Tag:man_made=survey_point

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Public-images-osm logo.svg man_made = survey_point
Trig Point near Wootton Wawen.jpg
Description
A triangulation pillar, geodetic vertex, or other piece of fixed equipment used by topographers.
Used on these elements
may be used on nodesshould not be used on waysshould not be used on areasuse on relations unspecified
Useful combination
Status: In use

A survey point is a triangulation pillar, geodetic vertex, or other piece of fixed equipment used by topographers. An example of these are DGPS radio stations. These points are normally in a fixed location and of a known altitude used for the old fashioned surveying.

See also Wikipedia-16px.png Triangulation station and Wikipedia-16px.png Benchmark (surveying).

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=* (mind the height reference system!).

Possible Rendering

Man made survey point.svg suggested by User:Chrisana13

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
  • In the UK tpuk_ref= can be used for the ID of a trig point on the trigpointinguk.com website.
  • Since multiple survey points are possible on one object (eg. a benchmark on a triangulation point/pillar) then in order to avoid multiple values within one key, such as a semicolon-delimited list in survey_point=*, it may be advisable to use something like triangulation_point=yes and benchmark=yes to allow clean coexistence of tags on one node.