Tokyo Digital Twin
This overview was generated with AI from the public sources listed below and checked against them before publication. It has not had a complete human fact-check — treat it as a starting point and follow the sources.
How this atlas is made · What “last verified” means · What “source-checked” means · The full record behind this page
✎ Corrected 27 Aug 2026 Record revised. What changed →
The Tokyo Metropolitan Government's Digital Twin initiative recreates the city in 3D. Its free, browser-based 3D Viewer (built on TerriaJS/Cesium) visualises buildings, roads and terrain across Tokyo's 23 wards, and in December 2024 the city released high-precision aerial point-cloud data for the wards as open data for disaster planning, urban development and research.
what does this mean?
The strongest source is the operator's or the city's own reporting — an official report, dataset or press release. It grades who did the looking — not how well the project went. All four grades →📊 Impact
The 3D Viewer is free and runs in an ordinary browser, and in December 2024 the metropolitan government published the 23 wards' aerial point cloud as open data, described by the project as the most precise such data publicly available in Japan. Its clearest use so far is disaster documentation: to support recovery after the Noto Peninsula earthquake of 1 January 2024, the TMG published slope collapses, surface cracks and post-quake point clouds on the same viewer so the state before and after could be compared.
🎓 Lesson
A city model earns its keep when something breaks. Tokyo's twin is free, browser-based and open, but the use its own government puts forward first is not planning — it is publishing what an earthquake did, on the same viewer, so before and after can be compared. The viewer itself is still labelled a beta version.
Sources
Show your work What this page rests on and what it can’t tell you · all 6 claims with their sources · the forensic record
Evidence Passport · public beta 6 addressable claims, 3 source dossiers, one permanent baseline. The passport is unreviewed — an AI-assisted structural migration, not a human or expert endorsement. Every revision keeps a permanent copy under revision history.
Inspect the claims, one by one — verbatim text, sources and caveats for all 6
The text below is copied verbatim from the published record. Each claim names the source dossiers that carry it; caveats stay attached to the claim they qualify.
clm-df0e0f424e12dc73
quantitative
Its free, browser-based 3D Viewer (built on TerriaJS/Cesium) visualises buildings, roads and terrain across Tokyo's 23 wards
Sources carrying this claim
clm-659892ca7991fa17
quantitative
in December 2024 the city released high-precision aerial point-cloud data for the wards as open data for disaster planning, urban development and research
Sources carrying this claim
clm-49b4c366098b7b18
quantitative
The 3D Viewer is free and runs in an ordinary browser, and in December 2024 the metropolitan government published the 23 wards' aerial point cloud as open data, described by the project as the most precise such data publicly available in Japan
Sources carrying this claim
clm-6242a4760a671539
quantitative
to support recovery after the Noto Peninsula earthquake of 1 January 2024, the TMG published slope collapses, surface cracks and post-quake point clouds on the same viewer so the state before and after could be compared
Sources carrying this claim
clm-4aabe5e04736eb96
descriptive
the use its own government puts forward first is not planning — it is publishing what an earthquake did, on the same viewer, so before and after can be compared
Sources carrying this claim
clm-c462940f44f48c16
descriptive
The viewer itself is still labelled a beta version
Sources carrying this claim
Forensic record — source dossiers, gaps, hashes and the exact revision this page renders
This layer records what is known about each source, what is still missing, and the exact snapshot this page is rendering. A missing date, archive or hash stays visible as missing.
Awaiting operator and domain-expert review; publication of this revision implies neither.
