--- title: "Cities: systems and technologies | Nexus Observatory" description: "Systems and technologies for cities and urban systems: Synthetic aperture radar by band (P, L, S, C, X, Ku, Ka), Interferometric SAR (InSAR)…" url: https://observatory.global/industries/cities/systems/ publisher: Nexus Observatory Inc. updated: 2026-11-02 --- Cities: the city measured block by block: the systems behind it. 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. Relays carry the packets without reading them. 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 console shows the evidence with the alert. 13. Stewards open the south gate and capacity rises. 14. Sensors check that the response worked. 15. Record, proof and action are archived together. 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](https://observatory.global/industries/cities/) / **Systems and technologies** # The systems behind cities. The technologies that carry this industry's observations, ranked against what it needs to observe and drawn from across the spectrum. [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/) 1. Cities · Systems and technologies 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. Needs: street flooding, air quality and urban heat, structural condition of public assets, connectivity for municipal sensors and open data for residents. 2. Platform · Connectivity Private 5G, AI-RAN and orbit, on site Standalone private 5G and O-RAN, AI-RAN on shared accelerated compute, LEO and GEO backhaul and 3GPP direct-to-device, LPWAN and mesh for sensors over kilometres, PTP timing inside the budget, and the spectrum route for each country. Every reading and every change leaves a record that can be checked later. [Connectivity](https://observatory.global/connectivity/) 3. Platform · Sensors & instruments Measurements that carry their own proof Weather and environment stations to WMO practice, RF spectrum sensing in the band, and calibration that is traceable, recorded and repeated. Every value leaves with its metadata, quality flag and provenance. Or buy the observations and leave the hardware to us: Sensing as a Service. [Sensors & instruments](https://observatory.global/sensors/) 4. Platform · Data & licensing Grid data, licensed for your use Research, commercial API, enterprise and government tiers, the licence of every source carried through to every product, routes from licensed to open release, and residency fixed by contract. It is delivered and supported by Nexus Observatory Inc. The evidence travels with the data wherever it goes. [Data & licensing](https://observatory.global/data-products/) 5. Platform · Earth observation & GeoAI The ground, measured and modelled Ground-segment downlink and processing at the edge, drone and imagery campaigns planned to the ground sample distance, site twins measured in 3D, and GeoAI trained and checked against field truth, with the source and licence of every layer in view. [Earth observation & GeoAI](https://observatory.global/earth-observation/) 6. Platform · Field services Survey to decommission, one accountable crew Ground, RF and power surveyed before anything is chosen, installation and commissioning to the plan, a Managed Site run for you, support by plan, training on your own site, and decommissioning with every part recorded. Changes are versioned, tested and reversible. [Field services](https://observatory.global/field-services/) 7. Platform · Digital twins and simulation Model the site before you build it The same design repeats from the first site to the last. It runs on the open Observatory Protocol, so other providers can join. Crews, software and records stay the same as the network grows. Changes are versioned, tested and reversible. [Digital twins and simulation](https://observatory.global/digital-twins/) 8. How it scales One base unit, repeated A programme starts with one base node and the instruments it reads. A station adds power and radio, a site adds a relay, a fleet repeats the proven site across many places, and a network federates fleets through edge and core. Capacity grows by adding units, never by replacing what works. 