Istanbul's Duplicate Image Problem: What Officials, Experts and Key Figures Are Saying

Istanbul's municipal digital infrastructure is sitting on a quiet but consequential mess. Duplicate images — identical or near-identical photographs filed under different reference numbers across planning, heritage and property databases — have created conflicting records that are slowing permit approvals, complicating earthquake-retrofit assessments and muddying the city's official tourism archives. The Istanbul Metropolitan Municipality's Department of Geographic Information Systems, which operates from its coordination centre in Kagithane, confirmed earlier this year that a systematic audit of its asset image libraries was underway, though officials have declined to give a completion date.

The timing matters. Since the February 2023 Kahramanmaras earthquakes, Istanbul's district municipalities have been under pressure to accelerate building-risk surveys across older neighbourhoods including Fatih, Zeytinburnu and Bagcilar. Each surveyed building requires photographic documentation filed against a unique cadastral reference. Where duplicates exist — the same facade photograph attached to two separate plots, for instance — risk classification becomes legally contestable. Engineers and urban planners working on the city's earthquake-preparedness programme have flagged this as a practical obstruction, not a theoretical one.

What the Experts Are Saying

Academics at Istanbul Technical University's Faculty of Architecture, located on the Taskisla campus in Sisli, have been vocal about the downstream effects. Faculty members working on the university's urban resilience research have described the image-duplication problem as symptomatic of a broader failure to standardise metadata protocols when the city scaled up its digital documentation efforts rapidly after 2019. Without consistent file-naming conventions and geotag verification at the point of upload, duplicate entries accumulate faster than manual review teams can clear them.

The Istanbul branch of the Chamber of City Planners — Sehir Plancilar Odasi — has raised similar concerns in submissions to the metropolitan planning authority, arguing that heritage zones around the Sultanahmet peninsula and the Bosphorus shoreline face particular risk. Those areas fall under overlapping jurisdictions: the municipality, the Ministry of Culture and Tourism, and UNESCO monitoring bodies. When a single building's photographic record contains duplicates filed under different institutional codes, determining which image is authoritative for planning purposes can stall decisions for months.

Fatih Municipality, which administers one of the city's most densely documented historic districts, launched its own internal image-verification pilot in March 2026. The pilot covers approximately 4,200 building records in the areas between Yedikule and Aksaray. Officials have not published interim findings, but the project is being watched by at least three other district municipalities — Beyoglu, Uskudar and Kadikoy — which face comparable cataloguing backlogs.

Technology Sector Weighs In

Istanbul's growing civic-tech community, centred partly around co-working and innovation hubs in Maslak and the Atasehir financial district, has entered the conversation. Several software firms have pitched automated duplicate-detection tools to the metropolitan municipality, with proposals ranging from perceptual-hash comparison systems to AI-assisted georeferencing audits. The municipality has not publicly confirmed which, if any, vendor contracts have been signed.

The financial stakes are not trivial. Istanbul's municipal digital systems are tied to property tax valuations, and disputed image records have been cited in at least a handful of administrative court cases in the past two years as grounds for challenging assessed values. Lawyers practising in the Cagaloglu courthouse district, where administrative property disputes are heard, have noted an uptick in cases where photographic evidence attached to cadastral records is questioned on authenticity or uniqueness grounds.

For residents and property owners, the practical advice from urban-law specialists is straightforward: if you are involved in a building permit, retrofit approval or heritage-zone application, request in writing that the municipality verify the uniqueness of any photographic record attached to your plot before the review clock starts. Delays caused by administrative image errors are easier to pre-empt than to challenge after a ruling has been issued. The audit now underway in Kagithane is expected to produce draft protocol guidelines — though city officials have not committed to a public release date for those findings.