Adelaide's Fight Against Duplicate Images Online: How It Stacks Up Against Rotterdam, Toronto and Osaka

Adelaide's Office of the Chief Digital Officer has been quietly working through a backlog of duplicate and outdated imagery embedded across state government platforms, a problem that civic technology researchers say is common to mid-sized cities that rapidly expanded their digital infrastructure during the COVID-19 pandemic. The scale of the issue became harder to ignore this year, when audits of the SA Planning Portal identified hundreds of duplicated site photographs attached to development applications in suburbs from Prospect to Noarlunga Centre — in some cases, the same stock image appearing across dozens of unrelated properties.

The timing matters because Adelaide is positioning itself as a serious smart-city competitor, particularly around Lot Fourteen on North Terrace, where the Australian Space Agency and a cluster of defence and technology firms have established operations. Outdated or duplicated imagery in public-facing systems — development portals, property databases, tourism directories — undermines that pitch to interstate and international investors at exactly the moment the SA Labor government is trying to convert defence and AUKUS-related interest into long-term economic settlement.

What Adelaide Is Actually Doing

The state government's approach centres on two programs. The first is a deduplication sweep running through the Planning and Design Code's image libraries, which are maintained by the Department for Housing and Urban Development. The second is a broader digital-asset audit tied to the Lot Fourteen Digital Economy Strategy, which the government released in late 2024 and which set a target of rationalising more than 40,000 government-held digital assets by the end of the 2025-26 financial year — a deadline that falls this month. Both programs rely partly on automated hashing tools to identify pixel-identical or near-identical images, and partly on manual review by contracted archivists based at the State Library of South Australia on North Terrace.

By comparison, Rotterdam — a port city of roughly 650,000 people that shares Adelaide's industrial-transition story — completed a city-wide image deduplication project across its municipal planning database in 2023, removing approximately 38,000 redundant files and cutting storage costs by an estimated 22 percent, according to figures published by the City of Rotterdam's digital services directorate. Toronto's open-data team published a methodology paper in March 2025 describing a machine-learning pipeline that processed its entire civic image repository in six weeks. Osaka, preparing for Expo 2025, contracted a private consortium to audit visual assets across 14 city departments in under four months.

Adelaide's timeline has been slower. The deduplication work on the Planning Portal began in October 2024, and as of the most recent departmental update in May 2026, the sweep of development-application imagery was described as ongoing. The State Library's contracted archivists are understood to be working through physical-to-digital conversion backlogs that compound the duplicate problem — images scanned multiple times from different collections, then uploaded without cross-referencing.

Why the Gap Exists, and What Comes Next

The core structural difference between Adelaide and faster-moving cities like Toronto or Rotterdam is resource concentration. Toronto's open-data team that handled its image audit employed 23 dedicated staff as of its March 2025 methodology paper. Adelaide's equivalent function is distributed across at least four agencies — the Digital Office, Housing and Urban Development, the State Records Authority of South Australia, and Lot Fourteen's own data governance team — without a single coordinating body owning the problem end-to-end.

For residents and businesses using the SA Planning Portal at planning.sa.gov.au, the practical consequence is occasional confusion when a development application carries photographs that belong to a different address entirely, or when heritage listings in areas like the Parkside and Unley heritage zones display images from incompatible eras. Property lawyers working in the CBD have noted the issue in correspondence with the Law Society of South Australia, though the Society has not made a formal public statement on the matter.

The most useful near-term step for anyone lodging a development application or accessing government image records is to cross-check any imagery against the Lands Title Office's certificate-of-title documentation, which carries its own photo timestamps. The Digital Office has indicated it expects the Planning Portal audit to reach completion before the end of the 2026 calendar year, which would bring Adelaide broadly in line with where Rotterdam was three years ago — not a flattering comparison, but a recoverable one if the consolidation of oversight into a single digital-assets authority follows.