| +/- man_made=survey_point
Triangulation pillars, geodetic vertices, and fixed equipment used by topographers (e.g. DGPS radio stations).
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
suggested by User:Chrisana13
- aerial=yes for extra markings meant to be visible in aerial photographs - a white cross, usually
- In the UK tpuk_ref= can be used for the ID of a trig point on the trigpointinguk.com website.
- type=triangulation, type=observation_spot, type=fixed_point and type=benchmark have meaning in nautical maps, where they refer to INT-1 codes B20, B21, B22 and B23 respectively.
Related terms: <survey point> <trig point> <triangulation point> <triangulation pillar> <trigonometrical station> <trigonometrical point> <trig station> <trig beacon>