Is AR Inspection Really Usable? Examining the Advantages and Disadvantages of On-Site Implementation

Table of contents

• What is AR inspection?

• Benefits of AR inspection

• Drawbacks of AR inspection

• Points to consider when implementing AR inspection on site

• Closing: Easily introducing AR inspection with LRTK simple surveying

• FAQ

What is AR inspection?

AR inspection refers to an on-site inspection and checking method that leverages AR (Augmented Reality) technology. Using a smartphone or tablet camera feed, or through dedicated AR glasses, digital information such as design drawings, 3D models, and checklists is overlaid on the real-world view so inspectors can compare the physical object with the data. For example, on construction sites you can overlay design lines and dimensions in AR on completed structures to check the finish, and in manufacturing you can highlight the presence or mounting position of parts in AR to perform quality checks on assembled products. Traditionally, inspection work required cross-referencing drawings and measuring instruments, but AR enables intuitive, in-place comparisons and inspections.

Recently, AR-based inspection methods have begun attracting attention across industries. In particular, in construction and civil engineering, driven by initiatives such as the Ministry of Land, Infrastructure, Transport and Tourism’s "i-Construction," AR technology is being introduced to improve productivity and reduce labor on sites. Wider availability of AR-capable smart devices, higher-precision positioning, and easier preparation of 3D data have created an environment where AR inspection, once experimental, can now be used as a practical work tool. To the question "Is AR inspection actually usable?" we can say that we have now reached a stage where, "when used appropriately, it can deliver significant effects."

Benefits of AR inspection

Introducing AR inspection on-site can provide many benefits. The main advantages are organized below.

• Improved inspection accuracy: By overlaying digital design data on the real object, even slight misalignments or mistakes become harder to miss. Height differences or slope errors of a few millimeters (millimeter-level, approximately 0.04 in per mm) that are difficult to notice with the naked eye can be visualized in AR, for example by color-coding, making them obvious at a glance. Portions that will be hidden after completion, such as buried pipes or interior of walls, can be confirmed by displaying previously captured 3D scan data in AR. This allows detection of defects that even experienced personnel might overlook, dramatically raising inspection accuracy.

• Increased work efficiency and labor reduction: Incorporating AR inspection can greatly streamline measuring and cross-checking tasks that previously required time and manpower. By performing three-dimensional measurement over wide areas and automatically judging pass/fail, the effort of measuring many individual points can be reduced. For example, using point cloud data acquired by drones or smartphone LiDAR can shorten what used to take a full day for topographic surveying and as-built inspection to a short time. Since software analyzes results instantaneously, the person in charge only needs to confirm OK/NG on the screen. Being able to "inspect on-site and correct on-site" reduces the risk of later discovery of problems and rework. One inspector can cover a wide area, enabling quality control even on sites short of personnel and contributing to labor savings.

• Improved safety: AR is effective for inspections that involve hazards. When taking measurements at height or on steep slopes, if guidance can be provided by placing AR markers from a distance, the frequency with which workers enter dangerous areas can be reduced. AR can also display virtual exclusion lines around areas with operating heavy machinery and be used for safety verification. If veteran technicians at remote locations share the site's AR feed while giving instructions, precise guidance and inspection can be carried out without them being onsite, contributing not only to safety but also to operational efficiency.

• Supports skills transfer and workforce development: AR inspection makes it easier to judge intuitively without relying on the intuition and experience of skilled workers, helping younger or less experienced staff maintain quality. AR visually indicates "where and by what standard to measure" and whether the finish is within tolerance, so inexperienced workers don’t get lost. This helps with skill transfer and keeps a consistent inspection level even when veteran staff are lacking. Clear AR feedback deepens workers’ understanding and functions as an educational tool.

• Digitalization of records and reports: Data obtained during AR inspections can be stored directly as electronic records. Screenshots of inspection results and point cloud data can serve as evidence in reports and acceptance documentation. As-built drawings and photo logs that used to be produced manually can be replaced by automatically plotted drawings of measurement results and AR-screen photos, reducing the burden of paperwork. When linked with cloud services, data recorded on-site can be shared and saved immediately, smoothing management of inspection histories and explanations to clients.

• Smoother communication and consensus building: Information visualized in AR can be intuitively shared with stakeholders inside and outside the site. For example, showing inspection results on a tablet to a client or supervisor on the spot helps establish a shared understanding of pass/fail decisions and corrective points. Issues that were hard to convey with drawings or numbers alone become clear at a glance with AR, shortening time for explanations and discussions. This helps speed consensus with clients and reduces disputes over rework after inspection.

