{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://docs.demiton.io/registers/survey_control/v1.json",
  "title": "survey_control contract v1",
  "type": "object",
  "required": [
    "mark_id",
    "project"
  ],
  "properties": {
    "crs": {
      "type": "string",
      "description": "the coordinate reference system identifier, e.g. EPSG:7844 or EPSG:7855",
      "x-demiton-requiredness": "optional"
    },
    "easting": {
      "type": "number",
      "description": "the mark's grid easting",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "m",
      "x-demiton-type": "decimal"
    },
    "mark_id": {
      "type": "string",
      "description": "the mark's identifier",
      "x-demiton-requiredness": "required"
    },
    "project": {
      "type": "string",
      "description": "the project the mark controls",
      "x-demiton-requiredness": "required",
      "x-demiton-reference": true
    },
    "latitude": {
      "type": "number",
      "description": "the mark's GDA2020 latitude",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "degrees",
      "x-demiton-type": "decimal"
    },
    "map_zone": {
      "type": "integer",
      "description": "the MGA zone the grid coordinates are in",
      "x-demiton-requiredness": "optional"
    },
    "northing": {
      "type": "number",
      "description": "the mark's grid northing",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "m",
      "x-demiton-type": "decimal"
    },
    "longitude": {
      "type": "number",
      "description": "the mark's GDA2020 longitude",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "degrees",
      "x-demiton-type": "decimal"
    },
    "mark_type": {
      "type": "string",
      "description": "the kind of mark",
      "x-demiton-requiredness": "optional"
    },
    "ahd_height": {
      "type": "number",
      "description": "the height on the Australian Height Datum",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "m",
      "x-demiton-type": "decimal"
    },
    "mark_alias": {
      "type": "string",
      "description": "another name the mark is known by",
      "x-demiton-requiredness": "optional"
    },
    "external_id": {
      "type": "string",
      "description": "the source's own record id, where it differs from the mark id",
      "x-demiton-requiredness": "optional"
    },
    "mark_status": {
      "type": "string",
      "description": "the mark's condition, e.g. intact, damaged or destroyed",
      "x-demiton-requiredness": "optional"
    },
    "legacy_class": {
      "type": "string",
      "description": "the class the mark was given before SP1 retired class and order",
      "x-demiton-requiredness": "optional"
    },
    "legacy_order": {
      "type": "string",
      "description": "the order the mark was given under the same retired scheme",
      "x-demiton-requiredness": "optional"
    },
    "monument_type": {
      "type": "string",
      "description": "the physical monument",
      "x-demiton-requiredness": "optional"
    },
    "last_visited_on": {
      "type": "string",
      "description": "when the mark was last visited",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "day",
      "format": "date",
      "x-demiton-type": "date"
    },
    "uncertainty_kind": {
      "type": "string",
      "description": "positional, relative or survey uncertainty",
      "x-demiton-requiredness": "optional"
    },
    "coordinate_lineage": {
      "type": "string",
      "description": "the adjustment or source the coordinates come from",
      "x-demiton-requiredness": "optional"
    },
    "ellipsoidal_height": {
      "type": "number",
      "description": "the height above the GDA2020 ellipsoid",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "m",
      "x-demiton-type": "decimal"
    },
    "vertical_uncertainty_m": {
      "type": "number",
      "description": "the vertical uncertainty at 95% confidence",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "m",
      "x-demiton-type": "decimal"
    },
    "coordinates_published_on": {
      "type": "string",
      "description": "when the coordinates were published",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "day",
      "format": "date",
      "x-demiton-type": "date"
    },
    "horizontal_uncertainty_m": {
      "type": "number",
      "description": "the horizontal uncertainty at 95% confidence",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "m",
      "x-demiton-type": "decimal"
    }
  },
  "x-demiton-register-type": "survey_control",
  "x-demiton-contract-version": "1.0.3",
  "x-demiton-store": "tenant",
  "x-demiton-axes": [],
  "x-demiton-measures": [],
  "x-demiton-provenance": {
    "standards": [
      {
        "code": "AHD / AUSGeoid2020",
        "title": "Australian Height Datum with AUSGeoid2020 separation model",
        "access": "full_text_verified",
        "region": "Australia",
        "edition": "AHD71; AUSGeoid2020",
        "checked_on": "2026-09-14"
      },
      {
        "code": "GDA2020 / MGA2020",
        "title": "Geocentric Datum of Australia 2020 and Map Grid of Australia 2020",
        "access": "full_text_verified",
        "region": "Australia",
        "edition": "GDA2020 (ITRF2014 @ 2020.0)",
        "checked_on": "2026-09-14"
      },
      {
        "code": "ICSM SP1",
        "title": "Standard for the Australian Survey Control Network (Special Publication 1)",
        "access": "full_text_verified",
        "region": "Australia",
        "edition": "v2.2 (2020)",
        "checked_on": "2026-09-14"
      },
      {
        "code": "National Measurement (Recognized-Value Standard of Measurement of Position) Determination 2017",
        "title": "Legal definition of GDA2020 under National Measurement Act 1960 (Cth) s 8A",
        "access": "public_summary",
        "clause": "s 8A NMA 1960",
        "region": "Australia",
        "edition": "2017 (a 2026 Determination is cited elsewhere; conflicting)",
        "checked_on": "2026-09-14"
      },
      {
        "code": "INSPIRE Data Specification on Coordinate Reference Systems (D2.8.I.1)",
        "title": "INSPIRE CRS Technical Guidelines: ETRS89 horizontal, EVRS vertical",
        "access": "full_text_verified",
        "region": "European Union",
        "edition": "TG v3.2rc2 (release 2024.1)",
        "checked_on": "2026-09-14"
      },
      {
        "code": "EPSG Geodetic Parameter Dataset",
        "title": "IOGP CRS registry (EPSG:7844 GDA2020, EPSG:7855 MGA zone 55, EPSG:4326 WGS 84 ensemble)",
        "access": "full_text_verified",
        "region": "International",
        "edition": "v13.102",
        "checked_on": "2026-09-14"
      },
      {
        "code": "NZGD2000 / NZTM2000 / NZVD2016",
        "title": "New Zealand Geodetic Datum 2000, NZ Transverse Mercator 2000, NZ Vertical Datum 2016 (NZGeoid2016)",
        "access": "full_text_verified",
        "region": "New Zealand",
        "edition": "NZGD2000 (1998); NZVD2016 (2016)",
        "checked_on": "2026-09-14"
      },
      {
        "code": "OSGB36 / ETRS89 / OSTN15 / OSGM15 (ODN)",
        "title": "Ordnance Survey National Grid, ETRS89 and the definitive transformations",
        "access": "full_text_verified",
        "region": "United Kingdom",
        "edition": "OSTN15 / OSGM15",
        "checked_on": "2026-09-14"
      },
      {
        "code": "NAD 83(2011) / NAVD 88 (NSRS)",
        "title": "US official horizontal and vertical datums, being replaced by NATRF2022 et al.",
        "access": "full_text_verified",
        "region": "United States",
        "edition": "NAD 83 (2011/PA11/MA11) epoch 2010.00; NAVD 88",
        "checked_on": "2026-09-14"
      }
    ]
  },
  "description": "Survey control marks in GDA2020 / MGA2020.",
  "x-demiton-contract-url": "https://docs.demiton.io/registers/survey_control/",
  "x-demiton-register-catalog": "https://docs.demiton.io/concepts/register-catalog"
}