{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.survey-marker","code":"thing-q352956","url":"https://ver.cy/models/thing/q352956/","name":"survey marker","alternateNames":["geodetic station","ground control point","geodetic ground net point"],"kind":"thing","status":"published","version":"0.2.0-wave.3","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.BLT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A durable physical mark set in the ground or on a structure whose position has been precisely measured, used as a reference point for surveying, mapping, boundary definition and geodesy, such as benchmarks giving elevation, triangulation stations, geodetic network points and ground control points for aerial and satellite imagery; markers are typically brass or aluminium discs, pillars or bolts, recorded in official registers with coordinates.","purpose":"Let an agent explain what survey markers are and how they are used, identify kinds and their registers, relay legal protection and reporting information, and distinguish survey markers from boundary stones and navigation aids.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Measured position","Official register","Legal protection","Network membership"],"structure":{"bundles":[{"id":"identify","name":"Identify","description":"What marker this is.","layers":[{"id":"kind","name":"Kind","description":"Kind and function.","findings":[{"id":"kind-finding","name":"Kind","description":"Kind.","questions":[{"text":"What kind of survey marker is it, and what does it reference?","kind":"definition"},{"text":"Is the object a survey marker, a boundary stone or another marker?","kind":"boundary"}]}]},{"id":"register","name":"Register","description":"Registers and data.","findings":[{"id":"register-finding","name":"Register","description":"Register.","questions":[{"text":"Where are marker positions recorded, and how are they retrieved?","kind":"provenance"},{"text":"Which entry fits the specific survey authority?","kind":"action"}]}]}]},{"id":"use","name":"Use","description":"Use in surveying.","layers":[{"id":"surveying","name":"Surveying","description":"Surveying.","findings":[{"id":"surveying-finding","name":"Surveying","description":"Surveying.","questions":[{"text":"How are markers used to control surveys, mapping and construction?","kind":"provenance"},{"text":"Which entry fits geodetic control?","kind":"action"}]}]},{"id":"modern","name":"Modern","description":"GNSS and modern networks.","findings":[{"id":"modern-finding","name":"Modern","description":"Modern.","questions":[{"text":"How have GNSS and continuously operating stations changed the role of physical markers?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]}]},{"id":"protect","name":"Protect","description":"Protection and reporting.","layers":[{"id":"law","name":"Law","description":"Legal protection.","findings":[{"id":"law-finding","name":"Law","description":"Law.","questions":[{"text":"What laws protect markers, and how are damaged markers reported?","kind":"provenance"},{"text":"Is the question about a specific marker, which needs the survey authority?","kind":"boundary"}]}]},{"id":"datum","name":"Datum","description":"Datums.","findings":[{"id":"datum-finding","name":"Datum","description":"Datum.","questions":[{"text":"How do datum changes affect marker coordinates?","kind":"provenance"},{"text":"Which entry fits geodetic datum?","kind":"action"}]}]}]},{"id":"context","name":"Context","description":"History and heritage.","layers":[{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"How did national surveys establish marker networks, such as triangulation of Britain and India?","kind":"provenance"},{"text":"Which entry fits the history of geodesy?","kind":"action"}]}]},{"id":"heritage","name":"Heritage","description":"Heritage and hobby.","findings":[{"id":"heritage-finding","name":"Heritage","description":"Heritage.","questions":[{"text":"How are historic markers preserved, and how do enthusiasts record them?","kind":"provenance"},{"text":"Which sources are cited?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Record a survey marker's position, datum and condition in the survey record.","Report disturbed, damaged or missing markers to the mapping authority.","Convert marker coordinates between datums, stating the transformation."],"mustNot":["Move, remove or damage a survey marker.","Use old coordinates without stating the datum.","Treat a survey marker as a boundary marker or the reverse without evidence.","Rely on a disturbed marker for boundary or engineering work."],"requiresHuman":["Resetting or replacing a marker.","Using markers to settle a boundary dispute."]},"ethics":{"considerations":["Markers underpin property boundaries and engineering; damage causes costly errors.","Boundary errors can lead to disputes between neighbours."],"affectedParties":["Landowners","Surveyors","Engineers"]},"owners":{"steward":"The national mapping or survey authority that set it; the landowner hosts it.","roles":[],"masterSystems":["National geodetic control registers"]},"relations":[{"target":"Q13580385","type":"parent","note":"registry parent class"},{"target":"geographical marker","type":"related","note":"in registry terms"},{"target":"geodesy","type":"related","note":"and surveying"},{"target":"geodetic register","type":"related","note":"with coordinates"},{"target":"boundary marker","type":"related","note":"which marks property limits"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.survey-marker","Wikidata: Q352956 (https://www.wikidata.org/wiki/Q352956)","station designation: per survey authority stamped on the marker"]},"properties":{"applicability":"required","items":["Maximum horizontal dimension:  millimetre - Measure the widest horizontal extent of the marker and distinguish the visible mark from its supporting monument.","Exposed height:  millimetre - Measure the vertical projection above the surrounding ground or mounting surface.","Embedment depth:  metre - Establish the depth below the mounting surface from installation records or an authorized assessment that preserves the marker."]},"recognition":{"applicability":"required","items":["Precisely measured reference point","Discs, pillars, bolts and stations","Boundary stones mark property limits; milestones mark distance; navigation aids guide travel","A metal disc, bolt or pillar set in rock, concrete or a building, stamped with an identifier and often a warning against disturbance."]},"capabilities":{"applicability":"required","items":["explain kinds and functions","relay registers and coordinates sources","relay legal protection","distinguish from related markers"]},"hazards":{"applicability":"required","items":["Disturbance or destruction","Datum changes making old coordinates inconsistent","Confusion with other markers"]},"interfaces":{"applicability":"required","items":["National geodetic survey standards","Laws protecting survey markers from disturbance","Datum and coordinate reference system definitions"]},"context":{"applicability":"required","items":["Providing precise reference positions for surveying and mapping.","benchmarks for elevation","triangulation pillars and stations","geodetic network points","ground control points for imagery","continuously operating GNSS stations as modern counterparts","historical markers of national surveys"]}},"sources":[{"title":"Wikidata item Q352956: survey marker","url":"https://www.wikidata.org/wiki/Q352956","note":"identity and sense of the item"},{"title":"Wikipedia: Survey marker","url":"https://en.wikipedia.org/wiki/Survey_marker","note":"general description of the item"}],"openQuestions":["Should benchmark and triangulation station be separate entries?","How should national registers be linked?","How should datum history be recorded?"],"resources":{"spec":"/models/things/publications/thing-q352956/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q352956/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T22:52:19Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:30+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}