Brussels Pushes Ahead This Week on Duplicate Image Replacement Across Public Archives

The Brussels Stedelijk Archief confirmed this week that its ongoing duplicate image replacement programme has entered its most intensive phase yet, with staff processing an estimated 12,000 flagged image records across the city's digital heritage portal between Monday and Friday. The push follows a February 2026 audit that identified widespread redundancy in the archive's online catalogue — in some cases, the same photograph of Sainte-Catherine church was tagged under more than thirty separate event entries spanning two decades.

The timing is not accidental. Brussels is midway through a broader digitisation effort tied to the 2025–2028 Digital Heritage Action Plan adopted by the Brussels-Capital Region. That plan allocated €4.2 million toward metadata standardisation and asset deduplication across municipal systems — and duplicate imagery, archivists say, has long been the most persistent and least glamorous obstacle to clean, searchable public records.

What Actually Changed This Week

On Monday, the team at BISA — the Brussels Institute for Statistics and Analysis — pushed an updated feed to the open data portal at data.brussels.be, stripping out 847 duplicate image attachments that had been linked to neighbourhood-level urban development reports covering the Molenbeek-Saint-Jean and Anderlecht districts. The duplicates had accumulated over roughly six years of quarterly reporting cycles, in which the same stock photograph of the Canal Zone was reused to illustrate different policy documents without unique identifiers being assigned.

By Wednesday, the Musée de la Ville de Bruxelles on the Grand-Place had separately confirmed it completed the first full pass of its own digital image inventory — some 38,000 records — using new hashing software introduced in April. The tool compares pixel-level fingerprints rather than file names, meaning even slightly cropped or resized copies of the same image are caught. Around 3,100 duplicates were identified in that scan, and replacement images sourced from the museum's undigitised physical collection are now being scanned at roughly 400 items per week.

The practical stakes matter for more than aesthetics. Under the European Commission's Directive on Open Data and the Re-use of Public Sector Information — which Belgium transposed into national law in 2021 — public bodies are required to ensure that datasets made available for re-use are accurate and non-redundant. Researchers, journalists, and urban planners who pull image data from Brussels's public repositories to study neighbourhood change or track infrastructure projects have complained for years about distorted timelines caused by misdated duplicate images appearing as distinct records.

The Wider Picture for Brussels Residents

The replacement work is visible to ordinary residents in one practical way: the Beeldbank Brussel photographic library, accessible at beeldbank.brussels, has updated its search interface this week to flag images that have been verified as originals during the current review cycle. A small green checkmark icon now appears beside verified entries — a feature that did not exist before Thursday's site update.

Ixelles-based heritage group Patrimoine & Avenir, which advocates for accurate documentation of the Ixelles Ponds area and the Flagey neighbourhood, had previously noted in a March 2026 position paper that duplicate imagery was distorting the visual record of construction projects near Place Flagey. Its members have been among those pushing the city to move faster on deduplication since at least 2024.

The current sprint is scheduled to run through July 18, at which point archivists will publish an interim report on the project's data.brussels.be page. Anyone who believes a specific image record in the Beeldbank or the Stedelijk Archief is incorrectly marked — either flagged as a duplicate when it is not, or missed despite being a copy — can submit a correction request through the portal's feedback tool. The Stedelijk Archief has processed 214 such community-submitted corrections since the programme launched in October 2025.