Paris Pushes to Purge Duplicate Images From Public Records: What Officials, Experts and Key Figures Are Saying

Paris's municipal data directorate is under mounting pressure to address a problem hiding in plain sight: thousands of duplicate images clogging the city's official digital archives, from planning permit databases to the Grand Paris Express construction dossiers. The issue has drawn commentary from archivists at the Bibliothèque de l'Hôtel de Ville, urban data specialists at the Apur — the Paris urban planning agency on Avenue de Maine — and at least one adviser within the Mairie de Paris's digital transformation unit, according to multiple people familiar with the discussions.

The timing matters. Paris spent the period following the 2024 Olympics aggressively digitising legacy project documentation, from the Seine-Saint-Denis athletics venues to the remodelled Trocadéro esplanade. That accelerated upload campaign, city planning officials have acknowledged in public forums, was not accompanied by systematic deduplication protocols. The result, specialists say, is a sprawling visual record that is difficult to search, expensive to store and legally ambiguous when images tied to building permits or environmental assessments appear multiple times under different reference numbers.

What the Experts Are Saying

Archival and data management professionals who work with Paris public institutions have been increasingly vocal. Specialists affiliated with the École nationale des chartes, which trains France's archivists and sits on the Rue des Francs-Bourgeois in the Marais, have argued in professional journals that French municipal bodies lag behind counterparts in cities such as Amsterdam and Barcelona in deploying automated hash-based image deduplication. The technique compares pixel-level fingerprints of files to identify exact or near-exact copies without requiring manual review.

At the Apur, whose remit covers the broader Île-de-France metropolitan zone, analysts have pointed to the Grand Paris Express project as a case study in the problem's scale. The metro expansion — currently targeting full network completion by 2030, with line 15 South already operational — has generated hundreds of thousands of site photographs, engineering diagrams and satellite-derived imagery since ground broke on various sections. Without a unified image registry, the same aerial shot of the Villejuif–Institut Gustave Roussy station, for example, may exist in a dozen departmental folders under different file names, each consuming server space billed to the public.

Corinne Hermès, a data governance lecturer at Sciences Po Paris on the Rue Saint-Guillaume, has written that the legal exposure is not trivial. Under French public records law, each unique document technically carries its own administrative identity. Duplicates that are logged separately can complicate freedom-of-information requests, create inconsistencies in court proceedings involving planning disputes, and raise questions under the RGPD — France's implementation of GDPR — when images contain identifiable individuals captured on construction sites or in public consultations.

What City Hall Is Being Asked to Do

Pressure is arriving from several directions. The Contrôleur général of the city's information systems, whose office operates out of the Hôtel de Ville on the Île de la Cité, received a formal recommendation in the spring of 2026 from an internal audit panel urging the adoption of an image deduplication standard across all directorate-level document management systems by the end of 2027. The panel cited storage costs that, according to its report, had risen by roughly 18 percent year-on-year since 2022 — a figure tied partly to uncontrolled file proliferation.

The Seine urban regeneration programme, which is pushing mixed-use development along stretches of the Left Bank between the Bibliothèque nationale de France site at Tolbiac and the Gare d'Austerlitz, has also surfaced the issue at a practical level. Project managers working with the city's Semapa development corporation have described in professional seminars the difficulty of tracking which site images have already been cleared for public release when copies exist across multiple contractor handover packages.

For residents and local elected officials in arrondissements like the 13th and the 19th — both heavily affected by ongoing regeneration work — the immediate consequence is slower responses to planning inquiries and occasional mismatches between what appears in online consultation portals and what is held in formal permit files. The city's digital services office has indicated it plans a procurement process for deduplication tooling before the end of 2026. Specialists advise that any solution must integrate with Paris's existing OpenData infrastructure if it is to serve long-term transparency goals rather than simply reduce a server bill.