How Melbourne Is Tackling Duplicate Image Sprawl — And Where It Stands Against London, Amsterdam and Seoul

Melbourne's state and local governments are sitting on hundreds of thousands of duplicate aerial, streetscape and archival images spread across at least a dozen separate civic databases, and the effort to clean that up is now a live question in infrastructure and digital governance circles. The problem is neither glamorous nor new, but the cost of ignoring it — in storage, in retrieval time, and in planning errors caused by outdated or duplicated visual records — is drawing attention from the same quarters pushing the city's broader digital transformation agenda.

The timing matters. Victoria's land-use planning system is in the middle of its most significant density reform push in a generation, with the state government's housing overhaul centring on activity corridors from Brunswick to Frankston. Accurate, deduplicated imagery underpins heritage assessments, planning permit applications and infrastructure mapping. When duplicate images exist — sometimes dozens of near-identical captures of the same Fitzroy terrace or Docklands tower — the downstream risk is that planners, developers and council officers are working from inconsistent visual baselines.

What Melbourne Is Actually Doing

The City of Melbourne's Spatial Data Team, which operates out of Council House 2 on Little Collins Street, has been running an internal image deduplication audit since late 2024. The project covers civic photography, planning imagery and digitised heritage collections held in partnership with the Public Record Office Victoria at the North Melbourne repository on Wreckyn Street. The State Library of Victoria's Pictorial Collection — one of the largest municipal visual archives in the Southern Hemisphere — is also part of broader discussions about standardising deduplication protocols across government-held repositories.

Industry practitioners in Melbourne point to the National Library of Australia's Trove platform as one of the more mature Australian examples of automated duplicate detection applied to digitised imagery at scale. Trove's image deduplication work, which accelerated after a 2022 platform overhaul, uses perceptual hashing — a technique that generates a compact fingerprint for each image and flags near-identical matches — rather than pixel-by-pixel comparison. Melbourne's municipal systems have been slower to adopt similar automated tooling, relying more heavily on manual curation workflows that are labour-intensive and inconsistent across departments.

The Global Comparison

Other cities present a mixed picture. Amsterdam's municipal archive, Stadsarchief Amsterdam, completed a deduplication project across its 750,000-image historical collection in 2023, deploying open-source tools built on the ImageHash Python library. The project reduced retrievable duplicates by roughly 34 percent, according to reporting by the Dutch tech publication Computable at the time of completion. London's Wellcome Collection and the Greater London Authority's mapping division have both moved toward automated deduplication as part of wider GDPR-compliance data minimisation obligations — a regulatory driver that does not apply in the same form in Australia.

Seoul's Smart City Division, operating under the Seoul Digital Foundation, has integrated deduplication checks directly into its real-time urban sensing pipeline, meaning drone and CCTV-sourced imagery is screened for redundancy before it even enters permanent storage. That upstream approach is considered best practice by urban data researchers, and it is not yet replicated in Melbourne or any other Australian capital.

Sydney, by comparison, has invested heavily in LiDAR-based mapping through NSW Spatial Services but has faced its own backlog in rationalising older photographic archives, particularly those inherited from discontinued programs at various state agencies.

For Melbourne, the practical next step is a proposed cross-agency framework being developed through the Victorian Centre for Data Insights, which sits within the Department of Government Services. If the framework progresses to a pilot, it would likely target the City of Port Phillip and the inner-north councils first, given the high volume of planning permit imagery generated in those areas over the past decade. No public timeline has been confirmed. Property researchers, heritage consultants and planning lawyers operating along corridors like Smith Street in Collingwood or Sydney Road in Coburg would have the most direct day-to-day stake in whether that framework ever gets off the ground.