• Lowering introduction costs: Although AR inspection may sound high-tech, it has become easier to start without expensive specialized equipment. Simple AR measurement can be done with a commercial smartphone or tablet and a dedicated app. Previously, millimeter-level measurements required costly total stations or surveying instruments, but now low-cost alternatives such as small GNSS receivers that attach to smartphones are available. With lower initial investment, AR inspection is becoming an accessible option for small- and medium-sized businesses. Time savings and reduced personnel costs also produce significant cost benefits, and viewed overall, you can expect returns that exceed the investment.

Drawbacks of AR inspection

On the other hand, there are disadvantages and challenges to keep in mind when introducing and operating AR inspection. It’s important to consider the following points beforehand instead of being dazzled by the benefits alone.

• Upfront costs and equipment procurement burden: Although it’s easy to start with a smartphone or tablet, full-scale operation may require purchasing high-performance devices and additional peripherals. For wide-area, high-precision alignment you may need an RTK-GNSS receiver, and for extended effective distance, dedicated AR glasses can be useful. Introducing these devices and compatible apps involves certain costs, so budget considerations are unavoidable.

• Preparation and operational overhead: To make AR inspection work, you need to prepare digital data and the environment in advance. You must provide the design 3D models or drawing data to overlay in AR, and in some cases you need to place markers or perform coordinate alignment (calibration). AR-specific setup such as converting to the appropriate coordinate system and setting reference points for each site is indispensable. During operation, device and software management is also required—apps and firmware updates, cloud service contracts and maintenance introduce new IT management tasks.

• Technical constraints: AR is subject to environmental conditions and device performance. For example, using a tablet outdoors can be hard to see in direct sunlight, and there is a risk in handling precision equipment in rainy or dusty environments. Positioning depends on GPS and communications, which may be weak or inaccurate in mountainous areas or inside buildings. Battery drain can be significant, so portable batteries are essential for long continuous use. Extended use of AR glasses has also been reported to cause eye strain and headaches, so worker physical burden must be considered. Because of these technical constraints, there will be situations where AR inspection is unsuitable and cases where traditional methods must be used in parallel.

• Concerns about accuracy and reliability: On sites unfamiliar with digital technology, people may worry, "Is it really measuring correctly?" Indeed, AR measurement results and pass/fail decisions can feel like a black box, and newcomers may have doubts. Errors due to sensor drift or recognition failures are not impossible, so for critical inspection items, it may be prudent to double-check with traditional measurement methods at first. System failures or device malfunctions can halt inspections entirely, so having a backup system—such as paper drawings or manual procedures—is reassuring.

• Learning curve and on-site adoption challenges: Fully utilizing AR inspection on-site requires raising user literacy. After introduction, employees may be confused about device operation and workflow. Veteran workers in particular may be resistant to new technology because they are used to traditional methods. A certain training period is required before everyone can use it smoothly, and establishing operation rules and manuals takes effort. If the system is not actually used on site, it will become a wasted asset, so gradual familiarization and measures to promote adoption are necessary.

Points to consider when implementing AR inspection on site

Based on the benefits and drawbacks, the following points summarize what to pay attention to when actually introducing AR inspection on site. To make the most of this new technology, proceed with preparation while keeping the following in mind.

• Clarify the purpose and target tasks for introduction: First, define clearly why you are introducing AR inspection. Is it to improve quality, reduce labor, or enhance client services? Decide the scope of inspection tasks to which it will be applied. A clear purpose makes it easier to set evaluation criteria after introduction.

• Prepare necessary data and the work environment: Prepare the design data or 3D models to be overlaid in AR. If only drawings are available, you can scan the constructed object beforehand to obtain point cloud data as a substitute. Also verify the operating environment such as GPS and internet connectivity. If the site lacks high-precision reference points, prepare GNSS equipment; if communications are unstable, provide a pocket Wi-Fi, and so on.

• Choose appropriate devices and apps: Select AR tools suited to the use case and site environment. For indoor-focused work, use tablets with marker-based AR apps; for wide outdoor areas, choose smartphone apps that integrate with GNSS. Dedicated AR glasses free up both hands but are expensive, so starting with handheld smartphones or tablets is also an option. Compare several products and services, and choose one that fits the site by considering usability and support.

• Pilot at small scale and acclimate the site: Rather than rolling out across all sites and processes at once, begin with pilot projects or limited zones. Have site staff actually use the system and provide feedback on effects and issues. For example, try AR only for as-built inspection on one construction site as a small start. As the site adapts, gradually expand the scope to reduce resistance and promote smooth adoption.

