What is AR Civil Engineering? Augmented Reality Technology Revolutionizing the Construction Industry

Table of Contents

• What is AR civil engineering

• Benefits of AR technology in construction

• Use cases of AR on construction sites

• Challenges and key points for AR adoption

• Future outlook of AR civil engineering

• What is simple surveying with LRTK

• FAQ

What is AR civil engineering?

AR civil engineering refers to the application of AR (Augmented Reality) technology in the fields of construction and civil engineering. AR is a technology that overlays digital content such as 3D models and text information onto the real world as seen through a camera or smart glasses. For example, simply pointing a smartphone or tablet at a site can overlay a 3D model of the design or construction-related information onto the actual scene in real time.

Traditionally, construction sites confirmed progress and work contents by comparing drawings and photos. However, by adopting AR civil engineering, digital information can be directly confirmed on site in a visible form, significantly changing site management. With AR, it is possible to intuitively "visualize" construction progress on the spot, compare design data with actual construction to prevent mistakes before they occur, and share completed-image expectations between clients and contractors to smooth communication. Because of these various effects, AR technology is attracting attention in the civil engineering industry as an innovative tool supporting "construction DX" (digital transformation of construction).

Benefits of AR technology in construction

Using AR technology on construction and civil engineering sites brings many unprecedented benefits. Here are the main advantages.

Real-time visualization of construction progress

By using AR, you can overlay design models and schedule information onto the actual site, allowing you to grasp at a glance how far the work has progressed. For example, if you display a completed 3D model over a structure under construction with AR, you can intuitively check the work done (the completed area) on site and immediately recognize discrepancies from the plan. As a result, you can consider adjustments to the schedule or adding workers early on as needed, helping to prevent delays. Being able to visualize progress in real time directly contributes to shortening construction periods and reducing unnecessary costs.

Reduction of construction errors and improvement of quality

By working while comparing AR-displayed 3D design data with the actual site, construction mistakes and surveying errors can be detected on the spot. For example, in rebar placement work, overlaying the reinforcement plan at actual scale with AR makes it possible to instantly check discrepancies in number and spacing. Mistakes in buried pipes or structural dimensions that were hard to notice until after completion can be discovered during construction, greatly reducing rework. There are actual reports that "by overlaying design drawings onto the real structure during construction, construction defects could be corrected early," and strengthening on-site quality control with AR directly leads to productivity improvements.

Smoother information sharing

AR technology dramatically improves on-site communication. By overlaying a 3D model of the completed image onto the real scene on a tablet screen, stakeholders with different roles—clients, contractors, designers, and site workers—can all share the same vision of the finished product. Completion images that were hard to convey with drawings or words alone can be understood intuitively when shown visually with AR. This helps prevent rework or troubles caused by "differences in perception" and smooths consensus building with clients. In large projects, holding online meetings using AR models allows stakeholders to review site conditions remotely, reducing the number of business trips and on-site inspections.

Improved efficiency and safety

AR use can greatly increase on-site work efficiency and contribute to improved safety. For example, checks of as-built shapes that used to require surveying instruments and many workers can be carried out by fewer people and in less time with AR. In one case at a major construction company, a smartphone AR app was used by one person to measure the volume of embankment or excavated soil and display the results on the spot; they could survey up to a maximum area of 1000 m² with an error of only a few percent and reduced work time by more than 90% compared to conventional methods. Furthermore, if you visualize the operating range of heavy machinery and no-entry areas on AR, you can alert site workers and improve safety management. In this way, AR contributes to creating an efficient and safe construction environment.

Use cases of AR on construction sites

Now let's look at how AR technology is actually used in construction and civil engineering sites by scene.

AR use in the design and planning stages

In the early planning and design stages of a project, AR helps share the completed image. Traditionally, designers, contractors, and clients used 2D drawings and scale models to align their visions. However, projecting a life-size predicted completion model of a building or structure onto the actual site with AR allows three-dimensional confirmation of details and eliminates recognition gaps. For example, when building a house on an empty lot, displaying the planned house model on site with AR and explaining it to the client and neighboring residents allows them to intuitively understand images that are difficult to convey on paper drawings. This smooths consensus building with the client and stakeholders and helps prevent pre-construction troubles. Also, because you no longer need to repeatedly remake physical models in trial and error, you can expect cost and resource savings in design simulation.

AR use in construction management

On actual construction sites, AR plays an active role in progress management and precise work instructions. Heavy equipment operators can display the target finished terrain model of an earthwork site via tablet AR and perform excavation or embankment work while checking heights and slopes. This allows less experienced workers to perform accurate work without relying on intuition, enabling reproducible work that does not depend on veteran intuition or experience. For construction managers, visualizing foundation layout positions or the placement positions of structures with AR makes marking out work (sumi-dashi) that used to rely on veteran eyes more efficient. There are success stories in road and bridge construction where structures were installed with the accuracy specified in the drawings by working based on AR-displayed design models. Also, site layouts (location of temporary fences, heavy machinery, and material placement) change as work progresses, but always displaying the latest layout plan with AR makes it easier to secure routes for machinery and vehicles. This not only reduces rework but also helps with safety management during heavy equipment operations (for example, indicating no-entry zones with AR), improving overall site productivity and safety.

