{
 "schema": "ausmt-station",
 "version": "0.1",
 "ausmt_id": "au.milligan-extension-1988.LPD",
 "station": "LPD",
 "survey": "Eyre Peninsula Northern Extension 1988",
 "survey_id": "milligan-extension-1988",
 "country": "Australia",
 "organisation": "Flinders University",
 "location": {
  "lat": -33.06,
  "lon": 136.84
 },
 "data": {
  "type": "GDS",
  "n_periods": 6,
  "period_min_s": 319.795331,
  "period_max_s": 10200.02244
 },
 "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 digitised from Kusi, S. K. (1996) PhD thesis, The\nFlinders University of South Australia, Appendix III 'Transfer functions and\nParkinson arrows'.  Digitisation: GDS/inventories/kusi1996_data.csv; station\npositions and names: GDS/inventories/kusi1996_stations.csv (Kusi Table 3.1).\nCompanion publication of the deployment: Milligan, P. R., White, A. and\nChamalaun, F. H. (1989) Explor. Geophys. 20, 187-190.\n\nCONVENTION: Appendix III prints TX, TY as 'the real parts of the transfer\nfunctions in the x (northward) and y (eastward) directions', so\nTXR/TXI/TYR/TYI are the printed values with no sign change.  The printed\nANGLE column satisfies ANGLE = atan2(-TY,-TX) + d, the sign-reversed polar\nParkinson convention, and the printed RADIUS equals hypot(TX,TY) on 446 of\nthe appendix's 450 rows.\n\nFRAME: the thesis says both the components and the angles are geographic,\nbut its own numbers contradict that: ANGLE - atan2(-TY,-TX) is a constant\nper station, matching the South Australian declination, so one of the two is\nreferenced to magnetic north.  The components are written here exactly as\nprinted; the constant implied for THIS station is quoted below.  No rotation\nhas been applied.\n\nVARIANCES: Appendix III's column key defines SD as 'the standard deviation\n(error) of the real and imaginary parts of the transfer functions', one\nvalue for the real pair and one for the imaginary pair.  TXVAR.EXP and\nTYVAR.EXP are the mean of the two squared SDs.  CAUTION: the printed SD\n(0.000 to 0.004) is an order of magnitude smaller than the same table's\nprinted 1SE on the arrow radius; the two printed uncertainties are not\nmutually consistent.\n\nSTATION: LPD Lonesome Pine Dam.  Deployment directory '(not listed)', window\n(not listed). COORDINATES: Kusi Table 3.1, printed 33:3:36S / 136:50:24E.\nFRAME CONSTANT: ANGLE - atan2(-TY,-TX) = +6.80 deg (median over the six\nprinted periods) at this station. This station fills a placeholder shell\nheld in the kit's edi-shells/ directory; the shell carries no data and must\nnever be served as data. Dates in this file are ISO 8601.  The deployment\nwindow is known only to the month (February 1988), so ACQDATE is\ndeliberately absent. SOURCE NOTE: listed within Table 3.1's Feb-1988 block\nbut absent from the Appendix II archive listing; Kusi et al. 1998 Fig. 2\nshows it as a Feb 1988 occupation (Milligan et al. 1989 northern-extension\nsite); no EDI in any holding"
 },
 "distribution": {
  "edi_available": true,
  "license": "CC-BY-4.0",
  "edi_path": "edi/milligan-extension-1988/LPD.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": "LPD.edi",
  "input_sha256": "f5dc5692b932b546397e48a6cdac6e5d20b701e1fbc31da41056865f0756ab0f"
 },
 "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/milligan-extension-1988/LPD.edi"
  },
  {
   "id": "mth5",
   "kind": "transfer_function",
   "format": "mth5",
   "provenance_role": "derived",
   "representation_role": "alternate",
   "path": "h5/milligan-extension-1988/LPD.h5"
  },
  {
   "id": "edi-zip",
   "kind": "archive",
   "format": "zip",
   "path": "bundles/milligan-extension-1988-edi.zip"
  },
  {
   "id": "survey-mth5",
   "kind": "archive",
   "format": "mth5",
   "path": "bundles/milligan-extension-1988-tf.h5"
  }
 ]
}