{ "schema": "ausmt-station", "version": "0.1", "ausmt_id": "au.samas-1995.NCP", "station": "NCP", "survey": "SAMAS 1995", "survey_id": "samas-1995", "country": "Australia", "organisation": "Flinders University", "location": { "lat": -35.652, "lon": 140.5 }, "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 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: Whellams, J. M. (1996) PhD thesis, The Flinders University of\nSouth Australia; SAMAS is the author's own acronym for the base-station\narray. The register carries the full seventeen-period grid, richer than the\nfour periods printed in the thesis.\n\nFieldwork: recording began at the northern stations on 2 April 1995 and at\nthe southern stations on 12 April 1995, the instruments being retrieved in\nmid May 1995. Those are stage days for the array, not per-station recording\ndays, so ACQDATE is absent, as it is in this package's already-published\nminted files.\n\nIDENTITY: register STATION_ID 485, FULL_NAME NCP, SHO NCP, REFERENCE_CODE\n12, register E_LONG 140.5, S_LAT -35.652, MAG_DEC 9.128. This file is\npublished as station au.samas-1995.NCP. Identity is the STATION_ID plus the\ncoordinate, never the three-letter SHO code: SHO codes collide across the\ncompilation, and naming the 2002 conversion's output files on the code lost\n35 stations to overwrite. Dates in this file are ISO 8601." }, "distribution": { "edi_available": true, "license": "CC-BY-4.0", "edi_path": "edi/samas-1995/NCP.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": "NCP.edi", "input_sha256": "618d5bfb03406ca46a712c0cdb44b35061c384217b2e5b01b701dee30d471b18" }, "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/samas-1995/NCP.edi" }, { "id": "mth5", "kind": "transfer_function", "format": "mth5", "provenance_role": "derived", "representation_role": "alternate", "path": "h5/samas-1995/NCP.h5" }, { "id": "edi-zip", "kind": "archive", "format": "zip", "path": "bundles/samas-1995-edi.zip" }, { "id": "survey-mth5", "kind": "archive", "format": "mth5", "path": "bundles/samas-1995-tf.h5" } ] }