Berlin's Duplicate Image Problem: How the City Stacks Up Against Amsterdam, Vienna and Seoul

Berlin's municipal data offices are sitting on hundreds of thousands of duplicate property and street-level images embedded in public planning databases, cadastral records, and the city's own open-data portal — and a structured removal programme only got underway in earnest in January 2026. The scale of the backlog, accumulated across more than three decades of digitisation projects that rarely talked to one another, has forced the SPD-led Senate to treat the cleanup as a genuine infrastructure priority rather than an IT housekeeping task.

The timing matters. Berlin's housing shortage has pushed the Senate's urban planning arm, the Senatsverwaltung für Stadtentwicklung, Bauen und Wohnen, into an aggressive rezoning drive across Marzahn-Hellersdorf and Tempelhof-Schöneberg. Duplicate or mismatched building images in official databases slow permit approvals and, in some cases, attach the wrong structural data to properties — a problem that has already complicated at least one social housing tender on Greifswalder Straße in Prenzlauer Berg, according to planning documents circulated within the Senate earlier this year.

What Berlin Is Doing — And Where It Falls Short

The city awarded a contract in February 2026 to the Berlin-based data firm Dataport AöR, the public IT service provider shared by several German federal states, to audit and deduplicate image assets across four core planning portals. The project is budgeted at roughly €2.4 million and is scheduled to run through the end of 2026. Dataport is using a combination of perceptual hashing algorithms and manual review teams based at its Albrechtstraße office in Mitte. As of late June, the team had processed approximately 38 percent of the targeted image inventory, according to Senate budget documents reviewed by The Daily Berlin.

By contrast, Amsterdam completed a comparable exercise through its Gemeente Amsterdam Digitaal platform in 2023, finishing 14 months ahead of schedule after the city adopted a fully automated pipeline that required no manual review for images below a similarity threshold of 96 percent. Vienna's MA 41 — the city's survey and geoinformation office — embedded deduplication directly into its upload workflow in 2021, meaning new duplicates are blocked at the point of entry. Seoul's Smart City division went further, tying its image database to a real-time AI layer that flags duplicates within 72 hours of ingest. Berlin has none of these automated gatekeeping mechanisms yet.

The gap is partly structural. Berlin's data is spread across the Berliner Senat, the twelve Bezirksämter, and semi-autonomous bodies like the Berliner Stadtgüter and the BIM Berliner Immobilienmanagement GmbH, each maintaining its own image repositories under different technical standards. That fragmentation is a legacy of the city's post-reunification administrative design, and it means no single automated rule can be applied universally without a prior harmonisation layer — work that Dataport AöR has flagged will require an additional €800,000 investment beyond the current contract if the Senate wants a permanent fix rather than a one-time purge.

What Comes Next for Planners and Residents

The Senate is expected to present a long-term digital asset governance framework to the Abgeordnetenhaus before the autumn recess, likely in September 2026. That framework is anticipated to propose mandatory deduplication checkpoints for all publicly funded image uploads — a standard that would bring Berlin closer to what Amsterdam and Vienna already enforce by default.

For residents and architects navigating the city's notoriously slow Baugenehmigung process, the practical effect of the cleanup should be tangible within twelve months. Permit officers at the Stadtentwicklungsamt in Friedrichshain-Kreuzberg have already reported fewer data-conflict flags on applications since the Dataport audit began, though the Marzahn-Hellersdorf Bezirksamt — handling some of Berlin's largest new-build plots — only joined the audit programme in May 2026 and remains behind schedule.

Berlin is not the worst-performing major European city on this file. Paris's Direction de l'Urbanisme is still mapping the full scope of its duplicate image problem across the Géoportail Paris platform, with no active contract in place as of this month. But Amsterdam, Vienna, and Seoul have demonstrated that the difference between a one-time purge and a permanent solution is mostly a question of political will and a few hundred thousand euros in upfront automation investment — a gap Berlin's Senate will have to close if it wants the housing and rezoning drive to move at the speed the shortage demands.