Home to Europe's largest seaport, Rotterdam has built two distinct digital layers for two distinct jobs. The municipality's 3D twin brings flood, energy and crowded subsurface infrastructure into planning, while the Port Authority's 44-sensor hydro/meteo platform streams about 1.2 million data points a day toward a future 4D port twin. In Reyeroord, the city deliberately works smaller: residents help test waste, groundwater, lighting and air-quality sensors before ideas travel beyond the neighbourhood.
The atlas documents 5 projects in Rotterdam, the earliest dating to 1997: 1 with a documented success, 4 still running without a verdict. Every entry carries an evidence grade — the strongest here is independent (2 entries) — and links its sources.
Three entries that show what Rotterdam is actually doing.
Computed from the 5 entries below — a profile, not a score.
Rotterdam's oldest digital layer is not a platform but a decision. The Maeslant barrier, built between 1991 and 1997 across the Nieuwe Waterweg at Hoek van Holland, protects the city and its port from the sea — and it closes without anyone giving the order. A control system reads wind, tide and sea level, predicts the surge and issues the closure command itself. In twenty-eight years it has done so against a real storm twice, in November 2007 and December 2023, and once every autumn as a test. Long before the phrase “smart city” existed, Rotterdam had already handed its most consequential municipal decision to software — and, because the software is now the safety-critical part, an independent research team spent 2025 formally verifying it.
The port industrialised that logic. When the Maasvlakte II terminals opened in 2015 on reclaimed land west of the city, they were designed to run with almost nobody on the quay: remote crane operators in an office, driverless electric vehicles between ship and stack. Four years later the port authority put a measuring layer over the water itself with the port IoT and hydro-meteo platform. The two are separate systems run by separate organisations — terminal operators automate their own yards, the authority runs the data about the water — and Rotterdam is a useful place to see that distinction clearly.
The city government's own digital work started later and aimed at a different problem: not the sea, but what is under the street. The municipal 3D twin, begun in 2018, brings flooding, the energy transition and a famously crowded subsurface into one model — deliberately not the same system as the port's twin, a conflation that circulates widely and is wrong. In 2019 the Reyeroord living lab took the opposite approach at neighbourhood scale, testing what residents actually accept from sensors in their own street.
On a time axis, by the year each one started — 1997 to 2019. Pick a dot to read what it was.
✔ Every published entry is checked against the public sources it cites before publication.
Editorial links between Rotterdam's own entries — the city as a system, not a list.
Plans and announced trajectories — not yet documented results.
Rotterdam's next question is less about building instruments than about who is allowed to act on them. The barrier's automation is unusual precisely because its trigger is unambiguous — a forecast water level either crosses a threshold or it does not — and nothing else in the city's toolkit meets that condition; the municipal twin informs planners, it does not close anything. The port's automation keeps advancing on private ground where there is no public to consult, and the accountability gap that comes with it is unchanged: throughput and reliability figures at both Maasvlakte terminals remain operator statements, with no independent audit in the record. The most interesting open item is smaller and civic: whether the Reyeroord approach — asking a neighbourhood what sensing it will tolerate before installing it — survives contact with the rest of the city.
Where Rotterdam appears in the atlas's own analysis.
Two cities the atlas reads next to Rotterdam — the reason first, then the entries it rests on. Chosen by hand from the Rotterdam threads below, not counted out of them.
Two municipal twins with opposite ambitions — Rotterdam models flooding and what lies under the street, Seoul simulates the whole city — and the same split in their sensors: a neighbourhood testbed against a citywide network.
The same estuary problem, two layers: Hamburg instrumented the port it already had — bridges, locks, the traffic over them — while Rotterdam built the automated terminal and streams the water itself into a twin.
Every editorial link from Rotterdam's entries into another city, strongest first. Each one is a statement about two projects, not about two cities — the three above are the ones the atlas is willing to make at city level.
1001 Smart Cities (2026). “Smart-city projects in Rotterdam, Netherlands.” The Smart City Atlas. https://1001smartcities.org/cities/rotterdam/ (last verified 2026-08-27). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.