{ "schema": "ausmt-station", "version": "0.1", "ausmt_id": "au.carpentaria-north-1995.Alexandra_River", "station": "Alexandra_River", "survey": "Carpentaria Array 1995 (Northern Sub-array)", "survey_id": "carpentaria-north-1995", "country": "Australia", "organisation": "Flinders University", "location": { "lat": -18.22, "lon": 139.88 }, "data": { "type": "GDS", "n_periods": 17, "period_min_s": 359.99712, "period_max_s": 27300.0273 }, "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 NO uncertainty columns for this station's\nrows, so TXVAR.EXP and TYVAR.EXP are OMITTED rather than fabricated. The\n2002 conversion wrote a constant 0.01 here; that value was invented and\ncarries no information.\n\nAttribution: Chamalaun, Lilley and Wang (1999) PEPI 116, 105-115.\n\nFieldwork: the northern sub-array occupied north west Queensland from June\nto August 1995. No per-station recording day is recorded in any source on\ndisk, so ACQDATE is absent.\n\nIDENTITY: register STATION_ID 188, FULL_NAME Alexandra_River, SHO ALE,\nREFERENCE_CODE 7, register E_LONG 139.88, S_LAT -18.22, MAG_DEC 6.206. This\nfile is published as station au.carpentaria-north-1995.Alexandra_River.\nIdentity is the STATION_ID plus the coordinate, never the three-letter SHO\ncode: SHO codes collide across the compilation, and naming the 2002\nconversion's output files on the code lost 35 stations to overwrite. Dates\nin this file are ISO 8601." }, "distribution": { "edi_available": true, "license": "CC-BY-4.0", "edi_path": "edi/carpentaria-north-1995/Alexandra_River.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": "Alexandra_River.edi", "input_sha256": "d4cf870b076a3f350223d306e01f1dd0c42103ad91839ec6a19706f0eb86832a" }, "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/carpentaria-north-1995/Alexandra_River.edi" }, { "id": "mth5", "kind": "transfer_function", "format": "mth5", "provenance_role": "derived", "representation_role": "alternate", "path": "h5/carpentaria-north-1995/Alexandra_River.h5" }, { "id": "edi-zip", "kind": "archive", "format": "zip", "path": "bundles/carpentaria-north-1995-edi.zip" }, { "id": "survey-mth5", "kind": "archive", "format": "mth5", "path": "bundles/carpentaria-north-1995-tf.h5" } ] }