1001 Smart Cities

Permanent project revision

Array of Things

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

Superseded. A later revision exists: 2026-08-27-correction-run →

unreviewed

Created the first structured Evidence Passport with 9 claims and 5 source dossiers.

sha256:3e9204d8997ae02b1e5939bc5991087acf5646b37daf1145289edbffe3cfbb9c
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.
9
of 9 claims mapped
5
source dossiers
3
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-dcb2542bbbecfd27 quantitative
the Array of Things mounted modular sensor nodes on streetlight and traffic-signal poles from 2016, measuring air quality, noise and pedestrian traffic and publishing the readings as open data
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Launch report of 29 August 2016: the first nodes were installed on city streets that week to measure air quality, climate, traffic and other urban features, in a University of Chicago, Argonne and City of Chicago partnership; the trade explainer covers the open-data publication.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. University of Chicago News — launch
  2. GovTech (trade)
Claim 2 clm-d474770f9ed3b09e quantitative
The launch announced 500 nodes across the city by the end of 2018; about 130 were running four years later
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Launch report: a total of 500 nodes will be installed across Chicago by the end of 2018. Four years on, the trade report describes a network of 130 environmental sensors placed around Chicago.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. University of Chicago News — launch
  2. StateScoop (trade)
Claim 3 clm-825d6e5f5e855118 quantitative
A University of Chicago-Argonne partnership retired the original nodes in September 2021 after they outlived their planned lifespan
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Project website: the original AoT nodes were retired in September 2021 after many had been in service for four years, two years beyond their planned lifespans.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Array of Things (project)
Claim 4 clm-1816d44e21092933 descriptive
succeeded by the SAGE software-defined sensor network
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The project owner's page covers the SAGE successor; the trade report describes the upgrade to software-defined nodes that can be given a new measurement by transmitting a new program.
Caveat
The project owner's page is the source of record for the SAGE succession, and its host answers automated retrieval with HTTP 403, so no locating passage is recorded from it.

Sources carrying this claim

  1. Argonne National Laboratory — Array of Things
  2. StateScoop (trade)
Claim 5 clm-e605b46f570bcc62 quantitative
The launch announced a total of 500 nodes across Chicago by the end of 2018
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Launch report of 29 August 2016.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. University of Chicago News — launch
Claim 6 clm-a51375ded8fef728 quantitative
Four years in, in January 2021, the network was about 130 environmental sensors, and a planned expansion to 150 had been derailed by the pandemic
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Trade report of 28 January 2021: a network of 130 environmental sensors placed around Chicago over the last four years, with a plan to expand to 150 the previous year derailed by the COVID-19 pandemic.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. StateScoop (trade)
Claim 7 clm-4d67e4a6f178515c descriptive
the original nodes were retired that September, after many had run four years, two beyond their planned lifespan
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Project website's retirement statement.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Array of Things (project)
Claim 8 clm-28486444f9b73b63 quantitative
Chicago announced 500 nodes and ran about 130
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Launch report and the four-year status report side by side.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. University of Chicago News — launch
  2. StateScoop (trade)
Claim 9 clm-0a7e0752e7b7fac8 descriptive
SAGE, whose sensors can be given a new measurement by sending them a new program instead of putting up a new device
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Trade report: the new nodes use software-defined networking, allowing the team to transmit a new program to the sensors rather than having to put up a new device to take a new type of measurement.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. StateScoop (trade)

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 2026-08-27T04:00:00Z. 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.
sha256:3e9204d8997ae02b1e5939bc5991087acf5646b37daf1145289edbffe3cfbb9c
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
9
of 9 claims mapped
5
source dossiers
3
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
University of Chicago & Argonne National Laboratory
Actor types
research
Funding model
Not recorded
Funding description
Not recorded
Cost
Not recorded
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

5 source dossiers

Array of Things (project) arrayofthings.github.io · 2 linked claims

Open original source ↗

Stable source ID
src-f01c8b65458dfdd4
Publisher
Name not classified · arrayofthings.github.io
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

Official project website. Carries the retirement statement: the original nodes were retired in September 2021 after many had been in service for four years, two beyond their planned lifespans. Continuously maintained, so it carries no publication date.

Descriptive only — not page/paragraph exact
Claims linked
Argonne National Laboratory — Array of Things anl.gov · 1 linked claim

Open original source ↗

Stable source ID
src-ab26ab5c1ef95ea9
Publisher
Name not classified · anl.gov
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

Project owner page: node history, retirement and the SAGE successor. The host answers automated retrieval with HTTP 403, so no publication date is recorded.

Descriptive only — not page/paragraph exact
Claims linked
University of Chicago News — launch news.uchicago.edu · 4 linked claims

Open original source ↗

Stable source ID
src-9662fcfef8142fc6
Publisher
Name not classified · news.uchicago.edu
Type / language
web-page · language not classified
Published
2016-08-29
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

Launch report, 29 August 2016: the first of an eventual 500 nodes, with a total of 500 to be installed across Chicago by the end of 2018.

Descriptive only — not page/paragraph exact
Claims linked
StateScoop (trade) statescoop.com · 5 linked claims

Open original source ↗

Stable source ID
src-e2cc310e81693bfd
Publisher
Name not classified · statescoop.com
Type / language
web-page · language not classified
Published
2021-01-28
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

Status four years in, 28 January 2021: a network of 130 environmental sensors, with a planned expansion to 150 derailed by the pandemic, and an upgrade to software-defined nodes.

Descriptive only — not page/paragraph exact
Claims linked
GovTech (trade) govtech.com · 1 linked claim

Open original source ↗

Stable source ID
src-c1ba96d832dc2c75
Publisher
Name not classified · govtech.com
Type / language
web-page · language not classified
Published
2018-01-03
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

Industry publication reporting on the project.

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.