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"Connected Highway": Federate IoT Data in Infrastructure DT

Bentley Integrates iTwins with Azure Digital Twins for Single Pane of Glass IoT Application

Software - Hardware Strategies
Published: 27/05/2020

The concept of digital twins is finding new applications in the way that we interact with our critical infrastructure like roads and highways, improving reliability and safety, increasing the movement of people and goods, and creating better value for every dollar spent.

For the Microsoft Build 2020 developer conference, a team from Bentley Systems and Microsoft explained to software engineers and web developers how to federate civil engineering data with Internet of Things (IoT) data to create a “connected highway.” By integrating Bentley’s iTwin Platform and Microsoft’s Azure Digital Twins, the team was able to combine real-time data from air quality and traffic monitoring devices with civil engineering models, maps, and terrain data to create a living digital twin that enables real-time monitoring of critical infrastructure for safety hazards and traffic incidents.

From 0 to 60 in Less than Three Weeks

The Bentley-Microsoft team initiated the project with a virtual one-week hackathon that wired up Azure Digital Twins with Bentley’s iTwin Viewer and iModel.js open-source programming libraries. Next, they federated a model of a section of highway with a reality mesh of the surrounding terrain that had been created from photographs captured by a drone survey. They then connected the IoT data layer to give access to real-time and historic data and analytics. The result: in less than three weeks, the team had a geometrically accurate, visually intuitive and immersive web application accessible from anywhere 24/7 that gives instant access to live highway conditions and sets off alarms when thresholds are exceeded.

Pavan Emani, vice president, iTwin software development for Bentley Systems, said, “iTwin Platform is a developer platform-as-a-service that has a lot of synergies with Azure Digital Twins and complementary capabilities. Users visualize IoT data in our digital twin viewer and can generate insights in Power BI dashboards and Teams. Microsoft’s cloud-first philosophy aligns with ours, and our platforms enable developers to create and deploy digital twin applications in record time. For our integration with Azure Digital Twins and Azure IoT Hub, we went from zero to 60 in three weeks.”

Under the Hood

Bentley’s expertise is in aggregation, alignment, and 3D visualization of complex engineering data, as well as the tracking of change. The front-end of the “connected highway” digital twin runs in a standard web browser and relies on Bentley’s iTwin Viewer for 3D visualization. The back-end cloud services run in Azure and bridge data from multiple data sources. The back-end ingests and normalizes data from 2D computer aided design (CAD) files, 3D building information models (BIM), and geographical information systems (GIS). Projects typically start with the model of their physical environment and then federate data from IoT devices to the model. Azure Digital Twins abstracts the IoT layer and provides APIs, which make it easy for developers to integrate live data.

A significant benefit of the iTwin-Azure Digital Twin integration is the simplification and time saved by developers by automatically generating from the iTwin the digital twin definition language (DTDL) that is required to create the spatial intelligence graph in Azure Digital Twins.

Sam George, corporate vice president, Azure IoT for Microsoft, said, “Bentley makes it easy to build digital twin-based applications for critical infrastructure, smart grid, smart cities, construction, roads, and automotive. Bentley’s iTwin Platform, open APIs, and open-source programming libraries run on Azure and integrate seamlessly with Azure Digital Twins and Azure IoT Hub. Bentley’s iTwin Platform handles complex engineering data, supports 3D visualizations, and can revolutionize the way these projects are planned, built, and operated.”

Are You Twinning?

The complexity (and associated engineering density) of transportation, utility, and industrial assets make them ideally suited to digital twins. Having a 3D (or, better yet, 4D) model is a game changer for a highway, an underground metro system, or industrial plant, for example. More importantly, during design and construction and throughout the asset’s operating life, the 3D model changes over time. Logging that change on the asset’s timeline is vital to understand who-changed-what-and-when. Digital twins provide a foundation for predictive and prescriptive analytics, enabling users to respond quickly to incidents with confidence and even anticipate them and head them off before they arise.

Digital twins have the potential for a myriad of use cases, and no single vendor can possibly address all those use cases or foresee how those use cases will evolve over the next five years. So, it is important for developers to design their applications with flexibility in mind. In software terms, that means open.

Pavan Emani, vice president, iTwin software development for Bentley Systems, said, “What differentiates Bentley is its open approach. Open data and open source mean that users retain control and flexibility. We like to say that the greater the engineering density, the greater value we add. But often, there is great value from simply visualizing engineering data in context. Bringing layers of data together into a single pane of glass, or single view of truth, provides an intuitive way for many people to understand and interact with very complex information.”

