{
 "schema": "ausmt-station",
 "version": "0.1",
 "ausmt_id": "au.code-15-southwest-wa.CRI54A",
 "station": "CRI54A",
 "survey": "Southwest Western Australia Array",
 "survey_id": "code-15-southwest-wa",
 "country": "Australia",
 "organisation": "Flinders University",
 "location": {
  "lat": -34.5619,
  "lon": 118.7008
 },
 "data": {
  "type": "GDS",
  "n_periods": 17,
  "period_min_s": 388.802488,
  "period_max_s": 27306.736572
 },
 "diagnostics": {
  "median_relative_error": null,
  "remote_reference": false,
  "tipper_available": true,
  "completeness_smoothness_diagnostic": {
   "value": null,
   "basis": "s",
   "note": "not a quality or geological-value judgement"
  },
  "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": null,
   "version": null
  },
  "note": "Tipper transfer functions regenerated from the compilation register\nGDS/GADataBase/AllStationData.lst, joined on STATION_ID to\nGDS/GADataBase/AllStationName.lst.  The register is Liejun Wang's Australian\nElectromagnetic Database as supplied to the NCI compilation.\n\nSUPERSEDES a September 2002 FORTRAN conversion (gadata_new.f) of these same\nregister rows.  That conversion truncated coordinates to two decimals, read\nwhole-degree coordinates under an implied-decimal format, discarded the\nregister's uncertainty columns and wrote a constant tipper variance of 0.01,\nwrote hard-coded placeholder impedances and Ex/Ey/Rx/Ry channels for a\nmagnetometer-only instrument, copied one template header into every file so\nthat all of them claimed the same acquirer, date, prospect and location,\nnever read the register's REFERENCE_CODE field at all, named its output on\nthe three-letter code so colliding codes overwrote one another, and declared\nORDER=DEC unconditionally.  The response VALUES it wrote were correct and\nare unchanged here to print precision; everything around them was not.\n\nCONVENTION: the register stores induction arrows in sign-reversed polar\nParkinson form, R_ANGLE = atan2(-Ty,-Tx) measured clockwise from north and\nR_RADIUS = hypot(Tx,Ty), so\nTXR = -R_RADIUS.cos(R_ANGLE)    TYR = -R_RADIUS.sin(R_ANGLE)\nTXI = -Q_RADIUS.cos(Q_ANGLE)    TYI = -Q_RADIUS.sin(Q_ANGLE).\n\nCOORDINATES are the register's PRINTED values, at their full precision, and\nevery one has been checked to fall inside the Australian region.\n\nFREQUENCIES are 1/(period in seconds), the register's PERIOD column being in\nminutes for every one of its arrays.  Rows are sorted to strictly descending\nfrequency and the ORDER declaration is verified against the emitted values.\n\nIMPEDANCE is not written and no electric or remote-reference channel is\ndeclared.  This is a vertical-field (GDS) measurement: the instrument\nrecorded Hx, Hy and Hz alone.\n\nVARIANCES: the register prints RR1ST/QR1ST (1 standard error on the arrow\nradius) and RA1ST/QA1ST (1 standard error on the arrow angle, in degrees)\nfor this reference code.  TXVAR.EXP and TYVAR.EXP propagate them onto the\ncomponents,\nvar(Tx) = (cos A . sR)^2 + (R . sin A . sA)^2,\nvar(Ty) = (sin A . sR)^2 + (R . cos A . sA)^2, sA in radians,\naveraged over the in-phase and quadrature pairs.  The block holds a\nvariance, not a standard deviation.\n\nATTRIBUTION OPEN: the identity of register reference code 15 is unresolved.\nThe Everett and Hyndman hypothesis is refuted, their 1967a paper holding\nonly the ten-station Perth-Norseman-Rawlinna traverse.  The SITE##A number\nis a Chamalaun/Walker fluxgate serial reused across Flinders deployments,\nwhich points to a Flinders array but does not name it.  ACQBY is therefore\nabsent.  The DATA are sound; only the array's name is unknown.\n\nThe acquisition years of this array are unknown, so ACQDATE is absent.\n\nIDENTITY: register STATION_ID 290, FULL_NAME CRI54A, SHO CRI, REFERENCE_CODE\n15, register E_LONG 118.7008, S_LAT -34.5619, MAG_DEC -1.501.  This file is\npublished as station au.code-15-southwest-wa.CRI54A. Identity is the\nSTATION_ID plus the coordinate, never the three-letter SHO code: SHO codes\ncollide across the compilation, and naming the 2002 conversion's output\nfiles on the code lost 35 stations to overwrite. Dates in this file are ISO\n8601."
 },
 "distribution": {
  "edi_available": true,
  "license": "CC-BY-4.0",
  "edi_path": "edi/code-15-southwest-wa/CRI54A.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": "25c90921c42c72bbc5455b4bbdab9137cf8b8e48",
  "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": "2026-09-09T06:22:47.791693+00:00",
  "input_file": "CRI54A.edi",
  "input_sha256": "d780c4d7a2948dcb02ec26089136246bbf941d9ec0423022342cf3a044964d39"
 },
 "coordinate_qc": null,
 "canonical_conditioning": null,
 "frame": {
  "evidence": {
   "branch": "mt",
   "zrot": null,
   "trot": null,
   "rotspec": null,
   "hmeas_azimuths": {
    "hx": 0.0,
    "hy": 90.0
   },
   "emeas_azimuths": {
    "ex": null,
    "ey": null
   }
  },
  "impedance_rotation_deg_source": null,
  "tipper_rotation_deg_source": null,
  "derotated": false,
  "frame_served": "declared-zero",
  "declared_azimuth_deg": 0.0,
  "convention_check": {
   "verdict": "insufficient",
   "phs_xy_median_deg": null,
   "phs_yx_median_deg": null,
   "n_periods_used": 0,
   "detail": "only 0 usable period(s) (< 5) — no convention verdict"
  }
 },
 "resources": [
  {
   "id": "edi",
   "kind": "transfer_function",
   "format": "edi",
   "provenance_role": "source",
   "representation_role": "original",
   "path": "edi/code-15-southwest-wa/CRI54A.edi"
  },
  {
   "id": "mth5",
   "kind": "transfer_function",
   "format": "mth5",
   "provenance_role": "derived",
   "representation_role": "alternate",
   "path": "h5/code-15-southwest-wa/CRI54A.h5"
  },
  {
   "id": "edi-zip",
   "kind": "archive",
   "format": "zip",
   "path": "bundles/code-15-southwest-wa-edi.zip"
  },
  {
   "id": "survey-mth5",
   "kind": "archive",
   "format": "mth5",
   "path": "bundles/code-15-southwest-wa-tf.h5"
  }
 ]
}