--- title: "Cities and urban systems | Nexus Observatory" description: "Street-level flood depth, air quality and heat, mobility and noise, carried on a municipal sensing and connectivity layer…" url: https://observatory.global/industries/cities/ publisher: Nexus Observatory Inc. updated: 2026-11-02 --- Cities: the city measured block by block: the site at a glance. The loop, step by step: 1. Gates open and the stadium starts to fill. 2. Sensor, link, edge and console stand ready. 3. A crowd surge builds toward the north gate. 4. Cameras count the flow at every gate. 5. Each reading is stamped with time and place. 6. Counts reach the edge over the stadium radio. 7. The relay forwards sealed packets untouched. 8. Signatures are checked before any model runs. 9. The edge model estimates density per gate. 10. The edge releases confirmed results only. 11. The control room sees the density map. 12. The alert arrives with its evidence attached. 13. Stewards open the south gate and capacity rises. 14. Instruments confirm the response took effect. 15. The whole chain is archived for audit. 16. The crowd spreads out and the radio relaxes. 01 / 16 Gates open and the stadium starts to fill [Nexus Observatory](https://observatory.global/) / **Cities** # The city, measured block by block. Street-level flood depth, air quality and heat, mobility and noise, carried on a municipal sensing and connectivity layer, with twins of the streets they sit in and open data residents can read. [Plan a deployment](https://observatory.global/contact/deployment/) [Use cases](https://observatory.global/industries/cities/use-cases/) [Open the explainer](https://observatory.global/industries/cities/explainer/) **01** ## In the field [Guided 3D tour City blockSmall cells on street poles, air-quality nodes and heat sensors across four blocks, joined to an edge node that publishes open city data.](https://observatory.global/environments/city-block/) **02** Stories ## How it works, in place. Interactive stories with figures drawn to scale and every claim referenced. [All stories](https://observatory.global/stories/) [Place: Dense city block **The instrumented street** Four city blocks, read as an observing system: small cells on street poles, air-quality and heat sensors beside them, and an edge node that corrects, times…](https://observatory.global/stories/city-block/) [Place: Suburb **The suburb as a power station** Rooftop solar, home batteries and electric vehicles turn a residential street into thousands of small generators. Observing them is how a distribution grid…](https://observatory.global/stories/suburb-grid-edge/) [System: LPWAN and mesh **Kilometres on a coin cell** Most environmental sensors send a few bytes a few times an hour. Low-power wide-area networks trade bandwidth for range and battery life; mesh networks…](https://observatory.global/stories/lpwan-mesh/) **03** Specialized fields ## Cities, field by field. A city is many services on the same streets. The air people breathe, the heat that builds between buildings, the traffic and the people moving through, the public buildings and their energy, the waste collected every day and the noise of the night each measure different things for different departments. Each field below has its own stack, radio, power and crew work, from the first order to the running operation. [Specialized field Urban air qualityReference stations and dense sensor networks for particles and gases, with weather to trace sources, calibrated against each other, on cellular and LoRaWAN, for street-level maps people can trust.The full field →](https://observatory.global/industries/cities/air-quality/) [Specialized field Urban heat and treesStreet-level temperature and humidity across neighbourhoods, tree soil moisture and heat-health alerts, on LoRaWAN across the city, so cooling and watering go where people suffer most.The full field →](https://observatory.global/industries/cities/urban-heat/) [Specialized field Streets and mobilityCounts of people, bikes and vehicles, speeds, kerb use and junction safety by camera and radar processed at the edge, on private 5G and fibre, so streets are planned on evidence and privacy is kept.The full field →](https://observatory.global/industries/cities/street-mobility/) [Specialized field Public buildings and energyEnergy, heat and water meters, indoor air and comfort in schools, offices and pools, with weather for normalisation, on the buildings' own networks behind a security gateway.The full field →](https://observatory.global/industries/cities/public-buildings/) [Specialized field Waste and street servicesBin fill levels, collection routes, transfer station gas and weather, on LoRaWAN across the city, so crews empty what is full and the waste record follows from the work.The full field →](https://observatory.global/industries/cities/waste-services/) [Specialized field Noise and the night-time cityClass 1 noise monitoring at hot spots, event classification at the edge for nightlife, construction and traffic, with weather, on cellular, so complaints are answered with evidence and noise plans work.The full field →](https://observatory.global/industries/cities/noise/) **04** The problem ## What this industry has to measure. Air quality, noise, traffic, urban heat and street flooding, with open data as a procurement credential. **01** Street flooding **02** Air quality and urban heat **03** Structural condition of public assets **04** Connectivity for municipal sensors **05** Open data for residents **05** Outcomes and proof ## What you get, and how you can check it. Every system we deliver comes with the evidence a buyer, an auditor or a regulator asks for. What you can measure - **Street flooding** - **Air quality and urban heat** - **Structural condition of public assets** - **Connectivity for municipal sensors** - **Open data for residents** Proof buyers ask for - Co-location calibration reports against reference monitors - Data-completeness service levels - An open-data API - A privacy impact assessment for video and probe sensing - Accessible dashboards - Survey accuracy (GSD, check points) - Deformation precision - Method statements **06** Use cases ## Where it is deployed. Worked use cases and deployment scenarios. Open one for the kit, the data products and the standards. [Use case · low complexity Street flood observatoryUltrasonic depth sensors on poles report street-level water depth as open data and alerts.WhoCities, emergency management agencies and universities.DataStreet-level water depth time series; Open data feed and alerts to emergency management and 311OGC SensorThings API 1.1 Municipal open-data terms The full use case →](https://observatory.global/use-cases/street-flood/) [Use case · low to medium complexity Hybrid air-quality observatoryA few reference analysers and many low-cost nodes, with co-location calibration and an open-data feed.WhoCities, public-health units, school districts.DataAir-quality index and hyperlocal maps, labelled supplementary; Calibrated time series with quality flags; Publication route to an open air-quality aggregatorEU Directive 2024/2881 (ambient air quality) CEN/TS 17660 (sensor systems) US EPA FEM/FRM reference methods The full use case →](https://observatory.global/use-cases/hybrid-air-quality/) [Cities Hybrid air-quality networkReference analysers plus calibrated low-cost nodes; low-cost sensors alone do not meet regulatory requirements.The full use case →](https://observatory.global/use-cases/hybrid-air-quality/) Cities ### Municipal low-power radio or private 5G layer A city-wide connectivity layer as digital public infrastructure. [Every use case](https://observatory.global/industries/cities/use-cases/) **07** Solution bundles ## Start with one unit. Grow to a network. The same systems at every scale, on the open protocol, so nothing you buy is replaced as you grow. 1. **01** Base unit One station or node, specified for this industry: instruments, power, enclosure and backhaul. [Build a station →](https://observatory.global/studio/builder/) 2. **02** Site A surveyed, commissioned site with its timing, its links and the evidence file a buyer can audit. [Plan a site →](https://observatory.global/contact/deployment/) 3. **03** Fleet Many sites run as one service: one plan, one update path, one evidence trail, one service level. [Managed offers →](https://observatory.global/industries/cities/solutions/) 4. **04** Network Fleets that federate with partner grids through the open protocol, owner by owner. [The open protocol →](https://observatory.global/protocol/) **08** Solutions ## What we deliver. Each offer is designed, deployed and run on the open protocol by Nexus Observatory Inc. managed service, data licence ### Hybrid air-quality networks Reference analysers plus calibrated low-cost nodes, with co-location calibration and an open-data interface. [How we deliver it →](https://observatory.global/industries/cities/solutions/#air-quality-networks) professional services, data licence ### Drone survey and 3D site twins Survey campaigns planned to the ground sample distance, photogrammetry and LiDAR, and site twins kept current. [How we deliver it →](https://observatory.global/industries/cities/solutions/#drone-twins) managed service, data licence ### Structural and ground-movement monitoring GNSS, InSAR, tilt, strain and fibre sensing on bridges, dams, slopes, tailings and pipelines, with alert thresholds set by the owner. [How we deliver it →](https://observatory.global/industries/cities/solutions/#infrastructure-monitoring) managed service ### Municipal sensing and connectivity layers City-wide LPWAN or private 5G as a shared layer for public sensors and services. [How we deliver it →](https://observatory.global/industries/cities/solutions/#municipal-connectivity) **09** Service platforms ## The platforms behind it. The service platforms that build the systems this industry runs on. [Service platform ConnectivityPrivate 5G, AI-RAN and orbit, on site.](https://observatory.global/connectivity/) [Service platform Sensors & instrumentsMeasurements that carry their own proof.](https://observatory.global/sensors/) [Service platform Data & licensingGrid data, licensed for your use.](https://observatory.global/data-products/) [Service platform Earth observation & GeoAIThe ground, measured and modelled.](https://observatory.global/earth-observation/) [Service platform Field servicesSurvey to decommission, one accountable crew.](https://observatory.global/field-services/) [Service platform Digital twins and simulationModel the site before you build it.](https://observatory.global/digital-twins/) [How each platform serves this industry](https://observatory.global/industries/cities/platforms/) **10** Standards