Istanbul's Fight Against Duplicate Urban Images: Behind the Curve or Setting the Pace?

Istanbul's municipal photography archive holds an estimated 2.3 million images of the city's public infrastructure, heritage sites and street-level urban changes — and a significant portion of those records are duplicates, mislabelled, or conflict directly with one another. That is the administrative headache now sitting on the desk of the Istanbul Metropolitan Municipality's (IBB) Urban Information Systems directorate, which began a digital audit of its visual databases in March 2026 after years of fragmented cataloguing across separate borough councils.

The problem is not cosmetic. Duplicate images in municipal databases create real planning errors. When two photographs tagged to the same Fatih district building show different structural states — one pre-renovation, one post — and neither is dated correctly, engineers and preservation officers make decisions on faulty premises. In a city where 65 percent of buildings predate modern earthquake codes, according to IBB's own Urban Transformation Department figures published in 2024, that kind of data confusion carries physical consequences.

What Istanbul Is Actually Doing

The IBB launched a contract in early 2026 with Türksat, the state-run satellite and data services company, to integrate AI-assisted deduplication software across its GIS and visual records systems. The Türksat agreement covers the IBB's main archive facility in Sütlüce, on the Golden Horn's northern bank, and is expected to process roughly 800,000 image files by the end of the third quarter of this year. Borough-level archives in Beyoğlu, Kadıköy and Üsküdar are scheduled for integration in a second phase, beginning in October 2026.

The Kadıköy Municipality has been running its own smaller-scale version of this work since 2024, cross-referencing street photography from its urban renewal program along Moda Caddesi with satellite imagery provided through a partnership with the Boğaziçi University Remote Sensing Laboratory. That collaboration has already flagged more than 12,000 duplicate or conflicting image pairs, according to the university's publicly available project summary released in May 2026.

SALT Research, the Istanbul-based archive and cultural institution headquartered in Beyoğlu, has separately been digitising and deduplicating its own historical photography collections since 2021. Its approach — using metadata standardisation rather than pure AI matching — is now being studied by the IBB as a possible model for heritage-specific records where context matters more than pixel-matching accuracy.

How Istanbul Stacks Up Against Other Cities

Barcelona's Ajuntament completed a full deduplication of its public urban image archive in 2023, cutting its database from 4.1 million to 2.8 million records and integrating the result into a single GIS platform accessible to all municipal departments. Seoul's Smart City division finished a comparable exercise in 2022, with the added step of time-stamping every street-level image against city CCTV logs to establish verified chronology — a level of integration Istanbul has not yet approached.

Istanbul's challenge is compounded by scale and governance fragmentation. The city's 39 district municipalities each maintain partial records, and political tensions between the IBB, led by CHP Mayor Ekrem İmamoğlu, and several AKP-controlled borough councils have slowed data-sharing agreements in at least three districts, according to IBB infrastructure documents reviewed for this article. That friction has no equivalent in Barcelona or Seoul, where municipal governance is more consolidated.

London's Ordnance Survey partnership with Transport for London, which standardised visual asset records across the capital's 33 boroughs by 2024, is frequently cited by Turkish urban planners as the model Istanbul needs — centralised standards, decentralised collection. The IBB's Sütlüce project is structured loosely along those lines, but without the statutory authority to compel borough compliance.

For residents and planners watching Istanbul's Bosphorus shoreline development or the ongoing urban transformation of districts like Fikirtepe and Başakşehir, the practical stakes are immediate. Accurate, deduplicated image records determine which buildings get flagged for earthquake-risk retrofitting, which heritage facades are protected, and which construction permits are granted on the basis of the city's actual current state rather than an outdated photograph from 2018. The IBB's target is to have its core archive clean and searchable by December 2026. Whether the borough-level complications are resolved by then is an open question that no data-cleaning algorithm can answer on its own.