Sydney's Duplicate Image Problem: How the City Stacks Up Against London, Singapore and New York

Sydney's local government bodies and state agencies are sitting on millions of duplicate digital images — scanned documents, planning photographs, infrastructure records — and the systems meant to catch them are patchy at best. An audit culture that took hold after the 2018 Digital Records Improvement Program pushed agencies to digitise paper archives fast, but the rush left libraries of repeated files clogging servers and slowing down retrieval for planners, lawyers and residents alike.

The issue has come into sharper focus this year as the NSW government accelerates housing approvals across Western Sydney growth corridors, where councils like Cumberland City and the Blacktown City Council process thousands of development applications monthly. When an officer pulls up a DA for a knockdown-rebuild on, say, Merrylands Road and encounters four identical scans of the same stormwater diagram, the administrative delay compounds. Multiply that across tens of thousands of applications and the inefficiency becomes structural.

What Sydney Is Actually Doing About It

The NSW State Archives and Records Authority, based in Kingswood, has been running a deduplication pilot since late 2024 using hashing software that fingerprints each image file. The program targets records held by the Department of Planning, Housing and Infrastructure first, given the volume of digitised material generated by the rezoning push under the Transport Oriented Development program, which designated 37 station precincts for higher density from 2023 onward. Results from the pilot have not been made public, but the program is understood to cover records stored on the GovDC data centres in Silverwater.

The City of Sydney Council, which manages records for the inner-city area stretching from Redfern to Pyrmont, has independently contracted with an Australian software vendor to run automated duplicate detection across its property image database. Council staff described the project in budget papers tabled in June 2025 as part of a broader $4.2 million digital asset management upgrade — one of the few hard figures available in the public record on what this remediation actually costs a major Australian local government body.

By comparison, London's 32 borough councils moved collectively through a GLA-coordinated framework agreement in 2022, giving them access to bulk-licensed deduplication tools at negotiated rates. Singapore's Urban Redevelopment Authority had integrated perceptual hash detection into its OneMap platform by 2021, meaning duplicates are flagged at the point of upload rather than cleaned up retroactively. New York City's Department of Records and Information Services completed a city-wide image deduplication project across its Municipal Archives in 2023, reportedly removing more than 11 million redundant files from a collection of roughly 2.2 million cubic feet of digitised material — a figure the department published in its annual report.

The Gap Between Sydney and Peer Cities

The common thread in London, Singapore and New York is that deduplication was treated as infrastructure policy, not an IT footnote. Sydney — and Australian cities generally — have tended to address it project by project, agency by agency. The result is that Port Botany's trade documentation systems, managed through a separate federal chain involving the Australian Border Force and private terminal operators, run on entirely different image standards to the planning records held at council level in Liverpool or Campbelltown. There is no city-wide or even state-wide protocol mandating a common image format or deduplication checkpoint.

The NSW government's Digital Information Security Policy, updated in February 2024, addresses data integrity broadly but does not set enforceable standards for image deduplication specifically. That gap is what organisations like the Institute of Public Administration Australia's NSW division have flagged in submissions to the state's digital strategy review, though those submissions have not generated binding policy changes as of this month.

For residents and businesses dealing with Sydney councils, the practical upshot is straightforward: if a development application stalls, or a heritage record request takes weeks rather than days, duplicate digital files are often part of the friction. The fix exists — the tools are cheap, well-tested and already deployed in comparable cities. What Sydney lacks is the coordination to apply them uniformly. The state's housing push, which depends heavily on fast, accurate record retrieval, may finally provide the political pressure to close that gap before the next electoral cycle makes everything harder to move.