AR use in infrastructure maintenance and inspection

AR is also beginning to be used in the maintenance and management of infrastructure such as roads, railways, and bridges. Traditionally, inspections involved visually checking the site while referring to drawings and past records, but AR allows past design drawings and repair histories to be overlaid on the actual structure in front of the inspector. For example, in bridge periodic inspections, AR can overlay the bridge drawings and markers of previously repaired areas on the actual bridge, allowing inspectors to immediately identify "where the crack repaired last time is." Inspectors can check for anomalies without overlooking anything and quickly decide on necessary repairs. In railway maintenance, there are initiatives to display the routes of underground buried cables or internal wiring of signaling equipment as see-through diagrams with AR. This reduces the risk of damaging underground utilities during excavation and enables safe and efficient maintenance. Additionally, displaying cautionary messages or inspection procedures in workers' view via AR helps prevent human error. Introducing AR into infrastructure inspections is a powerful solution for achieving both operational efficiency and safety assurance.

AR use in surveying

Surveying work is also being revolutionized by AR technology. Traditionally, to construct according to design drawings, it was necessary to set reference points with transit or marking tools and mark the ground with stakes or chalk. With AR, you can walk the site with a tablet in hand and place virtual "stakes" or "strings" at desired points. Even on sloped terrain or in areas with obstacles, you can measure target points from a distance and display virtual stakes there, allowing accurate positioning even where physical access is difficult. Also, by overlaying point cloud data of the current site obtained in advance by drone or laser scanner with the design 3D model in AR, you can verify on site whether the design plan fits the terrain. The use of AR plus positioning technology dramatically improves surveying efficiency and contributes to increased precision in construction planning and reduced rework. In fact, sites that introduced AR-compatible high-precision positioning systems have seen surveying and marking work that used to take several days completed in a few hours. AR is becoming a new-era tool for surveyors to instantly visualize and share measured data.

Challenges and key points for AR adoption

Although AR civil engineering offers many benefits, there are several challenges and points to consider when adopting it. First, equipment and data preparation for use are necessary. Basically, modern smartphones and tablets released in recent years support AR features, but for applications requiring precision, high-precision GNSS receivers or dedicated AR glasses are sometimes combined. Also, 3D data (BIM/CIM models, point cloud data, etc.) for AR display must be prepared. Preparing these data to match the site requires efforts from the design stage and digitization of existing drawings.

Next, improving IT literacy and training site staff is also a key point. Workers unfamiliar with new technology will need training on how to operate AR devices and how to use them. However, not only younger workers familiar with smartphones but also veteran workers are increasingly accepting AR due to its intuitive operability. With simple UI apps and Japanese-language guidance that prevent confusion on site, many companies are developing AR systems that are easy to use, and widespread adoption as "tools anyone can use" is expected.

Concerns about accuracy and reliability are also gradually being resolved. Early smartphone AR sometimes suffered from misalignment, but in recent years, improved onboard sensor performance combined with external GNSS and proprietary algorithms has made accurate alignment possible. For example, systems like the LRTK described below can synchronize models and the real world with high precision without complex on-site calibration. Furthermore, the Ministry of Land, Infrastructure, Transport and Tourism promotes i-Construction, which advocates productivity improvement through ICT use, making it easier to receive public support for AR adoption as part of that effort.

Considering these challenges, if you clarify your objectives and introduce AR step by step, the benefits of AR civil engineering can be significant. Start by testing AR on small-scale sites or specific processes to verify effects, accumulate know-how, and then expand operations. By incorporating feedback from the field and improving systems, AR can become a powerful tool.

Future outlook of AR civil engineering

As AR technology advances, its range of applications in the construction industry is expected to expand further. On the hardware side, in addition to the current mainstream tablets and smartphones, if AR-compatible smart glasses and helmet-integrated devices become widespread, workers will be able to view AR information hands-free at all times. That would eliminate the need to stop work to look at drawings on site, leading to dramatic improvements in safety and efficiency.

On the software side, AR applications tailored to construction industry needs are likely to increase. Advanced functions such as automatically detecting construction defects from camera images and highlighting them in AR by integrating AI technologies are becoming feasible. Moreover, integration with BIM/CIM and digital twins could lead to AR being used across the entire lifecycle of buildings—from design and construction to maintenance and management.

