AR Civil Engineering Is Exactly What Rural Construction Sites Need! The Potential of Regional Infrastructure DX

Table of Contents

• What is AR civil engineering?

• Benefits of using AR on construction sites

• Why DX is especially needed at rural construction sites

• The potential of regional infrastructure DX opened up by AR

• Domestic examples of AR civil engineering

• Points for SMEs to introduce AR

• Introduction to simple surveying with LRTK

• FAQ

What is AR civil engineering?

AR civil engineering refers to efforts to utilize AR (augmented reality) technology at civil engineering and construction sites. AR technology allows digital information such as design drawings, 3D models, and survey data to be overlaid on the real landscape as seen through a camera. For example, simply pointing a smartphone or tablet can display the appearance of a completed structure at the actual site or visually present instructions tailored to the current progress. In recent years, AR use in the construction and infrastructure sectors has rapidly advanced, and it is attracting attention as one of the innovative technologies supporting “construction DX” and “infrastructure DX.”

Traditionally, sharing design drawings or completion images on site required preparing perspective drawings or models, or relying on veterans’ experience to imagine the finished form from 2D drawings. With AR, however, you can project a 3D model to scale directly onto the site, allowing intuitive grasp of the finished image. This can reduce misreading of complex drawings and is expected to have a major effect on preventing construction errors and smoothing communication. Also, unlike VR (virtual reality), AR lets you view digital information while seeing the real landscape, making it suitable for assisting on-site work. This fusion of AR technology and civil engineering construction, called “AR civil engineering,” is an emerging trend and is becoming a trump card for improving on-site productivity and ensuring quality.

Benefits of using AR on construction sites

Introducing AR into civil engineering and construction sites brings various benefits. Below are the main effects and use scenarios.

• Smoother consensus building: If AR projects the expected completion at full scale on site, explanations to local residents and clients become far easier to understand. In road widening projects, for example, experiencing the post-construction road shape and scenery on site helps alleviate concerns and questions, making consensus building with residents smoother. Incorporating AR into public briefings during the planning stage can intuitively show future conditions that are hard to convey with explanatory materials alone, deepening understanding.

• Verification of as-built condition and quality: AR is also useful for checking differences between the as-built condition and the design on the spot. For example, overlaying a color-coded heatmap that shows elevation errors of embankments or pavements on site makes it immediately clear which areas are higher or lower than designed. Previously, level surveys and report preparation took time, but with AR you can visualize inspection results instantly while standing on site. This enables reduction of rework and streamlining of quality inspections, and makes explanations to clients easier.

• Schedule management and safety checks: Displaying construction progress and heavy equipment placement plans on site with AR allows intuitive interference checks and safety confirmations for each stage. AR display of 4D simulations (construction plans including time axis) enables on-site confirmation of the positions of parts to be installed next and equipment movement paths, helping predict and avoid hazards. This leads to improved construction plan accuracy and thorough safety management. For complex projects, pre-simulating with AR can optimize procedures and reduce risks.

• Use in education and training: AR is effective for training young engineers and safety education. Initiatives that reproduce simulated cases (e.g., improper construction or past disaster situations) on the actual site using AR as training material have begun to appear. Work procedures that are hard for newcomers to imagine can be visually demonstrated with AR, deepening understanding and aiding skill transfer. Also, veteran techniques and points of caution can be shared via videos with AR markers, applying AR to knowledge transfer on site. Additionally, exhibiting AR completion images during site tours can serve public relations to local residents and promote the appeal of civil engineering.

Through such AR use, improvements in productivity and quality and safety assurance are expected across a wide range from pre-construction to construction, education, and public relations. Especially for staff with little site experience, visually based information makes decision-making easier, so effects like reduced human error and smoother communication are particularly significant.

Why DX is especially needed at rural construction sites

The effects of AR technology are needed not only for large projects in big cities but particularly for rural construction sites. Rural small and medium-sized construction companies and municipal infrastructure works face issues such as the following, making it urgent to promote DX (digital transformation).

• Labor shortage and aging workforce: In rural areas, young people leaving the construction industry is a serious problem, and aging of skilled workers who handle sites is progressing. As a result, labor shortages have become the norm and each person’s workload increases. To maintain quality with limited personnel, efficiency and labor saving are indispensable. Digital technologies including AR can serve as means to expand tasks that a small number of people can handle and standardize skills, helping mitigate labor shortages.

