1001 Smart Cities

Permanent project revision

Tokyo Digital Twin

Revision 2026-08-26-p1-quality-uplift · effective 2026-08-26

Superseded. A later revision exists: 2026-08-27-source-dating →

unreviewed

Created the first structured Evidence Passport with 6 claims and 3 source dossiers.

sha256:0f31f24b6dfcb309d2716a0f19fa867310627dcb7660c3cff12e4def1bb57879
All revisions → Current entity page →

Change set

  • add /evidencePassport — Added claim-level evidence mapping and source dossiers.
  • add /revisionHistory — Established a permanent, hash-addressed baseline revision.
6
of 6 claims mapped
3
source dossiers
1
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Claims, one by one

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.

Claim 1 clm-df0e0f424e12dc73 quantitative
Its free, browser-based 3D Viewer (built on TerriaJS/Cesium) visualises buildings, roads and terrain across Tokyo's 23 wards
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Press report: the Tokyo Digital Twin 3D Viewer was developed on TerriaJS and lets users visualise 3D and 4D geographic information using only a web browser, covering the 23 wards for free. The TMG page lists the underlying data — 3D digital maps of buildings, roads and sidewalks, plus laser-survey point cloud for terrain.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. GIGAZINE (press)
  2. Tokyo Metropolitan Government (official)
Claim 2 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
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Press report of 27 December 2024, quoting the project: the point cloud data of the wards has been made open data and contains the most accurate publicly available data in Japan.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. GIGAZINE (press)
Claim 3 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
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Press report quoting the project's own announcement of the open point cloud release.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. GIGAZINE (press)
Claim 4 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
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
TMG explainer: to support recovery efforts following the Noto Peninsula earthquake of 1 January 2024, the metropolitan government published damage assessment data — slope collapses, surface cracks and 3D point cloud data — on its Digital Twin 3D Viewer, allowing detailed comparisons between pre- and post-disaster states.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Tokyo Metropolitan Government (official)
Claim 5 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
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The TMG's own explainer gives the Noto earthquake damage assessment as its worked example of the viewer in use.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Tokyo Metropolitan Government (official)
Claim 6 clm-c462940f44f48c16 descriptive
The viewer itself is still labelled a beta version
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Press report of December 2024 naming the product 'Tokyo Digital Twin 3D Viewer (beta version)'.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. GIGAZINE (press)

Source dossiers and revision state

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.

unreviewed Revision 2026-08-26-p1-quality-uplift effective 2026-08-26 · created 2026-08-26

Awaiting operator and domain-expert review; publication of this revision implies neither.

Erratum on this revision's envelope. The snapshot, its hash and its permanent link are untouched.

  • createdAt previously read 2026-08-27T03:00:00Z. The batching script that produced this revision advanced createdAt into the future to satisfy the strictly-increasing order the validator requires per entity. The value never recorded a real event; the corrected value is the moment the revision provably existed in the repository. Corrected to 2026-08-26T14:54:36Z on 2026-08-27; evidence: first appears in commit a70cba917d, committed 2026-08-26T14:54:36Z.
sha256:0f31f24b6dfcb309d2716a0f19fa867310627dcb7660c3cff12e4def1bb57879
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
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) english.metro.tokyo.lg.jp · 3 linked claims

Open original source ↗

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
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.

Descriptive only — not page/paragraph exact
Claims linked
TMG Digital Twin roadmap (official) info.tokyo-digitaltwin.metro.tokyo.lg.jp · background

Open original source ↗

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
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.

Descriptive only — not page/paragraph exact
Claims linked
Background source; no baseline claim points here
GIGAZINE (press) gigazine.net · 4 linked claims

Open original source ↗

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
Open the recorded source note

Dec 2024 release of free 23-ward 3D Viewer and open point-cloud data.

Descriptive only — not page/paragraph exact
Claims linked
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.