• Establish training and rules to stabilize operation: After introduction, continue educating and training site staff. Provide initial training on operation and troubleshooting, and prepare manuals. Define reporting workflows for AR-derived inspection results and rules for combined use with traditional methods (for example, measuring critical dimensions with conventional methods as well). Hold regular meetings to review operations and share successful cases internally. Improve procedures and settings based on site feedback to make AR inspection part of daily work.

Closing: Easily introducing AR inspection with LRTK simple surveying

As described above, AR inspection has the potential to simultaneously improve on-site productivity and quality. Although it is new technology, it offers practical benefits beyond mere novelty, and it is expected to become increasingly widespread as a "usable" technology. In construction, where aging and labor shortages are serious, AR inspection can become a trump card that helps achieve both efficiency and quality assurance.

To realize its full potential, tools must be easy for anyone to use. Recently, all-in-one surveying systems that combine high-precision GNSS receivers, smartphone apps, and cloud services have appeared. For example, LRTK, developed by a venture originating from the Tokyo Institute of Technology, consists of a pocket-sized RTK-GNSS antenna attachable to a smartphone and a dedicated app, and its key feature is the ease of use that allows surveying and inspection to be completed with just a smartphone. Even technicians without special training can operate it intuitively, and it includes simple surveying functions that handle centimeter-class high-precision positioning (centimeter-level, half-inch accuracy), point cloud scanning, and AR-based as-built checks. Using such solutions makes inspection tasks that previously relied on specialists more accessible, greatly lowering the hurdle for on-site AR adoption.

The LRTK series supports i-Construction promoted by the Ministry of Land, Infrastructure, Transport and Tourism and is a platform that comprehensively supports site DX, including cloud-based data sharing and remote assistance. Detailed functions and case studies are available on the LRTK official site, so please refer to them. Is AR inspection really usable? — The answer is: "If you choose the right tools, it can be handled well on site." Why not take this opportunity to introduce the latest AR technology on your site?

FAQ

Q. What equipment is needed to perform AR inspection? A. Basically, you can start with an AR-capable smartphone or tablet and a compatible app. For small-scale inspections, commercial mobile devices alone may suffice, but to improve accuracy, combining high-performance tablets or RTK-GNSS receivers is recommended. In some cases, markers or QR codes are affixed on site for alignment. AR glasses that free both hands can improve efficiency for certain tasks, but it’s advisable to try with handheld devices first.

Q. How accurate can AR inspection be? A. Accuracy varies with the equipment and methods used, but under favorable conditions inspections can be performed with errors below a few centimeters. For example, smartphone camera AR features alone can produce deviations of several cm to 10 cm (several in to 3.9 in), but combining RTK-GNSS or high-precision reference points can align virtual models with positional accuracy of less than 3 cm (less than 1.2 in). Using point clouds acquired with a device’s LiDAR scanner can enable millimeter-level evaluation of surface height differences (millimeter-level, approximately 0.04 in per mm). However, because accuracy depends on environmental conditions and calibration quality, set tolerances with margin for critical dimensions and, when necessary, corroborate with traditional measurements.

Q. How much does it cost to introduce AR inspection? A. Costs vary greatly depending on the chosen system and equipment configuration. Combining commercial tablets with free apps can start from tens of thousands of yen, and even full-scale operation is often less expensive than equipping a complete set of traditional surveying instruments. Small GNSS receivers that attach to smartphones are offered at more accessible price points compared to conventional high-precision surveying gear. Considering labor savings and reduced rework, initial investments can typically be recovered. Start small to verify cost-effectiveness and scale up gradually.

Q. Can people who are not good with IT use it? Are special skills required? A. While some confusion is natural at introduction, basic operation is not particularly difficult. Many AR inspection systems include on-app guidance and tutorials that let users complete tasks by following prompts. All-in-one systems like LRTK allow you to record coordinates by pointing an antenna-equipped phone at a point and pressing a button, and to overlay models by simply selecting them. Some practice is needed, but users get comfortable after a few on-site uses. Simple training or demos at rollout help even IT-averse personnel start with confidence.

Q. Can small sites and small-to-medium enterprises make use of AR inspection? A. Yes. AR inspection is particularly beneficial where small teams manage sites. Tools that rely mainly on smartphones allow site introduction without large capital investment. SMEs can also use affordable subscriptions or rental equipment to try AR inspection only for the required period. Even when hand surveying cannot cover wide areas, combining drones or 360° cameras with AR enables efficient inspection, and there are cases where small teams achieve significant results. The important thing is to choose tools that fit your company size and to accumulate know-how step by step. Start within a manageable scope and experience the benefits of AR inspection.