• Lagging operational efficiency and information sharing: At rural sites, drawings and schedule management are sometimes paper-based, and information coordination with head offices or offices can lag. This leads to rework and errors, hampering productivity improvement. By introducing DX, centralizing information on the cloud and enabling reporting from the field via mobile devices reduces time lags between remote locations. Especially with AR, the field and the office can share information from the same perspective, allowing accurate communication of site conditions even from afar.

• Difficulty in transferring skills: In rural areas, transferring skills from veterans to young staff is a major challenge. It is difficult to convey experience-based intuition and know-how through words alone, and quality degradation with generational change is a concern. Using DX technologies such as AR and video to visualize veteran perspectives and create mechanisms to share on-site points makes it easier for young people to understand. Incorporating technology into a culture of “learning by seeing” can enhance educational effects.

• Cost and scale constraints: Small-scale projects in rural areas often have low profit margins per site, so companies tend to be cautious about investing in the latest technologies. However, not adopting DX risks losing competitiveness in the future. The Ministry of Land, Infrastructure, Transport and Tourism supports digitalization by providing subsidy and award systems for local companies’ ICT construction and infrastructure DX (such as the "Infrastructure DX Awards"). It is important to proceed with DX by introducing affordable, high-impact tools incrementally to keep costs down.

For these reasons, the impact of DX is greater at rural construction sites, and expectations for AR technology that can transform on-site work are particularly high. Increasing what can be done with digital tools including AR is effective for ensuring quality and conducting safe construction with fewer people. Cases of DX originating in rural areas are increasing; the next chapter looks at specific uses of AR civil engineering.

The potential of regional infrastructure DX opened up by AR

AR technology offers great potential for maintaining and improving rural infrastructure. For example, in inspecting and repairing aging bridges and roads, overlaying past inspection data and drawings on site with AR enables even less experienced staff to check without missing details. If municipal staff can simply hold up a tablet and see information from the last repair displayed on deteriorated parts of a bridge, efficient maintenance management becomes possible.

AR is also useful in disaster prevention and response. Photographing damaged locations after a disaster and overlaying restoration plans or temporary road routes for on-site review speeds up decision-making. In rural areas with widespread and mountainous infrastructure, combining drone aerial photography or satellite positioning to generate AR maps and share them among stakeholders enables accurate situation awareness and directives even from remote locations. This improves the efficiency of managing infrastructure over large areas with limited personnel.

Moreover, AR is powerful in terms of collaboration with local residents. For example, during road work, explaining detours and construction periods to residents is easier if AR compares current and post-construction road conditions. For local people to be positively cooperative about infrastructure projects, visualized transparency is important, and AR is a means to achieve that. For small local projects especially, resident understanding can greatly affect the smoothness of construction, so the significance of AR use is considerable.

In short, AR is not just a cutting-edge technology but a key to realizing regional infrastructure DX. It digitally complements and strengthens parts that relied on on-site intuition and experience, helping to carry out high-quality infrastructure development and maintenance with fewer people. Going forward, AR civil engineering introduction is expected to accelerate even among local governments and small and medium-sized construction firms, bringing dramatic efficiency gains and sophistication to regional infrastructure maintenance and renewal.

Domestic examples of AR civil engineering

In Japan, numerous cases of AR civil engineering that have produced results are being reported. Here are some representative examples.

• Use in municipal road construction: In an intersection improvement project in the Tohoku region, AR glasses (transparent headsets) were linked with an auto-tracking surveying instrument to achieve high-precision AR display across a wide site of about 220 m (721.8 ft) with an overlay error of around 5 mm (0.20 in). Projecting the road and roadside gutter shapes to scale on site, they used it for as-built verification and resident briefings, which dramatically improved the reliability of explanations. Since residents could imagine the post-construction road while standing on site, anxieties were alleviated and consensus building proceeded smoothly. Discussions related to design changes were also completed in a short time, contributing to improved operational efficiency.

• BIM-based AR by a major construction company: One major domestic general contractor developed its own AR system that overlays BIM/CIM 3D models on camera images on a tablet and conducted pilots at multiple sites. At renovation sites, AR was used to visualize normally hidden parts such as pipes and beams above ceilings, enabling identification of concealed equipment without demolition. As a result, pre-checks for interferences became easier and rework was reduced. Workers could confirm drawing information on tablets while performing tasks, contributing to reduced construction errors and more efficient construction management. Sharing information among multiple specialist contractors became easier, strengthening overall site coordination.