sha256:f3a86ff6d974a80ef34a299980bb22dc73309d3a36e575236d49e4a51dd2a044
- 6
- of 6 claims mapped
- 3
- source dossiers
- 1
- publication dates recorded
- 0
- archives linked
- 0
- exact locators
- 0
- content captures hashed
Governance facts carried by the record
- Operator
- Tokyo Metropolitan Government
- Actor types
- city-government
- Funding model
- public
- Funding description
- Not recorded
- Cost
- Not recorded
- Ownership
- Not recorded
- Decision rights
- Not recorded
- Exit conditions
- Not recorded
3 source dossiers
Tokyo Metropolitan Government (official)
- Stable source ID
src-e8ec9a5b502fcaa0- Publisher
- Name not classified · english.metro.tokyo.lg.jp
- Type / language
- web-page · language not classified
- Published
- Not recorded
- Updated
- Not recorded
- Source last checked
- No source-level check date
- Record last verified
- 2026-08-26
- Dossier created
- 2026-08-27
- Retrieved copy
- No local capture recorded
- Archive
- No archived copy linked
- Content hash
- No captured content hash
- Locator
- Descriptive only — not page/paragraph exact
Open the recorded source note
TMG explainer on the Digital Twin project and the 3D Viewer, including the publication of Noto Peninsula earthquake damage data on the same viewer. Continuously maintained, so it carries no publication date.
TMG Digital Twin roadmap (official)
- Stable source ID
src-7cff033d82c301bd- Publisher
- Name not classified · info.tokyo-digitaltwin.metro.tokyo.lg.jp
- Type / language
- pdf · language not classified
- Published
- Not recorded
- Updated
- Not recorded
- Source last checked
- No source-level check date
- Record last verified
- 2026-08-26
- Dossier created
- 2026-08-27
- Retrieved copy
- No local capture recorded
- Archive
- No archived copy linked
- Content hash
- No captured content hash
- Locator
- Descriptive only — not page/paragraph exact
Open the recorded source note
Official roadmap for social implementation of the digital twin. The PDF carries no readable publication date, so none is recorded. The page states no publication date.
- Claims linked
- Background source; no baseline claim points here
GIGAZINE (press)
- Stable source ID
src-eec7c41707658190- Publisher
- Name not classified · gigazine.net
- Type / language
- web-page · language not classified
- Published
- 2024-12-27
- Updated
- Not recorded
- Source last checked
- No source-level check date
- Record last verified
- 2026-08-26
- Dossier created
- 2026-08-27
- Retrieved copy
- No local capture recorded
- Archive
- No archived copy linked
- Content hash
- No captured content hash
- Locator
- Descriptive only — not page/paragraph exact
Open the recorded source note
Dec 2024 release of free 23-ward 3D Viewer and open point-cloud data.
Known limits of this passport
- Publisher names and source languages have not yet been classified; domains are recorded without guessing.
- Existing source notes are descriptive locators, not page- or paragraph-exact citations.
- A missing archive, publication date or content hash is shown as null rather than inferred.
- The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim.
Continue exploring
Compare this project
Four digital twins: who may open them — and what are they for?
The same label covers a sealed national security asset, a browser tab anyone can open, a bookable simulation lab and a live operations dashboard. Access is the axis that separates them — and it decides what each twin can honestly claim to do.
| Project | Since | Status | Outcome | Evidence | Run by | Cost | Who gets in |
|---|---|---|---|---|---|---|---|
| Virtual Singapore: National 3D City Model and Digital TwinSingapore, 🇸🇬 | 2014 | Completed | Scaled back | Official | National government, Private company | About S$73 million (~US$53 million), as reported by Reuters; the former NRF programme page is offline. | Sealed: rolled out to agencies behind 'internet separation'; the promised public access never launched. |
| Tokyo Digital TwinTokyo, 🇯🇵 | 2021 | Live | Ongoing | Official | City government | not public | Open to anyone: a free browser viewer, with ward point clouds released as open data in December 2024. |
| S-Map — Seoul 3D Digital Twin PlatformSeoul, 🇰🇷 | 2021 | Live | Ongoing | Official | City government | not public | The lab in between: agencies and companies run simulations on roughly 600,000 buildings through its Open Lab. |
| One Network Unified Management (city operations digital twin)Shanghai, 🇨🇳 | 2019 | Live | Ongoing | Peer-reviewed | City government | not public | The operations pole: a live twin coordinating transport and emergency response rather than planning studies. |
Explore the wider context
📎 Cite this project
1001 Smart Cities (2026). “Tokyo Digital Twin” — Tokyo, Japan. The Smart City Atlas. https://1001smartcities.org/projects/tokyo-digital-twin/ (last verified 2026-08-26). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.