Delhi's Duplicate Image Problem: The Key Decisions That Will Shape the City's Digital Records

Delhi's civic and heritage agencies are facing a reckoning over thousands of duplicate digital images clogging government servers, slowing down public record systems, and undermining the accuracy of everything from urban planning databases to the Archaeological Survey of India's documentation of Old Delhi monuments. The problem has been building for years. The decisions made in the next six to twelve months will determine whether the city's digital infrastructure keeps pace with its physical expansion — or falls further behind.

The issue matters now because Delhi Metro Rail Corporation is in the thick of Phase 4 construction, with corridor work advancing along the Janakpuri West–R.K. Ashram Marg line and the Aerocity–Tughlakabad stretch. Engineering and survey teams generate thousands of site photographs weekly. When those images are ingested into shared project management systems without deduplication protocols, file sizes balloon, version control breaks down, and the risk of planners working from outdated or misidentified visuals increases sharply. The same problem afflicts the Delhi Urban Shelter Improvement Board, which photographs informal settlements for resettlement documentation, and the Delhi Heritage Conservation Committee, which maintains visual records of listed structures across Chandni Chowk and Ballimaran.

Where the Backlog Is Worst

Three areas of the city have emerged as the most acute pressure points. The lanes around Jama Masjid in Shahjahanabad, where heritage documentation projects have been running intermittently since at least 2018, have accumulated overlapping image sets from multiple agencies — the Delhi Tourism and Transportation Development Corporation, the Archaeological Survey of India's Delhi Circle, and the Municipal Corporation of Delhi's heritage cell — with no single authority responsible for maintaining a deduplicated master archive. Photographers sent by different departments on different days routinely capture the same facade, the same doorway, the same carved bracket, filing images under different nomenclature into different servers.

The second pressure point is along the Yamuna floodplain between the Signature Bridge and the Wazirabad Barrage, where monitoring teams photograph encroachments and river-edge conditions as part of the National Green Tribunal-mandated cleanup compliance process. Satellite and ground-level images here can overlap with National Remote Sensing Centre datasets, creating redundancy that delays the quarterly compliance reports submitted to the NGT.

The third is the India Gate–Central Vista corridor, where the Central Public Works Department and the New Delhi Municipal Council both run independent photographic surveys. Digital storage costs are not trivial: cloud archiving for large unstructured image libraries can run between ₹4 and ₹12 per gigabyte per month depending on the tier, and agencies with unchecked duplicate accumulation can see storage bills climb by 30 to 40 percent year-on-year without any corresponding increase in usable data.

What Happens Next

The immediate decision before Delhi's agencies is whether to run automated deduplication tools — software that flags perceptually similar images using hash-matching or AI-based comparison — before the next budget cycle closes in March 2027, or to wait for a unified data governance policy that the Ministry of Housing and Urban Affairs has been drafting as part of the Smart Cities Mission's legacy transition framework. Waiting carries real costs. Running deduplication independently carries the risk of agencies deleting images that another department was relying on.

The Delhi Metro Rail Corporation, which operates under central government oversight, is better positioned than most to move first. Its IT systems were substantially upgraded during Phase 3 and it has existing vendor relationships with data management firms. If DMRC establishes a working deduplication protocol by the end of 2026, other agencies — including the MCD and the Delhi Development Authority — would have a functional template to follow.

For heritage documentation specifically, the most practical path forward involves the Archaeological Survey of India's Delhi Circle and the Delhi Urban Heritage Foundation agreeing on a single image repository with standardised tagging, ideally hosted on the National Informatics Centre's infrastructure rather than fragmented across departmental servers. That conversation, sources familiar with the sector say, has been discussed in NIC working groups but has not yet produced a binding agreement.

The decisions are not glamorous. They involve procurement approvals, interdepartmental memoranda, and IT tenders. But for a city adding population, infrastructure, and digital records simultaneously, getting the image management question right now will matter considerably more than it might appear.