Canberra's Duplicate Image Problem: How the Capital Stacks Up Against Cities Fighting Digital Archive Bloat

The ACT Government's Land Development Agency holds tens of thousands of aerial and streetscape photographs accumulated over more than two decades of urban expansion across Gungahlin, Belconnen and the Molonglo Valley. A growing proportion of those files are duplicates — identical or near-identical images stored multiple times across separate server environments, quietly inflating storage costs and slowing retrieval for planners and emergency services alike.

The problem is not unique to Canberra, but the city's particular makeup — a large, document-heavy federal and territory public service, two major universities generating research imagery, and a planning bureaucracy that photographs every development application site — means the scale here is proportionally larger than in comparably sized cities. The question of how to fix it has become a live budget and procurement conversation inside several ACT directorates this year.

What Other Cities Are Doing

Wellington, New Zealand — a capital city of similar population and public-service concentration — moved in 2024 to implement a centralised deduplication protocol across its council's geographic information systems. The Wellington City Council's GIS unit consolidated storage under a single vendor contract and reduced its image library footprint by roughly 34 percent within eighteen months, according to a procurement summary published by the New Zealand Government's digital services office. Edinburgh's City Council adopted a comparable approach through its Smart City Programme, mandating that all planning imagery pass through a hash-based deduplication filter before ingestion into the primary archive.

Singapore's Urban Redevelopment Authority has gone furthest, integrating machine-learning tools into its document management pipeline since 2023, automatically flagging near-duplicate images — photographs taken seconds apart from the same device, for instance — for human review before storage is committed. The authority reported at a 2025 Asia-Pacific urban data conference that the system had cut new duplicate creation by more than 60 percent in its first year of operation.

Canberra, by contrast, is still in a fragmented, directorate-by-directorate phase. The Australian National University's Scholarly Information Services team has been running its own deduplication project across the university's digital collections since early 2025, working through the ANU Library's Nolan Collection and research data repositories on Acton Peninsula. That project is self-contained and does not interface with ACT Government systems. The University of Canberra, based at Bruce, has a separate digital asset management policy under its library services division, again operating independently.

The Cost of Doing Nothing

Cloud storage is not free, and the ACT Government's whole-of-government technology contracts — managed through the Shared Services ICT division, which sits within the Chief Minister, Treasury and Economic Development Directorate — are renegotiated on multi-year cycles. The next major renewal window opens in mid-2027. Without a deduplication standard locked in before that date, agencies risk rolling over contracts that price storage capacity they would not need if archives were properly rationalised.

Independent analysis of comparable Australian government jurisdictions suggests that unmanaged duplicate image accumulation can inflate a digital archive's effective storage requirement by 20 to 40 percent over a ten-year period, though the ACT Government has not publicly released its own audit figures. The City of Hobart, which completed a digital archive review in late 2025, found that nearly 28 percent of its planning imagery store consisted of duplicates, some held in as many as four separate locations on the same network.

For Canberra residents, the practical consequences show up in service delays — a planning officer pulling streetscape records for a development on Northbourne Avenue or Marcus Clarke Street may retrieve multiple conflicting versions of the same image, requiring manual reconciliation before a decision can proceed.

The immediate next step, according to ACT Government tender documents published on the buy.act.gov.au procurement portal earlier this year, is a scoping study for a whole-of-government digital asset management framework, with responses due in the third quarter of 2026. Whether that study recommends a Wellington-style centralised approach, Singapore's automated filtering model, or something built around existing ACT infrastructure will depend heavily on the findings. Agencies and contractors with submissions pending should expect the government to look hard at what Edinburgh and Wellington spent — and what they saved — before committing to any single path.