9. Updates Updates in rings, with rollback Software and configuration reach the fleet in rings: a canary site first, then a few, then all, each ring gated on health and data completeness. A failed gate stops the wave and returns each node to its last good release, without a site visit. 10. Field service One crew, from survey to repair The same crew surveys, installs, commissions, calibrates and repairs, working from the site's own record. Each visit updates it, so the next crew knows exactly what is there, when it was last checked and why it was changed. Spares and references are planned from that history. 11. Failure and recovery When a node fails, the fleet knows first When a node goes silent or a sensor drifts, the node buffers its data, fails over to a second link where one exists, and the alert carries the evidence a responder needs. Nothing is lost and nothing is counted twice. 12. What you get Municipal sensing and connectivity layers City-wide LPWAN or private 5G as a shared layer for public sensors and services. Delivered as managed service, for cities, regional governments. Scale: City-wide. Service levels are written as numbers you can measure on your own dashboard. Changes are versioned, tested and reversible. [Talk to sales](https://observatory.global/contact/sales-enquiry/) 13. Next step Plan a cities deployment Tell us the sites, the measurements and the people who will use them. We reply with a design and a scope for cities. An engineer replies with a survey proposal and a scope, and the plan grows from one site to the network you need, at your pace. [Plan a deployment](https://observatory.global/contact/deployment/) [Open the Studio](https://observatory.global/studio/) [Read the stories](https://observatory.global/stories/) **01** Remote sensing and Earth observation ## Radar, lidar and microwave sensors. **Frontier** · Remote sensing and Earth observation · Radar, lidar and microwave sensors ### GNSS reflectometry Reflected navigation signals for ocean wind, soil moisture and flood extent from low-cost receivers. WMO OSCAR/Space Remote sensing and Earth observation · Radar, lidar and microwave sensors ### Synthetic aperture radar by band (P, L, S, C, X, Ku, Ka) All-weather, day-night imaging; longer bands penetrate vegetation and dry soil, shorter bands resolve detail. IEEE Std 521 (radar band letter designations) · CEOS ARD SAR (Normalised Radar Backscatter) Remote sensing and Earth observation · Radar, lidar and microwave sensors ### Interferometric SAR (InSAR) Phase differences between passes that measure ground and structure motion to millimetres, plus elevation. CEOS ARD SAR (Interferometric Radar, Geocoded Single-Look Complex) · ISO/TS 19159-3 (SAR and InSAR calibration) Remote sensing and Earth observation · Radar, lidar and microwave sensors ### Polarimetric SAR (PolSAR) Full or dual polarisation scattering for crop type, flooded vegetation, sea ice and biomass. CEOS ARD SAR (Polarimetric Radar) Remote sensing and Earth observation · Radar, lidar and microwave sensors ### Ocean radar backscatter and scatterometry Wind, waves, oil slicks, ships and sea ice from radar over water. CEOS ARD SAR (Ocean Radar Backscatter) Remote sensing and Earth observation · Radar, lidar and microwave sensors ### Radar altimetry Height of sea, lake, river and ice surfaces along the ground track for water level and ice monitoring. CEOS Ocean Surface Topography Virtual Constellation [All 10 in this layer](https://observatory.global/technologies/eo/radar-lidar-and-microwave-sensors/) **02** 5G and 6G radio access networks ## Private networks and RAN sharing. 5G and 6G radio access networks · Private networks and RAN sharing ### Standalone non-public networks (SNPN) Fully separate private 5G networks with their own identifiers, core and subscriptions. 3GPP TS 23.501 clause 5.30.2 5G and 6G radio access networks · Private networks and RAN sharing ### Public network integrated NPN (PNI-NPN) Private networks delivered as slices or DNNs of a public network, with closed access groups. 3GPP TS 23.501 clause 5.30.3 5G and 6G radio access networks · Private networks and RAN sharing ### Neutral host networks One shared network that serves several operators' subscribers in buildings, campuses or rural corridors. 