São Paulo Leads Latin America in Tackling Duplicate Image Problem, But Lags Behind Seoul and Amsterdam

São Paulo's city government has been quietly waging a bureaucratic battle that affects everything from public housing permits to cultural heritage records: the proliferation of duplicate images clogging its digital infrastructure. According to documents reviewed by The Daily São Paulo, the Prefeitura's Secretaria Municipal de Gestão — housed in a building on Rua São Bento in the Centro district — has been piloting a deduplication protocol since March 2025, targeting tens of thousands of redundant image files stored across at least four separate municipal databases.

The problem is more consequential than it sounds. When duplicate images pile up in government systems — identical or near-identical photographs of properties, public works sites, and identification documents stored multiple times under different filenames — they slow processing times, inflate storage costs, and introduce errors into official records. For residents waiting on housing decisions or infrastructure permits in neighborhoods like Itaquera or Cidade Tiradentes, that bureaucratic drag has real-world consequences.

Why Now, and What São Paulo Is Actually Doing

The timing is not coincidental. Brazil's Lei Geral de Proteção de Dados, the country's data protection framework, has been in full enforcement mode since 2021, and the Autoridade Nacional de Proteção de Dados has been pushing public bodies to audit their data holdings for redundancy, accuracy, and compliance. The Prefeitura's March 2025 pilot, which covers image files attached to building inspection reports filed through the SP156 platform — the city's official service portal — is partly a response to that pressure.

The Instituto de Tecnologia e Sociedade, a Rio de Janeiro-based digital rights organization with an active research presence in São Paulo, published a report in November 2024 estimating that Brazilian municipal governments collectively store an amount of redundant digital data equivalent to roughly 30 percent of their total storage budgets. The Prefeitura has not publicly confirmed a specific figure for São Paulo, but the deduplication pilot's stated goal, according to a March 2025 procurement notice on the city's transparency portal, is to reduce image storage overhead in the SP156 system by at least 20 percent within 18 months.

The technology being deployed involves perceptual hashing — a method that generates a fingerprint for each image based on its visual content rather than its filename or metadata, allowing near-identical images to be flagged even when they have been renamed or slightly cropped. The contract, awarded in early 2025, went to a Brazilian software firm based in the Berrini corridor in Vila Olímpia, São Paulo's technology business district.

How São Paulo Compares to Seoul, Amsterdam, and Bogotá

Globally, the duplicate image problem is not unique to São Paulo, but the approaches vary considerably. Seoul's Smart City division began a citywide digital asset deduplication program in 2022 as part of a broader smart infrastructure push, targeting municipal CCTV archives and land registry photographs simultaneously — a scope São Paulo has not yet reached. Amsterdam's city archive, the Stadsarchief, has been running a continuous deduplication and image quality audit on its historical records since 2019, supported by European Union digital heritage funding that Brazilian municipalities simply do not have access to.

Bogotá, a more direct peer in the Latin American context, is behind São Paulo. The Colombian capital's Secretaría General launched a comparable audit only in late 2025, and as of this year has not yet moved to active deduplication, according to a January 2026 presentation published by Bogotá's digital governance office. That puts São Paulo roughly two years ahead in the process — a meaningful gap in a region where digital records infrastructure has historically been underfunded.

The practical stakes for São Paulo residents will become clearer by September 2026, when the Prefeitura's Secretaria Municipal de Gestão is expected to publish the first audit results from the SP156 pilot. Residents and businesses that regularly submit permit applications, particularly contractors working in infrastructure-heavy zones like the Marginal Tietê corridor, should expect the portal to run faster and return fewer processing errors once the deduplication layer is fully active. Anyone currently experiencing unexplained delays on image-dependent applications — property regularization, inspection sign-offs, heritage listing requests — can log a query directly through SP156 or visit the Poupatempo unit at Avenida Paulista 1313 for in-person assistance.