Helsinki's Digital Archives Face a Crisis of Duplicate Images — and Experts Want Action Now

Helsinki's network of public digital archives is carrying tens of thousands of duplicate photographs, and the people responsible for managing those systems say the situation has moved from nuisance to genuine problem. City officials at the Helsinki Urban Environment Division, archivists at the Helsinki City Archives on Hämeentie, and technology procurement specialists working under the City Executive Office have all, in recent months, been pushing for a coordinated replacement strategy — one that would clear redundant image files from public-facing platforms and establish binding standards to prevent replication in the future.

The issue has sharpened because Helsinki is midway through a significant digitisation push. The city's Helsinki 2030 Digital Strategy, adopted by the City Council in late 2024, committed to consolidating public data infrastructure across all departments by the end of 2027. That deadline has focused attention on the quality of what is already in the system — and on how badly that system has degraded through years of uncoordinated uploads by separate departments, contractors and public engagement platforms.

What Officials and Archivists Are Saying

Nobody at the City Archives is pretending the duplication problem is minor. Staff at the Hämeentie facility, which holds both physical and born-digital collections dating back to the 19th century, have identified the issue as one of the three largest practical barriers to the 2030 consolidation goal, according to an internal planning document circulated within the Urban Environment Division earlier this year. The document, which The Daily Helsinki has reviewed, describes the backlog of unverified or redundant image assets across city-managed platforms as running into the hundreds of gigabytes — a figure that translates into real costs when cloud storage contracts are renewed annually.

Technology specialists working with Forum Virium Helsinki, the city-owned innovation company based in Vallila, have been advocating for automated deduplication tools as part of the city's open data infrastructure refresh. Forum Virium's work on smart city systems gives it a direct stake in clean, reliable datasets. Representatives from the organisation have argued in internal working group meetings that duplicate images do not simply waste space — they introduce errors into machine-learning models trained on city data, skew analytics used to guide planning decisions, and create legal ambiguity when the same image appears under different licensing conditions in different corners of the archive.

The Helsinki City Museum, headquartered in the old Sederholm House on Senate Square, faces a parallel version of the problem on its public-facing Finna database portal, which serves as Finland's national discovery interface for library, archive and museum collections. Museum professionals have flagged that duplicate entries for historical photographs of neighbourhoods like Kallio, Töölö and Pasila are confusing researchers and members of the public who rely on the portal for accurate source material.

What a Fix Would Actually Look Like

The working consensus emerging from the city's internal discussions points toward a phased replacement programme rather than a single purge. The first phase, which officials want to begin before the end of 2026, would involve auditing image holdings across the four largest city-managed platforms, including the Urban Environment Division's planning map portal and the City Museum's Finna collections. Estimates from Forum Virium's technical team suggest that a rigorous deduplication run could reduce image storage load by between 20 and 35 percent on those platforms alone — a significant operational saving given that the city's cloud infrastructure costs have risen alongside broader European data centre pricing pressures since 2023.

The second phase would introduce mandatory metadata standards for any new image upload across city departments, with a centralised registry managed from the City Archives. Officials believe that without this second step, any short-term cleanup would simply be undone within two to three years.

For residents and researchers who use Helsinki's public digital resources, the practical advice from archivists right now is straightforward: if you encounter duplicate or conflicting image records on Finna or the Urban Environment planning portal, use the feedback function built into both platforms. The City Archives has confirmed it is actively monitoring those submissions as it builds its audit list. The cleanup is coming. How thorough it is will depend on how quickly the city can agree on the standards that follow it.