, or a benchmark. (see INT 1 B20 - B23) --Skippern 09:03, 3 May 2011 (BST)

I see you added these to the page as type=*. That is recommended to be avoided (see Key:type) as it can be confusing or difficult to understand. For this case, it would be better to use either survey_point=* or survey_point:type=* --Neuhausr (talk) 12:57, 8 July 2015 (UTC)

Some hunting cabins have been mapped as observation points. I suppose this is incorrect  ? What is an observation point ?

trig station vs survey mark

The wiki page for man_made=survey_point describes it for trig stations, but how can we map survey points which are just a small circular disk cemented into the ground? Aharvey (talk) 01:52, 16 November 2017 (UTC)

The wiki page states 'benchmarks' too, these are not trig stations. It would be useful to distinguish between the two. The key height could give some idea of the situation, height=0 for surface marks? survey_point=benchmark/triangulation_station, benchmark:material=brass or survey_point:material=brass ??? Warin61 (talk) 23:54, 19 November 2017 (UTC)
The definition is "survey point is a triangulation pillar, geodetic vertex, or other piece of fixed equipment" so that includes all survey marks. If you look back through the history of this page various people have tried adding sub classes only to have their work removed. Seamarks does have a tag to indicate the sub class Seamarks/Categories_of_Objects#Control Points (CATCTR) Adavidson (talk) 08:57, 20 November 2017 (UTC)
I find encouragement that others have felt the need for sub tags. Perhaps survey_point:category=benchmark/triangulation/* with good definitions would gain use/approval? Triangulation would be something visible at distance (over 1 km), benchmark would be close to surface level. Warin61 (talk) 21:52, 20 November 2017 (UTC)