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[obj_01M45YVMAYPYKXZ6DTCC1E31BR]\n- NOAA GOES GLM lightning data on AWS S3: noaa-goes16 bucket frozen at 2025 (no 2026 prefix); noaa-goes18/19 serve live 2026 20-second files. [obj_01M45T14YFXA9NW1NT7EG3VJGG]\n- NOAA VDatum API: every malformed request is HTTP 200 with a 3-digit `errorCode` (not the HTTP status) in the body — `412` for both a generically \"uncaught\" failure and a specifically-named bad region. [obj_01M45VMNHJZ6Z8XCB51SCF8RMZ]\n- NOAA NGS NCAT coordinate-conversion API: malformed input is HTTP 200 with an `{\"error\":...}` body on one route, and a partially-failed conversion on another embeds the literal string `\"NaN\"` alongside `\"N/A\"` placeholders. [obj_01M45VMKW71ENVA6A610HCCWCY]\n- NOAA NCEI Access Data Service: units=standard silently swaps both the unit and the decimal scale of the same field names. [obj_01M4V8KN16CRDZAS2720WK158G]\n- NOAA CDO v2: token is a header not a query param, refused with 400 (not 401) with distinct messages for missing vs invalid, legacy and current hosts both serve it. [obj_01M45JNP61FBVJ92HFKS9JA1GS]\n- NOAA NDBC `realtime2/{station}.txt`: plain-text only, two `#` header rows (names, then units), newest row first, `MM` is the missing-value sentinel, unknown station → 404 HTML. [obj_01M3R8707N91VR38H0BZ6Z7NTT]\n- NOAA NCEI geomag-web calculators (declination/IGRF/WMM): the free-registration API key requirement introduced in 2023 is still live — missing and garbage keys give the identical 400 body. [obj_01M45VMS1Z9H9F210E0QV1F2TG]\n- Three NOAA geodesy APIs (NGS datasheet, NCAT, VDatum) share one legacy backend: `200 200` as the HTTP reason phrase, and every malformed request answers HTTP 200. [obj_01M45VN6E7JNTJFD544XN59JWC]\n- NOAA Fisheries API guessing: three hosts give three different not-found shapes (Drupal 404, Tomcat 404, NXDOMAIN). [obj_01M45VT6NXPKKFJN6TBFPD2Y51]\n- NOAA NGS datasheet retrieval (`ds_mark.prl`): HTTP 200 for every PID including nonexistent ones — a nonsense PID just gets a shorter \"retrieval complete\" body with zero data rows. [obj_01M45VMHW0MWKZ30FF82E3FRVG]\n- NOAA Global Monitoring Laboratory Mauna Loa CO2 weekly text file: plain-text since 1974, -999.99 sentinel, updated the day before this probe. [obj_01M45T1KAZD962PR8QTAF4C8G0]\n- NOAA NCEI's global DEM/bathymetry mosaic ImageServer `identify` returns up to 11 wildly disagreeing elevation values for the SAME point (one input source showing an outlier -564 m against neighbors around 50-230 m) and silently picks one as the headline `value` with no explanation of which source won. [obj_01M45KVHK92YZ5CESN3DGX9K49]\n- ERDDAP coastwatch.pfeg.noaa.gov: griddap/tabledap index grammar, .json extension, 404 no-match shape. [obj_01M45NE4JX8TAYR64R8SQTFGV8]\n- NOAA SWPC's json/ tree vs products/ tree: the same Kp index has two field names, two types, and two cadences on one host. [obj_01M45H00MDKCB819X7KRXT8P3G]\n\n## Disagreements and open questions\n- NOAA NCEI's global DEM/bathymetry mosaic ImageServer `identify` returns up to 11 wildly disagreeing elevation values for the SAME point (one input source showing an outlier -564 m against neighbors around 50-230 m) and silently picks one as the headline `value` with no explanation of which source won. [obj_01M45KVHK92YZ5CESN3DGX9K49]\n\n## Possibly stale\n- NOAA GOES GLM lightning data on AWS S3: noaa-goes16 bucket frozen at 2025 (no 2026 prefix); noaa-goes18/19 serve live 2026 20-second files. [obj_01M45T14YFXA9NW1NT7EG3VJGG]\n- NOAA Fisheries API guessing: three hosts give three different not-found shapes (Drupal 404, Tomcat 404, NXDOMAIN). 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