and compliance ## Drawn against the standards your auditors use. Standards the systems are drawn against - OGC SensorThings API 1.1 - Municipal open-data terms - EU Directive 2024/2881 (ambient air quality) - CEN/TS 17660 (sensor systems) - US EPA FEM/FRM reference methods Regulation and authority - **Spectrum and siting** Licences, permits and siting are part of the plan, country by country. [Country notes →](https://observatory.global/industries/cities/countries/) - **Privacy and data** Your data stays yours, under the licence you choose. [Privacy notice →](https://observatory.global/legal/privacy/) - **Security** Hardware-rooted identity and signed updates on every device. [Security →](https://observatory.global/security/) **11** Questions buyers ask ## Before you scope it. Who sells, and who owns the data? Nexus Observatory Inc. is the seller of record. The data your systems collect stays yours, under the licence you choose. Do we have to buy hardware? No. We deliver as a managed service, a data licence or a system you own. Can we start small? Yes. Start with one station or one site, then grow to a fleet and a network on the same open protocol, without replacing what you bought. Which standards do the systems meet? Each system is drawn against the open protocol and the standards it is composed from, listed on this page. What happens after go-live? We run the systems to a written service level, with monitoring, repair and an evidence trail, or train your team to run them. ### Ready when you are. Plan a deployment, configure a station or talk to sales. Every request reaches the team that answers it. [Plan a deployment](https://observatory.global/contact/deployment/) [Station Builder](https://observatory.global/studio/builder/) [Talk to sales](https://observatory.global/contact/sales-enquiry/) **12** Open and community ## Open by default. Built with the people who use it. Open data, open methods and the open protocol, with the people who use them. Open projects this community builds on - Sensor.Community - OpenAQ - FloodNet - Smart Citizen Kit - Telraam - openSenseMap Take part - [Join the community, one account for the whole network](https://observatory.global/industries/cities/community/) - [Use the open methods and templates](https://observatory.global/industries/cities/open/) - [Follow a learning path](https://observatory.global/industries/cities/resources/) - [Read the country notes](https://observatory.global/industries/cities/countries/) **13** Public and civic ## Neighbouring industries. [Industry Public safetyWarning time, gained at the sensor.](https://observatory.global/industries/public-safety/) [Industry GovernmentNational observing infrastructure, delivered as one programme.](https://observatory.global/industries/government/) [Industry Civil resilienceInfrastructure that reports before it fails.](https://observatory.global/industries/resilience/) [Industry CommunitiesConnectivity and observation the community owns.](https://observatory.global/industries/communities/) [Industry HumanitarianObservation where the need is greatest and the grid is thinnest.](https://observatory.global/industries/humanitarian/) ## Bring us the site. Survey, design, deployment and operation for cities. The form names who receives your details. [Talk to us](https://observatory.global/contact/) [Plan a deployment](https://observatory.global/contact/deployment/) [Home](https://observatory.global/industries/cities/) [Use cases](https://observatory.global/industries/cities/use-cases/) [Specialized fields](https://observatory.global/industries/cities/fields/) [Solutions](https://observatory.global/industries/cities/solutions/) [Platforms](https://observatory.global/industries/cities/platforms/) [Systems and technologies](https://observatory.global/industries/cities/systems/) [Frontier](https://observatory.global/industries/cities/frontier/) [Open](https://observatory.global/industries/cities/open/) [Community](https://observatory.global/industries/cities/community/) [Countries](https://observatory.global/industries/cities/countries/) [Resources](https://observatory.global/industries/cities/resources/) [Contact](https://observatory.global/industries/cities/contact/) [Nexus Observatory](https://observatory.global/)**Cities** . The city, measured block by block.[Talk to us](https://observatory.global/contact/) Cities - [Overview](https://observatory.global/industries/cities/) - [Explainer](https://observatory.global/industries/cities/explainer/) - [Specialized fields](https://observatory.global/industries/cities/fields/) - [Use cases](https://observatory.global/industries/cities/use-cases/) - [Solutions](https://observatory.global/industries/cities/solutions/) - [Platforms](https://observatory.global/industries/cities/platforms/) - [Resources](https://observatory.global/industries/cities/resources/) - [Contact](https://observatory.global/industries/cities/contact/) Platforms - [Observatory Protocol](https://observatory.global/protocol/) - [Protocol & Grid](https://observatory.global/grid-services/) - [Software](https://observatory.global/software/) - [Hardware & power](https://observatory.global/hardware/) - [Sensors & instruments](https://observatory.global/sensors/) - [Connectivity](https://observatory.global/connectivity/) - 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