Mumbai Officials Confront Ghost Images Clogging Digital Archives

Mumbai's municipal and state government databases are carrying thousands of duplicate, corrupted, or mismatched images, embedded in everything from Dharavi redevelopment survey records to Brihanmumbai Municipal Corporation tender documents, and the problem has quietly grown serious enough that officials, archivists, and urban planners are now publicly calling for a systematic replacement program.

The issue matters right now because Maharashtra's BJP government has staked enormous administrative credibility on the digitisation of civic records. The Dharavi Redevelopment Project, managed under the Dharavi Redevelopment Project Private Limited structure and involving the Adani Group, requires accurate photographic documentation of roughly 650,000 residents and their tenement structures. Duplicate or wrongly tagged images in those files are not a minor IT glitch, they can affect eligibility determinations for rehabilitation housing, a point that urban documentation specialists have raised at two forums held in the city this year.

At a panel discussion hosted by the Urban Design Research Institute on Bhulabhai Desai Road in late June, practitioners described a pattern they see repeatedly: when large municipal projects ingest photographs from multiple field teams using different devices and naming conventions, the backend systems produce duplicate entries. The images themselves are not deleted, they accumulate, and when a caseworker or planner pulls a file, they may be looking at the wrong structure, the wrong plot, or in some cases a photograph from an entirely different ward.

Where the Problem Is Showing Up

The Mumbai Metro Rail Corporation's documentation pipeline for the Metro Line 3, the underground Colaba-Bandra-SEEPZ corridor that opened its first phase in October 2023, ran into similar difficulties during its final asset-registration stage, according to infrastructure documentation professionals familiar with the process. Utility maps and station inspection photographs were duplicated across shared drives, creating version-control confusion that required manual reconciliation over several months. The Metro Line 2A and 7 corridor, running from Dahisar to D.N. Nagar, experienced comparable issues during its handover documentation in 2022.

The BMC's Geographic Information System cell, based at its headquarters on Mahapalika Marg in the Fort area, has been working since early 2025 on a protocol for automated duplicate detection across ward-level property survey images. The cell's work draws on open-source image-hashing tools already used in several European municipal systems, adapted for the volume of data Mumbai generates, the city's property tax survey database alone runs to tens of millions of individual image files. Civic technology observers who track BMC's digital infrastructure projects say the cell has been under-resourced relative to the scale of that task.

Experts speaking at the Bombay Chamber of Commerce's Smart City working group, which met at Mackinnon Mackenzie Building near Ballard Estate in May, pointed to a practical consequence: when state agencies submit digitised records to the Maharashtra Remote Sensing Applications Centre or to RERA filings, duplicate images inflate file sizes, slow verification, and in some documented cases have caused automated compliance checks to flag legitimate submissions as errors.

What Specialists Are Recommending

The broad consensus among archivists and GIS professionals active in the city is that Mumbai needs a phased duplicate-image replacement policy, not just detection. Detection without replacement leaves the corrupted record in place. The recommended approach involves three steps: automated flagging using perceptual hash algorithms, human review for ambiguous matches, and a mandatory replacement window before records are certified for legal or administrative use.

Maharashtra's IT department issued a data-quality circular in March 2026 directing all state-level departments to audit digitised records ahead of the state's next e-governance review, scheduled for the fourth quarter of 2026. Whether individual departments including the BMC and the Slum Rehabilitation Authority treat image deduplication as part of that mandate is, at present, not formally specified in the circular's guidelines.

For residents or businesses dealing with digitised property or rehabilitation records, the practical advice from documentation specialists is direct: request a copy of any photograph attached to your official file, verify it matches your actual premises, and file a written correction request through the relevant ward office, in Mumbai, the 24 ward offices each maintain a grievance register for record discrepancies. Getting ahead of a duplicate-image error before a project milestone is considerably easier than disputing it after a decision has been issued.