In terms of human resources, AR can also contribute to skills transfer and alleviating labor shortages. By visualizing veteran craftsmen’s tacit knowledge with AR and providing real-time navigation to newcomers on site, less experienced workers can perform high-quality work. This is expected to be a solution to the decline in veteran craftsmen.

Administrative support is also a tailwind. As exemplified by the Ministry of Land, Infrastructure, Transport and Tourism’s i-Construction initiatives, the industry is promoting ICT and AR adoption, and construction standards and educational curricula premised on AR adoption may be developed in the future. It is possible that "AR-ready construction sites" will become the norm and that traditional methods relying on drawings and surveying instruments will be overhauled. AR civil engineering will increasingly assert itself as the key to DX in the construction industry.

What is simple surveying with LRTK

One solution to realize AR civil engineering is LRTK. LRTK is an advanced AR-compatible RTK-GNSS positioning system provided by Lefixea that is characterized by the ease of use of simply attaching a small high-precision antenna to a smartphone (for example, an iPhone or iPad). Normally, using AR accurately on site requires time-consuming calibration to align the real object and the digital model, but LRTK uses satellite positioning (GNSS) to continuously synchronize the model and the real world, so there is no need to perform coordinate alignment on site. Even when a user moves around the site, the AR-displayed model does not float or shift; it appears stably as if it actually exists there.

With this mechanism, for example, even in places where visibility is poor due to vegetation, you can pinpoint and visualize target reference points or structures, dramatically improving marking and surveying efficiency in complex terrain. With LRTK, anyone can perform surveying and AR tasks with one smartphone per person, making work that previously required specialized skills easy to carry out. In fact, LRTK has already become quietly popular in civil construction management sites and is highly regarded for its ease of use and usefulness. As a solution that meets the high-precision positioning needs in construction and surveying, the LRTK series is compatible with the Ministry of Land, Infrastructure, Transport and Tourism’s i-Construction and greatly contributes to improving on-site productivity.

By introducing simple surveying with LRTK, you can perform everything from capturing as-built data to comparing with design models and even taking record photos on a smartphone—without relying on expensive dedicated surveying equipment or large-scale manual work. If you want to easily try the effects of AR civil engineering on your projects, consider tools like LRTK first. For those interested, please see the detailed information and case studies published on the [LRTK official site](https://www.lrtk.lefixea.com). By utilizing cutting-edge AR positioning technology, you can bring a new wave of "visualization" and efficiency to your site.

FAQ

Q: What is the difference between AR and VR? A: AR (Augmented Reality) overlays digital information onto the real world, allowing users to receive information while viewing real scenery. VR (Virtual Reality), on the other hand, immerses users in a completely digital virtual space; users wear headset-type goggles and experience a world separated from reality. In construction, AR is more useful because it can display information in real time and interact with the real environment.

Q: What is needed to use AR on construction sites? A: With a relatively new smartphone or tablet, you can use basic AR functions by installing a dedicated AR app. For applications requiring higher precision, you may connect a high-precision GNSS antenna (such as devices like LRTK) to the smartphone or use dedicated AR-compatible smart glasses. Also, 3D design data (BIM/CIM models) and drawing data to be displayed on site are required, so preparing such digital materials is important.

Q: Is the cost of introducing AR high? A: Although XR technology in construction is often imagined as expensive, AR using smartphones and tablets can be introduced at relatively low cost. For example, you can start without additional equipment costs by using free or low-cost commercial AR apps. On the other hand, introducing dedicated surveying AR systems or smart glasses requires a certain initial investment. However, these are often inexpensive compared to heavy machinery or large surveying instruments, and they are becoming affordable for small and medium-sized companies. Implementation costs vary by use and scale, but AR using smartphones is generally cost-effective.

Q: How much efficiency improvement can AR bring? A: The degree of efficiency improvement depends on the case, but some examples report dramatic results. For instance, in AR-based earthwork volume measurement, work was completed in less than one-tenth the time compared to conventional methods, and there are also cases where rework due to errors was significantly reduced by AR-based construction checks. Progress reporting and meetings can reduce travel time through AR-based online sharing, so overall work efficiency and productivity can improve by tens of percent. However, to maximize benefits, it is important to operate in a way that fits the site and ensure staff proficiency.

Q: What is LRTK? A: LRTK is a positioning and visualization system for the construction industry that combines high-precision GNSS positioning technology with AR. By attaching a dedicated antenna to a smartphone, you can obtain your position and object coordinates with centimeter-level accuracy (half-inch accuracy). Based on that positional information, BIM/CIM models can be accurately overlaid onto real space, simplifying surveying and construction management on site. In short, with LRTK you can easily perform high-precision surveying without specialized surveying instruments and visualize that data on site with AR. It is a compact tool that each site worker can use and is an attention-grabbing technology supporting DX on construction sites.