Istanbul's Duplicate Image Crisis: The Key Decisions That Will Shape the City's Digital Heritage

Istanbul's municipal bureaucracy is sitting on a problem it can no longer ignore. Thousands of duplicate and misattributed images have accumulated across the Istanbul Metropolitan Municipality's digital archive systems — affecting everything from Bosphorus development permit files to heritage-site documentation in Sultanahmet — and administrators are now being forced to decide how, and how quickly, to fix it.

The issue has gained urgency in 2026 for practical reasons. The municipality, which operates under Mayor Ekrem İmamoğlu and the CHP, has been pushing a broad digitalisation drive to modernise city services, and duplicate image data is now jamming that pipeline. Construction and zoning reviews along the Karaköy waterfront and the contested Galataport development corridor have reportedly stalled at processing stages where image verification is required, slowing permit timelines for dozens of applicants.

Why This Matters Beyond the Filing Cabinet

Istanbul is not the only city wrestling with this. Rome's municipal archives ran a two-year deduplication project between 2021 and 2023, and Barcelona's urban planning office overhauled its geo-tagged image database ahead of its 2026 smart-city investment round. Istanbul's situation is complicated by the sheer scale of its documentation needs: the city spans 39 districts, manages more than 2,700 registered historical buildings, and processes tens of thousands of construction applications annually through the İBB's digital portal, ibb.istanbul.

The Syrian refugee integration files managed through the Istanbul Directorate of Migration also rely on image-matched identity documentation, and duplicate records there carry legal consequences beyond administrative inconvenience. A misidentified photograph can delay family reunification cases or trigger false-positive alerts in the national MERNIS identity registry, which links municipal and national records.

Tourism adds another layer of pressure. The Istanbul Culture and Tourism Directorate supplies images to platforms including Google Arts & Culture and Booking.com, and duplicate or incorrectly tagged photographs of sites such as the Chora Church in Edirnekapı or the Rumeli Fortress in Sarıyer have been flagged by international partners as presenting accuracy problems. The Chora Church — formally the Kariye Mosque since its reconversion in 2020 — is particularly sensitive, given that photographs taken before and after the reconversion are frequently mislabelled in shared databases.

The Decision Points Ahead

Three choices now face the Metropolitan Municipality, and the window for making them is narrowing. First, administrators must decide whether to run deduplication in-house using the İBB's existing IT infrastructure or to tender the work to an external contractor. Procurement rules under Turkey's Public Procurement Law No. 4734 require open tender for contracts above a certain threshold, and a project of this scale would almost certainly cross it, adding months to the timeline.

Second, the municipality must settle on a metadata standard. The most widely adopted international standard for municipal image archives is the IPTC Photo Metadata Standard, used by cities including Vienna and Amsterdam. Adopting it would make Istanbul's archive compatible with European heritage databases — relevant given Turkey's ongoing observer relationship with EU cultural preservation programs — but would require retagging a backlog that city IT staff have described to reporters in general terms as running into the hundreds of thousands of files.

Third, and most politically charged, is the question of who owns the corrected archive. The national Culture Ministry, which controls some of the heritage building files that overlap with municipal records, has its own parallel digital archive at kulturportali.gov.tr. Resolving jurisdiction over duplicate files that sit in both systems will require coordination between the İBB and Ankara — a relationship that has been, to put it mildly, complicated since İmamoğlu's election in 2019.

The most immediate practical step, according to standard archival practice in comparable European municipal systems, is a freeze on adding new images to the existing repository while a baseline audit is completed. Several district municipalities in Istanbul, including Beyoğlu and Kadıköy, operate semi-autonomous image databases that would also need to be brought into scope. Without that coordination, any deduplication of the central archive risks being undone within months as uncleaned district files sync back into the system.

Decisions made in the next 90 days will determine whether Istanbul's digitalisation drive accelerates or bogs down in its own paperwork — with real consequences for residents waiting on permits, researchers documenting the city's heritage, and officials trying to run one of the world's most complex urban administrations.