Perth's Duplicate Image Problem: How the City Stacks Up Against Vancouver, Amsterdam and Singapore

Perth's online property and public-record systems are carrying a measurable burden of duplicate and misplaced images — a problem that costs money, distorts data and, in the case of heritage listings, can mislead planning decisions. The City of Perth and the Western Australian Land Information Authority (Landgate) are both working through remediation programs, but experts and administrators in comparable cities say the window to fix this cheaply is closing fast as AI-driven search tools begin scraping and redistributing bad data at scale.

The issue matters now because three forces are colliding simultaneously in Perth. The Metronet rail expansion is generating hundreds of new precinct visualisations and station renders that are already appearing in duplicate across Transport for WA's project pages and private real-estate portals. The AUKUS-linked development push around HMAS Stirling at Garden Island is flooding defence procurement and environmental-impact databases with repeated aerial imagery. And a housing demand surge driven by interstate and overseas migration has pushed the number of active listings on platforms like REIWA above levels not seen since the mid-2010s boom, compressing the time agents spend checking whether a photograph actually matches the property it is attached to.

What Perth Is Doing — and What It Isn't

Landgate, the state government's spatial data authority based in Midland, runs a deduplication workflow as part of its Shared Location Information Platform (SLIP). The program uses hash-based image matching to flag repeated files across contributing agency datasets, but the tool is not applied automatically to private-sector feeds, which account for the bulk of property imagery in circulation. The City of Perth's heritage office, which maintains records for buildings across the CBD and the inner suburbs stretching from Northbridge to East Perth, relies largely on manual review when volunteers or staff notice a mismatch between a photograph and its listed address.

Compare that with Amsterdam, where the Gemeente Amsterdam's digital city archive completed a full deduplication pass of its property and public-space image library in 2023, using perceptual hashing and machine-learning clustering across roughly 1.4 million files. Vancouver's BC Assessment Authority integrated automated image-validation into its property roll update cycle in 2022, reducing disputed-image complaints from agents and homeowners by a figure the authority described publicly as significant in its 2023 annual report. Singapore's Urban Redevelopment Authority links its image repository directly to its OneMap geospatial platform, so a photograph cannot be saved against a parcel record without a verified coordinate match.

Perth has none of those integrations at a city-wide level. Landgate's SLIP is a strong foundation, but it does not reach the private portals where most buyers and renters form their first impression of a property. The result is that a photograph of a terrace in Highgate can sit confidently beneath the address of a strata unit in Victoria Park for months before anyone flags it.

The Cost and the Coming Pressure

Digital asset management consultants working with WA local governments put the per-record remediation cost — once a duplicate or misattributed image has propagated across multiple databases — at somewhere between $15 and $60 depending on how many downstream systems need updating, though those figures come from internal procurement documents rather than any published benchmark. At scale, across a metro area processing tens of thousands of new and updated listings each quarter, that arithmetic becomes uncomfortable.

The pressure is likely to intensify. The WA state government's 2025-26 budget allocated funding to expand Landgate's digital cadastral capabilities, with a completion milestone set for mid-2027. If that build-out proceeds on schedule, it creates a natural integration point where image-validation rules could be baked into the new cadastral feed before private portals connect to it — the approach Singapore took when it rebuilt OneMap a decade ago.

For now, anyone relying on online images to assess a property in suburbs like Maylands, Belmont or the rapidly redeveloping areas around the new Bayswater Metronet interchange should treat unverified listing photographs with caution. Cross-referencing against the Landgate portal's official title records, and requesting a physical inspection before signing anything, remains the only reliable safeguard until the city catches up with the systems its peers built years ago.