3GPP TS 23.251 (network sharing) · 3GPP TS 23.501 (SNPN with credentials from a separate entity) 5G and 6G radio access networks · Private networks and RAN sharing ### RAN sharing (MORAN and MOCN) Operators sharing radios and sometimes spectrum to cut cost in low-density areas. 3GPP TS 23.251 · 3GPP TS 32.130 (network sharing management) 5G and 6G radio access networks · Private networks and RAN sharing ### Industrial 5G LAN and TSN integration Layer-2 group services and time-sensitive networking bridging for operational technology. 3GPP TS 23.501 clauses 5.27 and 5.29 · 3GPP TS 22.104 5G and 6G radio access networks · Private networks and RAN sharing ### Shared and local spectrum for private networks CBRS-type tiered access and local licences that let enterprises and communities run their own networks. FCC 47 CFR Part 96 (CBRS) · ISED non-competitive local licensing framework (3900–3980 MHz) [All 7 in this layer](https://observatory.global/technologies/ran/private-networks-and-ran-sharing/) **03** IoT, LPWAN and mesh ## Low-power wide-area networks. IoT, LPWAN and mesh · Low-power wide-area networks ### LoRaWAN Long-range, low-power star-of-stars networks in licence-exempt bands for sensors over kilometres. LoRaWAN L2 1.0.4 (TS001-1.0.4) · LoRaWAN Backend Interfaces (TS002) IoT, LPWAN and mesh · Low-power wide-area networks ### LoRaWAN Regional Parameters Per-region channel plans, data rates, power limits and duty cycles that a deployment must follow. LoRaWAN Regional Parameters RP002-1.0.4 IoT, LPWAN and mesh · Low-power wide-area networks ### LR-FHSS and LoRaWAN relay Frequency-hopping modulation for dense and satellite links, and relays that extend coverage into shadowed sites. LoRaWAN Regional Parameters RP002-1.0.2 and later (LR-FHSS data rates) · LoRaWAN Relay specification (TS011) IoT, LPWAN and mesh · Low-power wide-area networks ### NB-IoT and LTE-M Licensed cellular IoT with deep coverage, mobility (LTE-M) and operator-managed security. 3GPP TS 36.300 (E-UTRA, Rel-13 onward) · GSMA LTE-M and NB-IoT deployment guides IoT, LPWAN and mesh · Low-power wide-area networks ### Power saving mode and eDRX Cellular sleep and extended paging cycles that set battery life for cellular sensors. 3GPP TS 23.682 (MTC architecture) · 3GPP TS 24.301 (NAS) IoT, LPWAN and mesh · Low-power wide-area networks ### 5G RedCap and eRedCap Reduced-capability NR devices for cameras, wearables and industrial sensors on 5G networks. 3GPP TS 38.300 (Rel-17 RedCap, Rel-18 eRedCap) [All 9 in this layer](https://observatory.global/technologies/iot/low-power-wide-area-networks/) **04** GIS, maps and GeoAI ## 3D, BIM and digital twins. **Frontier** · GIS, maps and GeoAI · 3D, BIM and digital twins ### Sensor-fused live twins Twins updated continuously from sensors, cameras and EO, with provenance on every change. OGC SensorThings API 1.1 · OGC API - Connected Systems **Frontier** · GIS, maps and GeoAI · 3D, BIM and digital twins ### Geospatial augmented reality Overlaying the twin on the real site for crews through located and oriented devices. OGC GeoPose 1.0 GIS, maps and GeoAI · 3D, BIM and digital twins ### City and site models Semantic 3D models of buildings, terrain and infrastructure at defined levels of detail. OGC CityGML 3.0 Conceptual Model GIS, maps and GeoAI · 3D, BIM and digital twins ### 3D Tiles and scene layers Streaming of massive meshes, point clouds and models into web and desktop viewers. OGC 3D Tiles 1.1 (Community Standard) · OGC Indexed 3D Scene Layer (I3S) Community Standard GIS, maps and GeoAI · 3D, BIM and digital twins ### BIM and asset information Building and infrastructure models and information management through design, build and operation. ISO 16739-1 (IFC) · ISO 19650-1 (information management using BIM) GIS, maps and GeoAI · 3D, BIM and digital twins ### Photogrammetry and reality capture Meshes, orthomosaics and point clouds reconstructed from drone and ground imagery. ASPRS Positional Accuracy Standards for Digital Geospatial Data (Edition 2) [All 8 in this layer](https://observatory.global/technologies/gis/3d-bim-and-digital-twins/) **05** Ground segment ## Ground-station-as-a-service and antenna networks. Ground segment · Ground-station-as-a-service and antenna networks ### Shared antenna networks Pay-per-pass access to antennas across many sites so missions do not have to build their own. CCSDS 910.4-B (cross support reference model) · CCSDS 911.1-B (SLE return all frames) Ground segment · Ground-station-as-a-service and antenna networks ### Space link extension services Standard services that deliver frames and accept commands between a ground station and a remote mission centre. CCSDS 911.1-B (RAF) · CCSDS 911.2-B (RCF) · CCSDS 912.1-B (forward CLTU) Ground segment · Ground-station-as-a-service and antenna networks ### Pass scheduling and resource management Booking, deconfliction and configuration of antennas and modems for each contact. CCSDS cross support service management Ground segment · Ground-station-as-a-service and antenna networks ### High-latitude and polar ground sites Northern sites that see polar-orbiting satellites on most orbits and cut data latency. ITU RR Appendix 7 · Rec. ITU-R P.618 Ground segment · Ground-station-as-a-service and antenna networks ### Ground segment cybersecurity Access control, segmentation, monitoring and recovery for command and control systems. NIST IR 8401 (satellite ground segment and the Cybersecurity Framework) · ISO/IEC 27001 Ground segment · Ground-station-as-a-service and antenna networks ### Federated and hybrid ground networks Combining owned, partner and agency antennas behind one scheduling and data interface. CCSDS 910.4-B (cross support reference model) [All 7 in this layer](https://observatory.global/technologies/ground/ground-station-as-a-service-and-antenna-networks/) **06** In situ sensors and instruments ## Air quality and atmospheric composition. In situ sensors and instruments · Air quality and atmospheric composition ### Reference gas analysers Continuous analysers for nitrogen oxides, ozone, carbon monoxide and sulphur dioxide by reference methods. EN 14211 (NOx) · EN 14625 (O3) · EN 14626 (CO) In situ sensors and instruments · Air quality and atmospheric composition ### Particulate matter monitors Gravimetric and automated PM10 and PM2.5 measurement. EN 12341 (gravimetric PM) · EN 16450 (automated PM monitors) · US EPA 40 CFR Part 53 (reference and equivalent methods) In situ sensors and instruments · Air quality and atmospheric composition ### Low-cost sensor systems Dense, cheaper sensor networks evaluated and corrected against reference sites. CEN/TS 17660-1:2021 (sensor systems, gaseous pollutants) · US EPA performance targets for air sensors In situ sensors and instruments · Air quality and atmospheric composition ### Ambient air quality frameworks Regulatory objectives and data quality objectives that set what monitoring must achieve. Directive (EU) 2024/2881 (ambient air quality) · Canadian Ambient Air Quality Standards (CCME) In situ sensors and instruments · Air quality and atmospheric composition ### Greenhouse gas and reactive gas monitoring High-precision carbon dioxide, methane and nitrous oxide analysers on tall towers and baseline sites. WMO GAW measurement guidelines · WMO Global Greenhouse Gas Watch In situ sensors and instruments · Air quality and atmospheric composition ### Aerosol optics and sun photometry Aerosol optical depth, absorption and scattering for smoke, dust and satellite validation. WMO GAW aerosol guidelines [All 7 in this layer](https://observatory.global/technologies/sensors/air-quality-and-atmospheric-composition/) **07** Every domain ## The rest of the spectrum. The domains whose layers serve this industry, each with its full directory. [Layers · 8 · items · 62 5G and 6G radio access networksThe radio access network from site to spectrum: macro, small cells, DAS and repeaters, massive MIMO, NR bands and TDD synchronisation, NR features such as RedCap, positioning and sidelink, private and shared networks, Wi-Fi coexistence, 6G and ISAC, and the planning and assurance that keep it working.](https://observatory.global/technologies/ran/) [Layers · 8 · items · 60 AI-RAN and Open RANDisaggregated, software-defined and AI-assisted radio access: the O-RAN architecture and its open interfaces, 7.2x fronthaul, RAN intelligent controllers with xApps and