Athens Tackles Duplicate Image Problem Plaguing City's Digital Archive This Week

Athens' municipal digital archive has a clutter problem. City technicians at the Athens Urban Planning Directorate confirmed this week that a systematic audit launched in late June identified more than 4,000 duplicate image files across the municipality's shared databases — records used by departments ranging from building permits to tourism promotion.

The issue matters now because the city is mid-way through a digital overhaul tied to Greece's National Digital Transformation Strategy, a reform programme running through 2027 and backed by EU Recovery and Resilience Facility funding. Bloated, duplicated assets slow down permitting workflows and distort search results, a tangible problem when municipal offices are already under pressure to process record numbers of building licence applications driven by the Airbnb conversion rush in central Athens.

Where the Problem Shows Up

Two institutions have felt the impact most directly. The Gennadius Library, on Souidias Street in Kolonaki, reported that its digitised photographic collection — spanning Ottoman-era Athens through the post-war period — had accumulated duplicate entries after a 2024 migration to a new cataloguing platform. Staff discovered hundreds of identical image files assigned different accession numbers, a clerical tangle that delayed the library's planned public search portal, originally scheduled to go live in spring 2026.

The Athens Development and Destination Management Agency, known by its Greek acronym EATA, runs the city's official tourism image bank used by travel media worldwide. Agency staff told internal project meetings this month — meeting notes circulated among partner organisations — that duplicate files were consuming roughly 18 percent of allocated server storage, based on the agency's own IT review. That storage problem has direct cost implications as EATA prepares to renew its cloud hosting contract before September.

The duplication traced back to a straightforward but persistent workflow failure: multiple departments uploading the same source photographs through different access points, with no automated deduplication layer sitting between them. A similar issue affected Rome's municipal digital archive in 2023, ultimately requiring a six-month correction project before the city's cultural heritage portal could relaunch cleanly.

What the City Is Doing About It

The Athens Urban Planning Directorate began deploying perceptual hash-matching software on June 23, a technique that identifies visually identical or near-identical images regardless of filename or metadata. The tool is being run across approximately 280,000 files held in the central municipal repository. The first phase of the audit — covering building and planning records — is due to complete by July 18.

The broader clean-up across cultural and tourism image banks is budgeted at around €95,000 under a procurement contract awarded in May to a Greek IT services firm, according to public spending records published on the Diavgeia transparency platform. A second firm has been engaged specifically to handle the Gennadius Library migration review, though the value of that contract has not yet appeared in Diavgeia records as of this morning.

For photographers, architects, and journalists who regularly download assets from the city's public portals — including the Acropolis Museum image library on Dionysiou Areopagitou Street — the practical advice this week is to re-download any files obtained before June 23 and cross-check accession numbers against the updated catalogue. The Acropolis Museum's own digital team said in a public notice posted to its website on July 1 that it had completed its internal deduplication review and that its image bank is now cleared of confirmed duplicates.

The full municipal audit is expected to produce a final report by the end of August, which the Urban Planning Directorate plans to present to the Athens City Council ahead of the autumn budget session. Whether the corrected archive becomes the foundation for a unified city-wide open-data image portal — something advocates in the Greek open-data community have pushed for since 2022 — will depend on that report's recommendations and the council's appetite for further investment.