• AR use at a rural dam project: At the Naruse Dam project in Higashinaruse Village, Akita Prefecture, the adjacent PR facility “DX LABO” held AR exhibits combined with a diorama model and full-scale AR experiences. A system allowing visitors to experience the dam’s completion image via their smartphones on site was created to encourage local understanding and attachment to the project. This opened advanced civil engineering technology to local residents, enhancing social consensus building and publicity effects. It was also used for completion tours and tourism promotion, and the series of initiatives drew attention in 2024.

• Inspection efficiency using as-built heatmaps: A construction software company in Fukui Prefecture developed AR heatmap technology that color-codes as-built errors in pavements and embankments. With this, simply holding a tablet over the site right after construction instantly reveals height and shape deviations. Previously, as-built management required time-consuming surveying and analysis, but after introducing AR heatmaps, the effort and time required for inspections were drastically reduced. Being able to show data to clients on the spot increased trust and enabled quick responses to change requests. Because even non-experts can judge conditions by color differences, it has been effective in standardizing and reducing labor for quality control.

• AR rebar inspection by an SME: A regional construction company in Hokkaido introduced a rebar inspection system using an iPad’s AR functions and LiDAR sensor. This system automatically judges rebar spacing and counts from on-site photos, dramatically improving the efficiency of rebar checks that used to rely on manual labor. The ability to perform accurate measurements with a general-purpose tablet was highly evaluated and earned a commendation in the Ministry of Land, Infrastructure, Transport and Tourism’s “Infrastructure DX Awards.” This is a good example of a local SME achieving results with AR, directly contributing to productivity improvements at sites suffering from labor shortages.

As these cases show, AR civil engineering is already demonstrating concrete effects at the field level. Benefits such as precise as-built verification through accurate alignment, improved quality of information sharing, enhanced resident understanding, and streamlined inspection and surveying tasks are emerging. Adoption is expanding broadly from large companies to local SMEs, and the technical barriers have lowered compared to before. Going forward, these success stories are likely to spread and accelerate DX across the civil engineering industry.

Points for SMEs to introduce AR

To maximize the benefits of AR civil engineering, it is important to create an implementation plan and internal structure suited to the scale of the site. Especially when rural SMEs adopt AR, paying attention to the following points will help ensure smooth uptake.

• Clarify objectives and issues: First, be clear about what you want to improve at your sites and what effects you expect from AR. Whether it is shortening consensus-building time, streamlining surveying, or training young staff, the tools and operational methods you choose will vary with your objectives. List site-specific issues and identify those that AR can realistically address as a first step.

• Start small and verify effects: Rather than introducing it across all sites at once, it’s recommended to start with small sites or internal demos. For example, pilot on a single model site and measure quantitative results like improved construction accuracy or shortened schedules. Sharing those effects internally helps build understanding among other employees and facilitates expansion to further sites. Initial successes fuel internal motivation for DX.

• Choose easy-to-use tools: SMEs may not be able to afford high-cost cutting-edge devices, but recently AR solutions that work on smartphones and tablets have increased. Choose tools that match your IT skills and budget. While advanced systems using dedicated AR glasses exist, starting with apps that run on commercially available mobile devices lets you test effectiveness at lower cost. Taking advantage of free trials or demo services is also useful.

• Train employees and build proficiency: When introducing new technology, careful explanations and training for site staff are essential. Veterans who are initially reluctant often become positive once they try the tools and feel their convenience. Prepare operation manuals and hold training sessions, and consider assigning an internal IT contact who staff can ask immediately when they encounter problems on site. Fortunately, many modern AR apps have intuitive UIs, so even those unfamiliar with smartphones often adapt through use. Position the tools as “useful tools for site work” and continually improve them by feeding back site opinions.

• Management understanding and support: Even if initiatives start at the field level, management support is crucial for sustained DX. Report cost-effectiveness and contributions to safety and quality from AR adoption, sharing benefits with management. Actively gather information on government and municipal subsidies or support programs to reduce cost burdens. Establishing a company-wide consensus that “we will use digital tools to improve productivity” makes it easier to advance DX initiatives beyond AR.

By following these points, even SMEs without dedicated IT personnel can introduce AR civil engineering without undue difficulty. Fortunately, Japanese-language AR apps and services for construction have appeared, and beginning with vendor support is possible. Start “where it’s inexpensive and easy to try”, listen to site staff, and iterate—AR will surely become a strong ally on the site.

Introduction to simple surveying with LRTK

One key technology for applying AR civil engineering on site is high-precision positioning. Since digital information is overlaid on real space, low positional alignment accuracy on site causes AR displays to shift and halves the intended effect. This is where combining RTK (real-time kinematic) positioning with AR comes in. RTK uses GNSS (satellite positioning like GPS) to determine positions with centimeter-level accuracy (half-inch accuracy), and embedding this into AR apps dramatically simplifies coordinate alignment on site.

