{
 "schema": "ausmt-station",
 "version": "0.1",
 "ausmt_id": "au.grampians-2016.GRA20",
 "station": "GRA20",
 "survey": "Grampians Transect 2016",
 "survey_id": "grampians-2016",
 "country": "Australia",
 "organisation": "Adelaide University",
 "location": {
  "lat": -37.554766,
  "lon": 142.702412
 },
 "data": {
  "type": "BBMT",
  "n_periods": 56,
  "period_min_s": 0.0064,
  "period_max_s": 2183.405637
 },
 "diagnostics": {
  "median_relative_error": 0.064,
  "remote_reference": false,
  "tipper_available": false,
  "completeness_smoothness_diagnostic": {
   "value": 4.0,
   "basis": "e",
   "note": "not a quality or geological-value judgement"
  },
  "classification": "3-D",
  "skew_beta_median_deg": 9.8,
  "pct_periods_3d": 88,
  "method": "phase-tensor (Caldwell 2004)",
  "note": "screening diagnostic, not an interpretation product"
 },
 "processing": {
  "software": null,
  "algorithm": null,
  "remote_reference": false,
  "remote_site": null,
  "file_written_by": {
   "name": "Geotools",
   "version": "4.0.5.12583"
  },
  "note": "source.file=GRA20.edi (Grampians_Delamerian/GRA20.edi)\nsource.collection=Adelaide University's own Geotools 4.0.5.12583 export of the Grampians Transect 2016 survey, the files the custodian holds, folder Grampians_Delamerian\nsource.sha256=a7a5653fa18bf9617d88f14f6460f6f5a813400122faed248e1abfe7228f145d\nsource.copy=provenance/as-delivered/GRA20.edi in this package, byte identical to the delivery\nrepair.defect=ACQDATE=08/01/16 and FILEDATE=09/19/26 are printed month first with a two digit year; a reader that takes either value day first, or resolves the two digit year as a year in the third century, publishes a date the delivery does not state\nrepair.change=ACQDATE rewritten 08/01/16 to 2016-08-01 and FILEDATE rewritten 09/19/26 to 2026-09-19; the nine line record inserted after >INFO; no other byte changed\nrepair.basis=the delivery prints month first: all 29 FILEDATE values are 09/19/26, whose second field 19 exceeds 12, so no FILEDATE in this delivery can be read day first, and Geotools 4.0.5.12583 wrote every one of the 29 files and prints 01/01/01 where its project held no date. The two digit years are named by the caller, 16=2016 and 26=2026, and nothing is guessed\nrepair.ruling=the repair rule of owner ruling 2026-09-18: a header defect the reader misreads is repaired in the served copy, the delivered file is kept under provenance/as-delivered/ and the change is recorded in the served file\nrepair.by=AusMT, _tools/repair_edi_header_dates.py\nMAXINFO=4"
 },
 "distribution": {
  "edi_available": true,
  "license": "CC-BY-4.0",
  "edi_path": "edi/grampians-2016/GRA20.edi"
 },
 "provenance": {
  "pipeline": "ausmt/extract.build_portal",
  "pipeline_version": "0.2.1",
  "extractor": "mt_metadata (community canonical)",
  "software": {
   "python": "3.12.14",
   "mt_metadata": "1.0.10",
   "mth5": "0.6.8"
  },
  "git_commit": "e208b15fb70740d8c44de51c532e6debd59c4e24",
  "parameters": {
   "dimensionality": {
    "beta_per_period_deg": 3.0,
    "skew_3d_deg": 5.0,
    "pct_periods_3d_threshold": 40,
    "ellip_2d_deg": 0.1,
    "min_rez_row_sine": 0.01,
    "beta_physical_cap_deg": 15.0,
    "min_usable_period_frac": 0.5,
    "skew_aggregation": "median"
   },
   "diagnostic": "completeness/smoothness (median rel error + coverage + smoothness)"
  },
  "generated": "2026-09-20T04:08:35.832153+00:00",
  "input_file": "GRA20.edi",
  "input_sha256": "1a545a81806a598a2feca3759fda012332c48e41c1049bde68542233e5cfc141"
 },
 "coordinate_qc": null,
 "canonical_conditioning": [
  "survey.id->grampians-2016",
  "sign_convention: '+' is a library default — EDI carries no machine-readable sign convention; NOT asserted by source",
  "declination.epoch/model: library defaults (epoch=None, model=IGRF) — an EDI states only the declination value; epoch/model NOT asserted by source",