rApps, SMO and O-Cloud, accelerated L1, shared GPU infrastructure for RAN and AI, AI/ML in the 3GPP air interface, energy saving, and the test and integration work that makes multi-supplier RAN deployable.](https://observatory.global/technologies/airan/) [Layers · 8 · items · 60 Core and transport networksThe networks behind the radio: the 5G core and its functions, slicing and edge breakout, IMS voice and emergency calling, fronthaul, midhaul and backhaul over microwave, E-band, fibre, free-space optics and satellite, IP/MPLS and segment routing, IPv6, automation and intent, and the security that holds it together.](https://observatory.global/technologies/core/) [Layers · 8 · items · 66 Satellite and space systemsThe space segment end to end: orbits and constellations, spacecraft buses, communications and Earth observation payloads, inter-satellite links, tracking and command, space safety, launch, and the licensing and filings that let a system operate over a site.](https://observatory.global/technologies/satellite/) [Layers · 8 · items · 63 Ground segmentEverything on the ground that talks to spacecraft: gateways and teleports, user terminals, modems and software-defined radio, shared antenna networks, CCSDS protocol stacks, mission control, data processing and the spectrum coordination behind each earth station.](https://observatory.global/technologies/ground/) [Layers · 7 · items · 59 Spectrum, timing and PNTThe shared foundations every network and sensor depends on: how spectrum is licensed, shared and monitored, GNSS positioning and its corrections, packet timing with PTP and SyncE, grandmasters and holdover, resilient PNT alternatives, and the detection of interference, jamming and spoofing.](https://observatory.global/technologies/timing/) [Layers · 8 · items · 54 IoT, LPWAN and meshThe radios, networks, gateways, device management and field protocols that connect low-power sensors and controllers to the grid, sized to a measured power budget.](https://observatory.global/technologies/iot/) [Layers · 8 · items · 61 In situ sensors and instrumentsInstruments placed in the air, water, ground and spectrum, from weather stations to seismometers, radars and cameras, with the calibration, metadata and quality control that make their readings evidence.](https://observatory.global/technologies/sensors/) [Layers · 8 · items · 59 Data, software and interoperabilityHow observations move from the edge into stores, catalogues and APIs with their provenance, licence and residency attached, and how they interoperate through open standards and the open Observatory Protocol.](https://observatory.global/technologies/data/) [Layers · 8 · items · 67 Remote sensing and Earth observationEvery platform, sensor, processing level and ground-segment step that turns remote measurements of the Earth into calibrated, analysis-ready evidence for a site, a region or a network.](https://observatory.global/technologies/eo/) [Layers · 8 · items · 65 GIS, maps and GeoAIThe reference frames, formats, services, analysis methods, machine learning and 3D models that turn observations into located, queryable and decision-ready geographic information.](https://observatory.global/technologies/gis/) [Layers · 8 · items · 66 Field operations and lifecycleEverything that happens on the ground across a site's life: survey, permits, design packs, logistics, installation, acceptance, training, operations, maintenance, upgrades, decommission and recycling, done safely and recorded as evidence.](https://observatory.global/technologies/field/) [Layers · 8 · items · 65 AI systemsAI from model to accountable operation: edge inference and model optimisation, foundation models for Earth observation and geospatial work, time-series and sensor AI, multimodal fusion and supervised agentic operations, federated and privacy-preserving learning, physical AI and robotics within stated red lines, MLOps, evaluation and model risk, and the governance frameworks that apply to each.](https://observatory.global/technologies/ai/) ## Bring us the site. Survey, design, deployment and operation for cities. The form names who receives your details. 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