KUON GEO

KUON GEO › Japan's data, measured and open

KUON GEO · Japan data layers

Japan's data, measured and open

KUON GEO is an observation institution: we capture public data at the moment it exists, preserve it with full provenance, and co-register it on one space-time frame. These Japan layers are free to reuse — vector PMTiles you can drop straight into your own map.

Open layers

Each layer is a public vector PMTiles file (CORS-enabled). View it on the live map, or reuse it in your own app or GIS.

LayerSourceOriginal licenseEditionMap
Aging & elderly (by district)Aging rate and elderly-household share for every town-block (chōchōaza) — the base layer for care-priority analysis. e-Stat · 2020 Census small-area (Statistics Bureau of Japan) Japan Gov Standard Terms 2.0 (CC BY 4.0 compatible) 2020 View on map →
Densely Inhabited Districts (DID)Census-defined concentrated-population districts (also the basis for drone-rule areas). e-Stat · 2020 Census DID (Statistics Bureau of Japan) Japan Gov Standard Terms 2.0 2020 View on map →
Medical facilitiesHospitals and clinics nationwide, with facility type and bed count. MLIT National Land Numerical Information · P04 medical facilities MLIT National Land NI Terms (open data) FY2020 View on map →
Bus stopsNationwide bus stops with operator — a transit-access base layer. MLIT National Land Numerical Information · P11 bus stops MLIT National Land NI Terms (open data) FY2022 View on map →
Fatal-crash recordsLocations of fatal traffic crashes, 2019–2024 (aggregated records, shown neutrally). National Police Agency · traffic-accident open data PDL1.0 (commercial OK, attribution) 2019–2024 View on map →

Open the Care Set — elderly × medical × fatal crashes — on the live map →

Reuse the data

The tiles are already public — no key, no account. Point MapLibre GL at the PMTiles URL:

// MapLibre GL + PMTiles — no key, no account
const p = new pmtiles.Protocol();
maplibregl.addProtocol('pmtiles', p.tile);
map.addSource('koureika', {
  type: 'vector',
  url: 'pmtiles://https://kuongeo.com/tiles/pmt/koureika-japan-2020.pmtiles'
});
map.addLayer({ id: 'koureika', type: 'fill',
  source: 'koureika', 'source-layer': 'town' });

PMTiles URLs (CORS *):

In QGIS, add a Vector Tiles / PMTiles connection to the same URL. Coordinates are EPSG:4326.

License & responsibility

KUON's processing (tiling, normalization) is released under CC BY 4.0 — reuse freely, including commercially, with attribution. Please also honor each original source's terms. These are measured / aggregate facts, not an assessment of any place's safety or of any individual; use for advice or warnings is at your own responsibility.

Attribution (copy this)

Map data © KUON GEO (CC BY 4.0) · Sources: e-Stat, MLIT National Land Numerical Information, National Police Agency

How it's built — and why you can trust it

We publish only measured facts, with provenance. Here is exactly how each layer is made.

Pipeline

Official source → original preserved unmodified → reprojected to EPSG:4326 → vector tiles via tippecanoe → PMTiles → self-hosted, served with HTTP Range by our Cloudflare Worker. Every step and date is recorded.

Only measured, sourced values — no AI-generated or invented detail, and we never hide the limits of resolution, projection or capture date. We display aggregate figures; we do not advise, warn, or rank people or places. A colour is a number, not a judgement.

Why this is unique

Anyone can process today's public data. KUON's edge is the compounding archive — the Earth captured at each moment, unretrievable later — and co-registration: these layers share one space-time frame with our RTK network, weather and space-weather archives. That is what a latecomer cannot back-fill.

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Cite this

Cite as: KUON GEO, “Open Japan geospatial data layers”, kuongeo.com/japan.

Updated: 2026-07-06 · Contact: 369@kotaroasahina.com