  "channel orientations: degenerate/defaulted (ex and ey azimuths both 0 deg — parallel dipoles are non-physical); orientations NOT asserted by source EMEAS geometry",
  "citation.authors<-survey_meta:Adelaide University",
  "citation.title<-survey_meta",
  "copyright.release_status=Data Citation Required; conditions_of_use set from licence CC-BY-4.0 (replaced mt_metadata default boilerplate)"
 ],
 "frame": {
  "convention_check": {
   "detail": null,
   "n_periods_used": 56,
   "phs_xy_median_deg": 45.59,
   "phs_yx_median_deg": -140.8,
   "verdict": "ok"
  },
  "declared_azimuth_deg": -55.0,
  "derotated": false,
  "evidence": {
   "branch": "mt",
   "emeas_azimuths": {
    "ex": null,
    "ey": null
   },
   "hmeas_azimuths": {
    "hx": 0.0,
    "hy": 90.0
   },
   "rotspec": null,
   "trot": "-55",
   "zrot": "-55"
  },
  "frame_served": "declared-azimuth",
  "impedance_rotation_deg_source": null,
  "tipper_rotation_deg_source": null
 },
 "runs": [
  {
   "id": "GRA20_001",
   "time_period": {
    "start": "2016-06-18T05:23:31.000000+00:00",
    "end": "2016-06-19T21:57:00.000000+00:00"
   },
   "sample_rate_hz": 1000.0,
   "data_logger": {
    "manufacturer": "Earth Data Ltd",
    "model": "PR6-24",
    "serial_number": "60771",
    "identifiers": [
     {
      "scheme": "DOI",
      "identifier": "10.82388/sp7hw1av"
     }
    ]
   },
   "channels": [
    {
     "component": "ex",
     "dipole_length_m": 49.0
    },
    {
     "component": "ey",
     "dipole_length_m": 44.5
    },
    {
     "component": "hx",
     "sensor": {
      "manufacturer": "LEMI",
      "model": "LEMI-120",
      "serial_number": "244",
      "identifiers": [
       {
        "scheme": "DOI",
        "identifier": "10.82388/3y6e9dem"
       }
      ]
     }
    },
    {
     "component": "hy",
     "sensor": {
      "manufacturer": "LEMI",
      "model": "LEMI-120",
      "serial_number": "245",
      "identifiers": [
       {
        "scheme": "DOI",
        "identifier": "10.82388/mwqtg78c"
       }
      ]
     }
    }
   ]
  }
 ],
 "resources": [
  {
   "id": "edi",
   "kind": "transfer_function",
   "format": "edi",
   "provenance_role": "source",
   "representation_role": "original",
   "path": "edi/grampians-2016/GRA20.edi",
   "related_collection_identifiers": [
    {
     "scheme": "DOI",
     "identifier": "10.4225/41/5a618c3ae30ab",
     "identifies": "collection"
    }
   ]
  },
  {
   "id": "emtfxml",
   "kind": "transfer_function",
   "format": "emtfxml",
   "provenance_role": "derived",
   "representation_role": "alternate",
   "path": "xml/grampians-2016/GRA20.xml",
   "related_collection_identifiers": [
    {
     "scheme": "DOI",
     "identifier": "10.4225/41/5a618c3ae30ab",
     "identifies": "collection"
    }
   ]
  },
  {
   "id": "mth5",
   "kind": "transfer_function",
   "format": "mth5",
   "provenance_role": "derived",
   "representation_role": "alternate",
   "path": "h5/grampians-2016/GRA20.h5",
   "related_collection_identifiers": [
    {
     "scheme": "DOI",
     "identifier": "10.4225/41/5a618c3ae30ab",
     "identifies": "collection"
    }
   ]
  },
  {
   "id": "edi-zip",
   "kind": "archive",
   "format": "zip",
   "path": "bundles/grampians-2016-edi.zip",
   "related_collection_identifiers": [
    {
     "scheme": "DOI",
     "identifier": "10.4225/41/5a618c3ae30ab",
     "identifies": "collection"
    }
   ]
  },
  {
   "id": "xml-zip",
   "kind": "archive",
   "format": "zip",
   "path": "bundles/grampians-2016-xml.zip",
   "related_collection_identifiers": [
    {
     "scheme": "DOI",
     "identifier": "10.4225/41/5a618c3ae30ab",
     "identifies": "collection"
    }
   ]
  },
  {
   "id": "survey-mth5",
   "kind": "archive",
   "format": "mth5",
   "path": "bundles/grampians-2016-tf.h5",
   "related_collection_identifiers": [
    {
     "scheme": "DOI",
     "identifier": "10.4225/41/5a618c3ae30ab",
     "identifies": "collection"
    }
   ]
  }
 ]
}