Istanbul's Duplicate Image Problem: The Key Decisions Ahead for a City Rewriting Its Visual Archive

A quiet but consequential dispute is playing out inside Istanbul's municipal bureaucracy: thousands of photographs registered in official planning and heritage databases have been flagged as duplicates, near-duplicates, or outright replacements of the originals — and nobody yet has full authority to decide which version counts. The Istanbul Metropolitan Municipality's Geographic Information Systems directorate confirmed in a June 2026 internal audit notice that roughly 14,000 image files attached to urban planning records across the city's 39 districts required verification before the next round of zoning amendments could proceed.

The timing matters. Turkey's Ministry of Environment, Urbanisation and Climate Change set a September 30, 2026 deadline for municipalities to submit updated digital cadastral files as part of the national e-Devlet integration programme. Istanbul, which manages the largest and most contested urban footprint in the country, cannot miss that window without risking the suspension of project approvals worth billions of lira. With earthquake retrofit work accelerating in Fatih, Zeytinburnu, and Avcılar following the 2023 Kahramanmaraş disaster, stalled approvals carry a direct human cost.

What Created the Mess

The root problem is fragmentation. At least four separate agencies maintain photographic records of Istanbul's built environment: the Metropolitan Municipality itself, the General Directorate of Land Registry and Cadastre (TKGM), the Istanbul Earthquake Risk Mitigation and Emergency Preparedness Project known as ISMEP, and the private contractors who conduct field surveys under municipal tender. When a building is demolished, retrofitted, or simply rephotographed under better light, the new image sometimes overwrites the original in one database but not the others, leaving behind what archivists call orphaned duplicates — files that share a cadastral parcel number but depict different structures or different points in time.

Sultanahmet and Karaköy have proved particularly problematic. Both neighbourhoods saw intensive façade documentation during the 2022-2024 heritage survey commissioned by the Istanbul branch of the Chamber of Architects. That survey produced an estimated 280,000 images, and the handover protocol between the Chamber and municipal servers was, by multiple accounts in professional architecture circles, poorly standardised. The result: the same Ottoman-era hans on Bankalar Caddesi appear under at least three distinct file identifiers in the planning portal, with metadata timestamps ranging from 2019 to 2025.

The Decisions That Will Determine the Outcome

Three choices now sit on the desks of municipal and national officials, and how they fall will shape Istanbul's planning machinery for the next decade.

First, the municipality must decide whether to adopt a centralised master image repository — a single server environment that all agencies must write to — or to keep the current distributed model and simply impose stricter naming conventions. Centralisation is faster to audit but requires the kind of inter-agency data-sharing agreement that has historically stalled in Ankara's bureaucratic channels. The distributed model preserves institutional autonomy but perpetuates the exact duplication risk that triggered the current crisis.

Second, TKGM must rule on legal primacy: when a duplicate is found, which agency's version is the legally binding record? Under current regulations there is no clear answer. A draft ministerial circular circulated in May 2026 proposed that TKGM's registered image would take precedence, but the Metropolitan Municipality has not publicly accepted that framing, and the CHP-led administration under Mayor Ekrem İmamoğlu has been cautious about ceding data authority to central-government bodies.

Third, and most practically urgent, the city's Department of Urban Transformation must determine by August 15 whether to pause new demolition-and-rebuild approvals in the seven highest-risk neighbourhoods — including Bağcılar and Güngören — until the image records are cleaned, or to proceed on the assumption that field inspectors can manually verify site conditions. Pausing protects legal integrity. Proceeding protects the retrofit schedule that tens of thousands of residents in ageing concrete blocks are counting on.

Technical consultants working on the e-Devlet integration have pointed to Ankara's experience as a cautionary reference: the capital resolved a similar image-duplication crisis in its Çankaya district records in 2023, but the cleanup took eleven months and delayed approximately 400 planning decisions. Istanbul's timeline is tighter and its caseload far larger. The September 30 deadline will not move. What gives — data quality, legal certainty, or earthquake preparedness — is the question Istanbul cannot afford to leave unanswered.