Tag:man_made=survey_point

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+/- man_made=survey_point Description Triangulation pillars, geodetic vertices, and fixed equipment used by topographers (e.g. DGPS radio stations). Used on these elements Useful combination name ref Status Undefined Tools for this tag Combinations worldwide in Australia/Oceania in Europe (list) in Asia (list) in Central America (list) in South America (list) in Africa (list)  (via overpass turbo - help)

These points are normally in a fixed location and of a known altitude used for the old fashioned trigonometry and cartography.

See also wikipedia:Triangulation station

How to map

Add a node at the location of the trig point and use the man_made=survey_point. You can also add a name using name=*, its bracket number with ref=*, and its elevation using ele=*.

In the UK tpuk_ref= can be used for its ID on the trigpointinguk.com website.

example bracket on a UK trig point, tag with ref=S8325

Additional tags

• aerial=yes for extra markings meant to be visible in aerial photographs - a white cross, usually

Related terms: <survey point>