Istanbul's Digital Archives Race to Replace Thousands of Duplicate Heritage Images This Week

Istanbul's cultural institutions are in the middle of a messy, overdue cleanup. This week, the Istanbul Metropolitan Municipality's digital infrastructure directorate confirmed it is mid-way through a structured audit of its photographic archives, targeting what internal working documents describe as tens of thousands of duplicate image files that have accumulated across municipal servers over at least the past eight years. The problem is not cosmetic. Redundant files are consuming server capacity, slowing public-access portals, and — in the worst cases — pushing original, high-resolution heritage photographs out of active indexing because lower-quality duplicates have been catalogued in their place.

The timing matters. Turkey's Cultural Heritage Digitisation Programme, a joint initiative between the Ministry of Culture and Tourism and municipal governments, set a July 2026 benchmark for participating cities to have clean, deduplicated master archives ready for integration into a national portal. Istanbul, as the country's largest contributor of heritage imagery, carries the heaviest load. The Kahramanmaraş earthquakes of February 2023 sharpened everyone's appetite for robust digital backups of irreplaceable historical sites — and exposed how disorganised many of those backups actually were.

Where the Problem Runs Deepest

Two institutions in particular have emerged as focal points this week. The İstanbul Araştırmaları Enstitüsü — the Istanbul Research Institute, based in Beyoğlu on Meşrutiyet Caddesi — is working through a catalogue that staff have been building since the mid-1990s. Decades of scanning campaigns, often conducted by different contractors using different file-naming conventions, left the archive with significant duplication: multiple scans of the same Ottoman-era photograph filed under different accession numbers and stored in different folder hierarchies. The institute is using open-source deduplication software this week to flag matches before human reviewers make final calls on which version to keep.

Across the Golden Horn, the Fatih Municipality's Tarihi Yarımada (Historic Peninsula) documentation unit is facing a parallel challenge with drone survey imagery collected between 2021 and 2025 across the Sultanahmet and Beyazıt districts. Each survey season produced overlapping flight paths, and compressed preview files were frequently saved alongside full-resolution originals in the same folders without clear labelling. Staff are now manually reviewing flagged batches — a slow process that the unit's working schedule, reviewed by this reporter, shows is running at roughly 1,200 files cleared per working day.

The financial dimension is real. Cloud storage costs in Turkey have risen sharply alongside the lira's sustained depreciation. Municipal IT budgets priced in lira are buying meaningfully less dollar- or euro-denominated server capacity than they were two years ago. Duplicate files are not a bureaucratic nuisance; they are a line item. Industry estimates published by the Ankara-based tech consultancy firm Bilişim Araştırma Merkezi in May 2026 put unnecessary storage costs from unmanaged duplication across Turkish public-sector archives at roughly 47 million lira annually — a figure that, at current exchange rates, represents several million euros of avoidable expenditure.

What Comes Next for Institutions and the Public

Both institutions expect to complete initial deduplication passes before the end of July. After that, the cleaned archives are due to be submitted to the national portal's staging environment for cross-referencing — a process that will itself surface further duplicates when Istanbul's records are matched against holdings from İzmir, Bursa, and Ankara.

For researchers and members of the public who use the Istanbul Metropolitan Municipality's open-access image library — available through the IBB's digital portal — the practical consequence should be a faster, better-organised search experience by autumn. Photographs of landmarks from Kapalıçarşı to the Galata Tower have historically appeared multiple times in search results, in varying resolutions, sometimes with conflicting caption information. The cleanup is designed to resolve that.

Institutions holding physical photograph collections and planning to submit digital scans to any municipal or national programme would be well advised to adopt consistent file-naming protocols before scanning begins, rather than attempting deduplication after the fact. The lesson from this week's audit is straightforward: redundancy is far cheaper to prevent than to untangle.