Combining ET, IT, and OT

Bentley Systems is a leading global provider of software solutions to engineers, architects, geospatial professionals, constructors, and owner-operators for the design, construction, and operation of infrastructure.

Bentley has a strategic partnership with Microsoft. Monthly active users of Bentley’s cloud-provisioned applications, including digital twins, made Bentley one of the top 25 consumers of Azure in 2019. In both 2018 and 2019, Microsoft named Bentley as Partner of the Year in its CityNext category.

Jerry King, vice president, Strategic Channel for Bentley Systems, said, “Many of Bentley’s users choose Azure as the cloud platform to manage their data. There is a significant overlap in our user base, so it made sense for us to provide the integration of iTwin and Azure Digital Twins and capture synergies. Our goal is to be the infrastructure digital twin platform company. That means combining engineering technologies (ET) with information technologies (IT) and operational technologies (OT) – think of combining CAD, BIM and GIS data with ERP, EAM data and IoT data to form a digital twin. We surface that IoT data using Azure Digital Twins and Azure IoT Hub.”

Editor’s Notes

Bentley’s iTwin Platform is a platform-as-a-service (PaaS) that comprises cloud microservices for managing infrastructure data. It includes cloud microservices for project delivery and asset operations workflows, reality data management, and components catalogs.

An iTwin is an infrastructure digital twin, enabled by technologies from Bentley. An iTwin incorporates different types of data repositories – including drawings, specifications, documents, analytical models, photos, reality meshes, IoT feeds, and enterprise resource and enterprise asset management data – into a living, evergreen digital twin.

iTwin Services are a set of cloud services running in Azure that enable engineering teams and owner-operators to create, visualize, and analyze digital twins of infrastructure assets. iTwin Services enable digital information managers and BIM managers to incorporate engineering data created by diverse design tools into a living digital twin and align it with reality modeling and other associated data, visualize the asset, check status, perform analysis, and generate insights to predict and optimize asset performance.

Azure Digital Twins is a platform-as-a-service (PaaS) targeted at in-house and commercial software development organizations that want to accelerate and simplify the creation of digital twin solutions that require IoT spatial intelligence. Azure Digital Twins enables developers to create models of physical environments, such as office buildings and factories, and the interactions of people, spaces, and devices.

Azure IoT Hub provides a cloud-hosted solution back-end to connect virtually any device. It enables developers to use device-to-cloud telemetry data to understand the state of devices and define message routes to Azure services.

Figure 1: Azure Digital Twins – Connected Highway


Figure 2: Connected Highway – Digital Twin Built with Bentley’s iTwin Platform and Azure Digital Twins


Figure 3: Connected Highway – iTwin Showing Bridge Vibration and Deflection Sensors


Figure 4: Solution Architecture of iTwin – Azure Digital Twins Integration



Jerry King is the vice president of strategic alliances at Bentley Systems and is the global alliance lead for Bentley’s partnership with Microsoft. He works with Microsoft to help co-create, co-market, and co-sell Bentley’s Azure-based offerings to drive incremental revenue growth for both Bentley and Microsoft.

While at Bentley, King has served in various roles, including the global vice president of business development for asset performance, global vice president of utilities and communications, and vice president of engineering information management. King also contributed to the development, launch and progressive sales growth of ProjectWise®, the leading-edge engineering information management solution.

Previously, King served as executive vice president of Jacobus Technology, a Bentley strategic affiliate, from its inception in 1991. Before cofounding Jacobus, King worked for Bechtel Corporation in the Engineering and Construction Technology organization. King is a registered engineer in the State of California and is a member of the National Society of Professional Engineers and the American Association of Civil Engineers.


Pavan Emani is the vice president of iTwin Software Development at Bentley Systems. He is responsible for delivering on the infrastructure digital twin platform, which includes iTwin cloud services, iModel bridges, and iModel.js open source software for Bentley’s end users. He is also a member of the Office of the Chief Technology Officer, helping drive iTwin platform adoption throughout Bentley and partners like Siemens.

While at Bentley, Emani has served in various roles, including leading cloud services and mobile applications development. He has also contributed to the continued development of MicroStation and ProjectWise, both leading design and engineering information management solutions.



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