Changes to the openBIM model in a CDE and impact on GIS

The connection between BIM and GIS has enormous potential.

But what happens on the GIS map if the openBIM model data is modified in the Common Data Environment (CDE)?

In fact, the need to modify the BIM model is very frequent. Just think of the recurring changes during the design phase or modifications during construction, or simply the updates that an “as built” model undergoes following maintenance, renovation, etc. over time.

When discussing changes to the openBIM model in the CDE and their impact on GIS, we refer to how modifications made to an openBIM model within a common data environment (CDE) can influence geographic information systems (GIS).

There are applications of geospatial digital twin that closely connect BIM, GIS, and CDE, allowing for the management of these types of changes to the model (geometric and informational) in real-time, optimizing project management and making collaboration between engineers, architects, and surveyors more efficient.

Let’s delve into this topic, which will become increasingly recurring and essential to keep pace with the evolution of the construction sector.

openBIM and CDE: what is it about

By now, BIM has become a well-known concept for all professionals in the construction sector. The term openBIM is also being heard more frequently. What does it refer to? What is the difference between BIM and openBIM?

If you want to know more, before proceeding, read also open BIM what it is and how to put it into practice.

In summary, openBIM refers to the use of open standards (such as IFC, Industry Foundation Classes) for the management and sharing of data related to informational models within the construction industry.
CDE (Common Data Environment) is a centralized digital environment where all project information (documents, 3D models, data) is collected, managed, and shared among various stakeholders throughout the project lifecycle. This tool facilitates collaboration and reduces errors by automatically updating data and keeping it consistent throughout the project lifecycle​.

To implement a fully openBIM process, therefore, it is essential to use the CDE that regulates and facilitates interaction and exchanges among the various figures involved in the process.

Advantages of CDE for openBIM

• Dynamic updates: every change made to the BIM model in the CDE is reflected in real-time across all connected systems, including GIS, ensuring perfect synchronization of information​.
• Interoperability: thanks to the use of open standards like the Industry Foundation Classes (IFC), openBIM models can be used across different software platforms, ensuring smooth collaboration​.

Changes to the openBIM model in CDE and impact on GIS

When a BIM model is modified in a CDE, this can include changes to the geometry and the associated information (materials, structural information, details about systems, etc.). These changes can be minor or significant, affecting the project in various ways.

GIS (Geographic Information System) is a system that manages, analyzes, and visualizes geographic and spatial data. In construction and urban management contexts, BIM models can be integrated with GIS to obtain a comprehensive view of the built and natural environment.

When a BIM model is modified or updated, these variations must also be reflected in the GIS to maintain data integrity and consistency between digital models. For example, if a building is moved, resized, or if the characteristics of its components change, these modifications must also be updated in the GIS to ensure that maps and spatial analyses remain accurate.

In summary, changes made to openBIM models within a CDE can impact how data is represented, managed, and utilized in GIS systems. This integration between BIM and GIS is essential for urban planning, infrastructure management, environmental analysis, and even architectural design.

But how are all these aspects of design managed?

The use of geospatial digital twin platforms is essential, allowing for the management and visualization of changes to openBIM models in a GIS context through an integrated platform that combines the capabilities of BIM with the advanced functionalities of geographic information systems.

usBIM.geotwin, for example, allows you to sync BIM models created and updated in a common data environment (CDE) with a geospatial digital twin (geotwin), enabling real-time monitoring and analysis of structural and design changes in a broader geographic context.

Thanks to the integration of detailed BIM information and GIS spatial data, users can see the impact of model changes on the surrounding environment, improving project management and operational decision-making. This approach ensures that all parties involved have access to updated and consistent information, enhancing collaboration and reducing risks associated with unsynchronized data.

Changes to the openBIM model in the CDE and impact on GIS with usBIM.geotwin

Impact of changes on openBIM model in CDE on GIS

When changes are made to the openBIM model within the CDE, these directly impact the GIS, as the geospatial information is automatically updated to reflect the changes made in the digital model.

• Real-time updates
  Changes can be both geometric and informational. For example, repositioning a structural element in the BIM model results in an immediate update in the GIS map, showing the change in georeferencing in real time. This dynamic and bidirectional approach allows for better planning and resource management, optimizing field operations​.
• Creation of geospatial Digital Twins
  Thanks to the integration between BIM and GIS, it is possible to create Digital Twins that accurately represent infrastructures in their geographical context. These digital models interact with geospatial data in real time, facilitating analysis and planning, especially for complex projects.

Benefits for engineers, architects, and surveyors

What are the benefits of this connection between BIM, GIS, and CDE?

It is easy to see that the benefit lies mainly in:

• Advanced interoperability
  The integration between openBIM and GIS allows professionals to collaborate without worrying about incompatibilities between different software. The use of open standards like IFC enables teams to work simultaneously on the same model, improving the quality and efficiency of the project.
• Geospatial visualization and analysis
  The real-time update of BIM data in GIS offers the possibility to perform advanced geospatial queries, analyzing the interactions between project elements and the surrounding geographical context. For example, it is possible to assess the environmental impact of a structural change or optimize the transportation of materials during construction.

Practical example: changes on openBIM model in CDE and impact on GIS

A concrete example of the synchronization process between BIM and GIS concerns the georeferencing of a building. Suppose a BIM designer moves a window in a 3D model: the change will be immediately reflected in the GIS, allowing other users to see the change in real time on the geospatial map. This continuous flow of information reduces review times and minimizes coordination errors.

Here is a short video where you can see the real-time interaction between a GIS user and a BIM user on the same georeferenced 3D model, directly on the GIS map.

You will see how the changes made to the BIM model are visualized in real time on the GIS map as well. In particular, the video shows two side-by-side browser windows: the first shows the BIM user repositioning the furnishings of their project in space, while the second shows the GIS user simultaneously viewing those changes directly on their GIS map. In this case, the changes made to the BIM model are geometric but could also concern just the data model.

I remind you that changes can be both geometric (involving envelopes, windows, etc. of a single building, or even multiple buildings) and informational (related to the properties and the dataset associated with each individual entity of the model).