Canberra's Duplicate Image Problem: How the Capital Stacks Up Against Cities Tackling the Same Headache

The ACT government's digital records directorate is working through a backlog of duplicate image files across its land and planning databases — a problem that sounds mundane until you consider that redundant files are inflating storage costs, slowing down public-facing property portals, and in some cases serving outdated building images to prospective buyers and renters in suburbs like Gungahlin and Belconnen where construction turnover is high.

The issue has sharpened in 2026 partly because of scale. The ACT Planning portal, which went through a major redevelopment in 2024, inherited image libraries from legacy systems that had never been deduplicated. Rapid residential development across the Molonglo Valley and the ongoing infill densification around Dickson and Mitchell have added thousands of new property records in the past two years alone, each requiring verified, current imagery. When duplicate or superseded photos persist in the system, the downstream effects range from minor confusion to genuine compliance questions for real estate agents operating under ACT Fair Trading obligations.

What Other Cities Are Doing

Singapore's Urban Redevelopment Authority has been running automated image deduplication across its OneMap platform since late 2023, using perceptual hashing — a technique that identifies visually similar images even when file names or metadata differ. The result, according to URA's published digital infrastructure reports, was a reduction in redundant image storage across its geospatial databases. Wellington City Council in New Zealand embedded similar tooling into its Objective ECM document management system during a 2024-25 upgrade cycle, a process that its IT team documented in a publicly available procurement notice.

Amsterdam's approach has been more decentralised. The city's Gemeentearchief — its municipal archive — relies on library staff to flag duplicates during periodic audits rather than automating the process. It's slower, but archivists there have argued the human review catches contextually important distinctions that algorithms miss, such as images that look identical but were captured at different points in a building's heritage assessment.

Canberra sits somewhere between Singapore's automation-first model and Amsterdam's human-review approach. The Australian National University's research computing team at the Acton campus has developed open-source deduplication tools used by some ACT government units, though uptake across agencies has been uneven. The Australian Institute of Health and Welfare on Bowes Street in Phillip — one of the capital's major data-handling institutions — uses a commercial deduplication pipeline for its health imagery archives, a model that smaller ACT directorates have looked at but not yet adopted.

The Local Cost Equation

Storage is not free. Cloud hosting for government image archives in the ACT is procured under whole-of-government arrangements, but agencies that exceed their allocated storage tiers face additional costs billed quarterly. With the ACT public service already under budget pressure heading into the 2026-27 budget cycle — the territory's mid-year fiscal update flagged ongoing expenditure constraints — even incremental savings from cleaner image libraries matter to Chief Digital Officers trying to find efficiencies without cutting headcount.

A government data management framework released in March 2026 flagged duplicate asset management as a priority area for the current financial year, though it stopped short of mandating specific technical solutions. That discretion has meant different directorates are solving the same problem in different ways, which itself creates inconsistency in how Canberrans experience government digital services.

For residents, the practical stakes are clearest in the property market. Anyone who has used the ACT's online planning map to look up a house in Fraser or a unit block in Braddon will have encountered the occasional stale or mismatched property photo. It's an irritation rather than a crisis, but in a city where median apartment prices have held above $550,000 through the first half of 2026 and public servants are making major financial decisions based partly on digital information, accuracy matters.

The most likely near-term development is a territory-wide standard — essentially a technical specification for image file management — that the ACT Digital Strategy office has been drafting in consultation with directorates since early this year. If that standard is published before the end of 2026, it would put Canberra ahead of most comparable-sized cities globally in having a codified policy, even if the execution still lags the automation leaders in Singapore and Wellington.