Delhi's Heritage Archives Are Full of Duplicate Scans. Officials and Experts Are Finally Arguing About What to Do.

Delhi's digital archiving effort, which began in earnest under a 2019 Municipal Corporation of Delhi initiative to digitise property records, land maps, and heritage site documentation, is sitting on a growing problem: tens of thousands of duplicate image files are clogging government servers, slowing public access portals, and making it harder for researchers and officials alike to find reliable records. The issue came into sharper focus this week after a working group convened by the Delhi Archives, located on Shamnath Marg in Civil Lines, circulated an internal assessment noting that duplicate imagery across heritage documentation alone runs into an estimated 40,000 files.

The timing is not coincidental. Delhi Metro Rail Corporation's Phase 4 expansion has triggered fresh rounds of archaeological survey work at corridor sites cutting through areas like Janakpuri and Tughlaqabad, generating thousands of new site photographs weekly. When those images enter existing government repositories without a deduplication protocol in place, archivists say, the problem compounds itself fast.

What Officials and Technical Experts Are Saying

The Delhi Archives directorate, which formally operates under the state government, has described the situation as a storage and retrieval challenge requiring a dedicated software-based solution rather than manual review. The directorate has reportedly been in discussion since early 2025 with the National Informatics Centre, the federal IT agency that manages backend infrastructure for multiple Delhi government portals, about integrating image-hash deduplication tools into the existing document management system. No implementation date has been confirmed publicly.

Heritage conservationists working with the Indian National Trust for Art and Cultural Heritage, whose Delhi chapter is headquartered near Lodhi Road, have been more pointed in their assessment. The core concern from that community is not storage space but archival integrity: when a digitised photograph of, say, a Mughal-era stepwell in Mehrauli appears under three different file names with slightly different metadata, determining which version carries the authoritative caption and survey date becomes genuinely difficult. That ambiguity can compromise research citations and, in some cases, legal property documentation.

Civic technology advocates connected to Delhi's open-data ecosystem have argued for a different approach entirely. Rather than deploying deduplication at the server level after files are uploaded, they contend the fix should happen at the point of ingestion, requiring field surveyors and government photographers to use standardised naming conventions and checksum verification before files enter any repository. This is the model adopted by the Archaeological Survey of India for its own centralised database, though ASI and state-level archives operate on separate systems and do not currently share a unified portal.

The Practical Costs Are Real

Storage is not free. Delhi government cloud hosting contracts, managed through NIC's data centres, charge agencies for capacity consumed. An analysis by independent civic technology group DataMeet's Delhi chapter, presented at a January 2026 open-data workshop at India Habitat Centre in Lodhi Estate, estimated that unmanaged duplication across three major Delhi government document portals was consuming storage equivalent to roughly 18 months of new legitimate uploads. That figure was based on a sample audit, not a full system scan, but it was the most specific public estimate on record going into this week's discussions.

The AAP-led state government has pointed to the broader Smart Cities Mission framework as the appropriate funding vehicle for fixing the underlying infrastructure, while critics note that Delhi was dropped from the Smart Cities Mission shortlist in 2023, leaving some planned digital governance upgrades without central funding.

For residents trying to access digitised property records through the Delhi government's e-District portal, the practical effect of the duplicate-image problem is occasional retrieval failures and mismatched document images when pulling up older survey files. The Revenue Department has acknowledged on its official FAQ page that users encountering mismatched records should visit their nearest tehsildar office, of which the Sadar Bazar tehsil office near Paharganj handles some of the highest walk-in volumes in the city.

The working group is expected to submit a formal recommendation to the Chief Secretary's office before the end of July 2026. Whether a vendor contract for deduplication software follows quickly, or the proposal enters a longer procurement cycle, will determine how soon the backlog gets cleared, and how much deeper it grows in the meantime.