Data & Methodology

Principles

1. Only measured facts. We publish measurements, not fabrications. No AI-generated detail is ever presented as observation.
2. Originals are kept unmodified. Any normalization or transformation lives in a separate layer; the raw original is never overwritten.
3. We self-verify on capture. Integrity is checked at collection time (e.g. CRC24Q on RTCM) so silent corruption cannot accumulate unnoticed.
4. Provenance is recorded. When, from where and by which method — stamped into every artefact. Provenance is what makes the record evidence.
5. Preserved in three layers. Redundant storage, a daily export, and an append-only archive. Once recorded, we do not lose it.

What we collect

Each dataset below is recorded every day and kept as an unmodified original with provenance. “Since” is the first day of measurement — the record grows from there.

Methodology

Uptime measurement

We poll the public NTRIP sourcetables every 10 minutes — up to 144 observations per station per day — and record each station's up/down state. Measurement started on 2026-07-03. Uptime is hidden until at least 7 days of data exist, so early, unfair numbers are never shown; the displayed window is up to 30 days.

Richness score (0–12)

Computed from each station's RTCM message mix. It is a record of what a station broadcasts — the richness of its information — not a judgement of its quality (the optimal set depends on use). Formerly published as “sensitivity”; renamed in 2026-07 to avoid confusion with receiver sensitivity.

• +3 MSM7 observation messages
• +2 MSM4/MSM5 observation messages
• +1 per GNSS constellation (GPS, GLONASS, Galileo, QZSS, BeiDou)
• +2 station coordinate messages (RTCM 1005/1006)
• +1 high-grade receiver

Maximum 12. The same logic runs on the map, the ranking and our station selection, so the number is consistent everywhere.

Coordinate, geoid and declination models

Coordinates are converted client-side across WGS84, DMS, UTM, MGRS, Plus Codes, Japan Plane Rectangular (JGD2011), Web Mercator, ECEF and geohash. Ellipsoidal-to-orthometric height uses the GSI Geoid 2024 model (Japan). Magnetic declination is computed from the World Magnetic Model WMM2025 (NOAA/NGA/BGS), worldwide.

RINEX conversion & quality

Raw-to-RINEX conversion is performed by RTKLIB convbin. Hatanaka compression uses RNXCMP (GSI); per its citation requirement we cite Hatanaka, Y. (2008), Bull. GSI, 55, 21-30. RINEX QC reports basic statistics only (epochs, gaps, per-constellation counts) — cycle-slip and multipath metrics are not included. Uploaded files auto-delete after 24 hours.

Privacy & handling

• No account, no ads, and no third-party analytics (we do not use Google Analytics). We count visits ourselves, filter bots, and never track individuals.
• Conversion tools (RINEX, Hatanaka, QC) process on a server and auto-delete uploads after 24 hours. The RINEX viewer, track converter and coordinate readout run entirely on your device and upload nothing.

Sources & licenses

We stand on the shoulders of open data and open standards. Full attribution:

• OpenStreetMap contributors — ODbL — base map data
• CARTO / OpenFreeMap — Vector base map styles
• Esri World Imagery — Satellite base layer
• RTK2GO — Community NTRIP caster
• BizStation (ntrip1.bizstation.jp) — Community NTRIP caster (Japan)
• GeoRTK.jp — Community NTRIP caster (Japan)
• Centipede-RTK — Community NTRIP network (worldwide)
• City of Sapporo — Bear-sighting open data (CC BY 4.0)
• Ministry of the Environment, Japan — Bear-sighting statistics (PDL)
• Japan Meteorological Agency (JMA) — Weather warnings / advisories
• RainViewer — Weather radar
• Open-Meteo — Gridded weather
• CelesTrak — Satellite TLE
• GSI (Geospatial Information Authority of Japan) — Geoid 2024, DEM, RNXCMP
• Mapzen / AWS Terrain Tiles — Global elevation
• NOAA / NGA / BGS — World Magnetic Model WMM2025
• RTKLIB — convbin — RINEX conversion
• Hatanaka, Y. (2008), Bull. GSI, 55, 21-30 — RNXCMP / Hatanaka compression (cited)

Provenance & preservation

Every original is kept unmodified with provenance metadata (time, source, instrument, processing history). Data is preserved across three layers — redundant storage, a daily export, and an append-only archive that cannot be deleted — so a moment of the Earth, once recorded, is not lost. Restoration is always a human decision, following a disaster-recovery runbook.

Who runs it

KUON GEO is the GPS / positioning division of Kuon R&D (空音開発). It is run by Kotaro Asahina (朝比奈幸太郎; legal name Kotaro Hattori / 服部洸太郎), an acoustic and web engineer in Obihiro, Hokkaido, Japan. Contact and corrections: 369@kotaroasahina.com.