Delhi's Duplicate Image Problem: How the Capital Compares to Cities Fixing Their Visual Clutter

Delhi's municipal and state agencies are sitting on a growing backlog of duplicate images — identical or near-identical photographs embedded across official portals, civic grievance apps, and heritage documentation databases — and the problem is now drawing scrutiny from urban information management specialists who point out that the capital is lagging behind comparable megacities in cleaning up its visual records infrastructure.

The issue matters right now for a specific reason. Delhi's Phase 4 Metro expansion, which is pushing new station construction through corridors including Janakpuri West and RK Ashram Marg, has generated tens of thousands of construction-progress photographs since 2023. Multiple agencies — the Delhi Metro Rail Corporation, the Public Works Department, and the Delhi government's Urban Development directorate — have been independently logging photographic records of the same sites, with no shared deduplication protocol in place. The result is redundant storage, slower public portal loading times, and confusion for contractors and auditors cross-referencing project documentation.

The Delhi Development Authority's GIS and mapping cell, based out of its Vikas Sadan headquarters near INA, acknowledged the duplication problem in internal documentation circulated to ward-level officials earlier this year, though no public-facing correction programme has been announced. Separately, the Unified Traffic Management Centre in Sarita Vihar, which aggregates CCTV and traffic-camera feeds from across the city, has been working since late 2024 to implement hash-based image fingerprinting to flag duplicate frames before they are archived — a relatively low-cost technical fix that has not yet been extended to other city departments.

What Other Cities Are Doing

The contrast with Seoul is instructive. South Korea's capital completed a citywide deduplication audit of its Smart Seoul Data of Things platform in March 2025, removing more than 2.3 million redundant image files from its open-data repository and reducing storage overhead by roughly 18 percent, according to the Seoul Digital Foundation's published annual report. The exercise also made Seoul's public heritage image archive — particularly photographs of the Cheonggyecheon stream restoration — significantly faster to search and licence for reuse.

São Paulo ran a comparable exercise through its Secretaria Municipal de Inovação e Tecnologia in 2024, targeting duplicated imagery in the city's favela-mapping programme. Officials there used open-source perceptual hashing tools that are freely available and could, in principle, be adopted by Delhi's agencies without significant procurement cost. Nairobi's city government partnered with a Kenyan civic-tech nonprofit in 2025 to clean up duplicated images in its informal-settlement survey database, an exercise that took four months and cost the equivalent of roughly ₹85 lakh — a figure often cited in South Asian urban governance circles as evidence that deduplication does not require a large budget.

Delhi's own civic tech ecosystem is not starting from zero. The Aam Aadmi Party government's 311-style complaint platform, launched under the Delhi government's e-governance push, processes thousands of citizen-uploaded photographs daily from neighbourhoods including Lajpat Nagar, Rohini, and Dwarka. Platform engineers have reportedly flagged duplicate submission imagery as a recurring data-quality concern since at least 2022, though no publicly available audit quantifying the scale of the problem has been released.

What Needs to Happen Next

Urban data specialists who work with South Asian municipalities generally recommend a three-step approach: first, a time-bounded audit of all image-heavy databases maintained by city agencies; second, adoption of perceptual hash deduplication at the point of upload rather than retrospectively; and third, a shared image registry across departments so that a photograph taken by one agency is discoverable before another agency shoots and stores the same subject independently.

For ordinary Delhiites, the practical consequence of fixing this is modest but real — faster-loading government portals, more accurate Right to Information responses that do not return the same photograph dozens of times, and cleaner documentation for heritage sites in Old Delhi's Shahjahanabad precinct, where conservation records are among the most photographically duplicated in the city's archives. The technical tools exist. The question is whether the city's fragmented departmental structure will allow them to be deployed at scale before the next audit cycle begins.