Our company’s LRTK is a solution that makes this RTK positioning easy with just a smartphone. Using a dedicated compact receiver and an iPhone app, you can obtain high-precision site reference coordinates with only a few minutes of setup. Tasks that previously required total stations or expensive GNSS equipment can be completed by one person, and the acquired points are tagged with latitude, longitude, and elevation, allowing direct use in AR displays or import into CAD drawings. With LRTK, anyone can perform simple surveying, completing everything from staking out coordinates to as-built verification with just an iPhone.

LRTK’s strength is that it reduces the errors that were about 5-10 m (16.4-32.8 ft) with conventional GPS to about 1-2 cm (0.4-0.8 in) horizontally and about 3 cm (1.2 in) vertically. For example, coordinate staking based on drawing coordinates can be quickly and accurately marked by guiding users with LRTK app navigation. This enables non-survey personnel to perform position setting and verification even at sites lacking surveying specialists. Acquired data can be shared immediately with the office via cloud integration, allowing remote checks of site status or multiple people to view the same 3D point cloud data.

In short, LRTK is a new surveying tool for the AR era. Combined with a smartphone, it eliminates the burden of carrying heavy equipment and fits in a pocket while enabling civil surveying and AR display—an attractive feature. It is easy to introduce at rural sites and designed to work well even in mountainous positioning environments; it has been used for emergency surveying at disaster sites and infrastructure inspections. Companies that hesitate to adopt specialized equipment for AR civil engineering should consider starting with simple surveying using LRTK. Once high-precision position information is obtained, displaying models and drawings in an AR app is straightforward, making on-site AR use immediately practical. LRTK can be a reliable partner bringing DX benefits to rural construction sites and will surely be useful at your sites as well.

FAQ

• Q: Do I need expensive equipment or specialized knowledge to introduce AR? A: No, expensive equipment is not always necessary. Recently, many easy-to-use AR apps that run on smartphones and tablets have appeared. For example, there are solutions that allow overlaying drawings and surveying using only an iPhone or iPad without dedicated AR glasses. Many are intuitive to operate, and if users can perform basic smartphone operations, they can usually use these apps. With training for site staff and support systems in place, even those unfamiliar with IT can use them without issues.

• Q: Can AR be used without 3D design data or BIM models? A: Yes, it can. While advanced AR use is more effective with 3D models like BIM/CIM, AR does not always require 3D data. For example, you can attach 2D drawings or perspective images to space and display them, or use simple block models (rods or boxes) for layout checks. There are also lightweight AR functions that overlay notes on site photos. Start by trying AR with existing drawings and standard design information, and gradually step up to 3D use.

• Q: Is there merit in introducing AR to small or rural sites? A: Absolutely. In fact, the benefits of AR often appear more directly on small sites where each person’s role is large. For example, on a small crew where one person handles surveying, construction management, and photo documentation, an AR app can enable them to do all these at once. For projects with little time for consensus building, AR can streamline resident explanations and shorten schedules. Since neighbors are often close in rural projects, open information sharing via AR also helps build trust. Regardless of scale, introducing AR starting from areas that directly solve site issues yields steady benefits.

• Q: Will using AR really improve surveying and construction accuracy on site? A: Yes—when combined with high-precision positioning technologies, accuracy improvements are achievable. Standalone GPS-based simple surveying used to have errors of several meters, but technologies like RTK can reduce errors to a few centimeters. With AR overlays, you can check and construct with minimal discrepancy between drawings and the field. There are cases of successful AR overlays with accuracies around 5-10 mm (0.20-0.39 in), enabling sites to be finished “almost exactly as designed.” It depends on how you use it, but with appropriate technologies, AR can deliver accuracy suitable for practical work. Tools like LRTK allow accurate on-site model placement without manual coordinate adjustments, reducing the effort to compare with survey drawings and easing precision control.

• Q: What should we start with when introducing AR on site? A: As a first step, we recommend trying a familiar AR experience. For example, install a free or trial construction AR app on a smartphone and overlay your company’s drawing data or try simple point surveying. Even small-scale AR displays reveal insights and issues that paper drawings do not. Identify situations on site where “AR could help,” and run demos tied to actual tasks. As internal supporters and interested staff increase, move to concrete tool selection and training plans for full-scale introduction. Having a vendor demonstrate the solution can also be effective. Start by trying, accumulate small successes, and that spirit is key to successful AR adoption.