Singapore Leads Asia in Purging Duplicate Images from Public Records — But the Work Is Far From Done

Singapore's Urban Redevelopment Authority confirmed earlier this year that its online property portal had accumulated tens of thousands of duplicate listing images over a decade of digitisation, straining server infrastructure and returning cluttered search results to users hunting for flats along Tampines Street or shophouses in Tanjong Pagar. The problem is not unique to Singapore, but the city-state's response — and the speed of it — is drawing scrutiny from urban planners and civic tech researchers in cities from Seoul to Amsterdam.

Duplicate image replacement sits at an unglamorous intersection of data hygiene and public trust. When a citizen searches the HDB Resale Portal for a three-room flat in Queenstown and encounters four identical photographs filed under different listing IDs, the practical cost is wasted time. The institutional cost is harder to quantify but arguably larger: eroded confidence in the accuracy of government digital services at a moment when Singapore is betting heavily on its reputation as a reliable AI and smart-city hub.

What Singapore Is Actually Doing

The Infocomm Media Development Authority (IMDA), working under the broader Digital Government Blueprint framework, began piloting automated image-deduplication tools across selected government databases in the second quarter of 2025. The pilot targeted the OneMap platform — the national mapping service run by the Singapore Land Authority — as well as the National Heritage Board's digital archive on Armenian Street, which houses hundreds of thousands of heritage photographs, many of them scanned multiple times from the same physical prints during successive digitisation rounds.

The tools in use apply perceptual hashing — an algorithm that generates a fingerprint for each image based on visual content rather than file metadata — allowing near-identical photographs to be flagged even when saved under different filenames or compression settings. Singapore's approach borrows from work done by the British Library in London, which completed a similar deduplication sweep across its digital newspaper archive in 2024, reducing redundant image files by roughly 18 percent. Singapore's own figures have not been published, but the IMDA pilot is understood to cover several discrete database environments before any government-wide rollout.

The comparison with other Asian cities is instructive. Tokyo's National Diet Library completed a large-scale digital asset review in fiscal year 2024, but its deduplication effort was confined to pre-war photographic collections and did not extend to live-service portals used by the public. Seoul's Smart City Division has prioritised real-time data accuracy in transport feeds over static image archives, reflecting a different set of civic priorities. Hong Kong's Lands Department, operating under a different political climate, has not publicly disclosed a comparable programme.

Why the Stakes Are Higher Here

Singapore's density amplifies the stakes. With roughly 5.9 million residents sharing one of the most document-intensive property markets in the region — where an HDB resale flat in Bishan can transact at above S$1 million and every square foot of listing information matters to buyers — data quality in housing portals is not an abstract concern. Duplicate images can obscure renovation history, conflate units across different floors, or simply exhaust a buyer's patience at a critical decision point.

The problem also touches commercial real estate. The Building and Construction Authority's GoBusiness portal, which landlords and tenants use to navigate licences and compliance documents, has faced similar internal reviews, according to documents tabled at a 2025 parliamentary sitting on digital government readiness. The specific scope of image duplication identified in that review was not disclosed publicly.

For residents, the practical advice is straightforward: cross-reference listing photographs on official portals against site visits and request updated photo sets from agents when images look dated or repetitive. HDB's Resale Flat Listing service allows buyers to flag suspected duplicate or misleading listings directly through the portal's feedback function — a feature that was expanded in January 2026.

The harder work remains on the institutional side. Singapore has the tools, the mandate under the Digital Government Blueprint, and the political will to push deduplication further than most comparable cities. Whether the timeline matches the ambition is the question that IMDA and the Smart Nation Group will need to answer with published data, not just pilot reports.