Make New Hires Immediately Effective: AR As-Built Inspections Support New Employee Training

Table of Contents

• What is AR as-built inspection

• Challenges of traditional as-built inspections and new employee training

• Why AR as-built inspection makes new hires immediately effective

• AR as-built inspection enabled by simple surveying with LRTK

• FAQ

What is AR as-built inspection

An as-built inspection is a quality-control process in civil engineering and construction that verifies whether completed structures and terrain conform to the shapes and dimensions shown on the design drawings. Traditionally, heights, thicknesses, and other measurements were taken point by point using surveying instruments or tape measures, and those measurements were compared with the design values on drawings to determine pass/fail. However, this method required experience and intuition for both measurement and evaluation, making it a high hurdle for new hires. Organizing measurement results and preparing reports also took time, placing a heavy burden on field personnel.

In this context, AR as-built inspection has attracted attention. By using AR (augmented reality) technology to overlay 3D design models and measurement data on live site images displayed on a smartphone or tablet screen, this method allows direct on-site verification of as-built conditions. Compared to the traditional method of checking on paper drawings or numerical data, overlaying digital information onto the real world enables even inexperienced new hires to intuitively judge workmanship quality. For example, in road construction, displaying the planned BIM/CIM model in AR over live site footage and comparing it with the current terrain makes subtle height differences—millimeter-level deviations (fractions of an inch)—immediately apparent.

To achieve AR as-built inspection, it is necessary to accurately align the smartphone or tablet camera image with the design data. For that purpose, device positions are corrected to centimeter-level (half-inch-level) using high-precision GNSS (satellite positioning). Recently, small RTK-GNSS receivers that attach to smartphones have become commercially available, making real-time high-precision alignment possible with a smartphone + RTK combination. Also, using the LiDAR sensor built into the latest *iPhone* and *iPad Pro*, site geometry can be captured quickly as point cloud data (a collection of many 3D coordinate points). Advanced applications include displaying the differences between that point cloud data and the design model in AR on-site and visualizing excesses and deficits with color-coded heat maps. The Ministry of Land, Infrastructure, Transport and Tourism is also promoting 3D measurement and AR use as part of i-Construction, and AR as-built inspection is increasingly expected to improve both site efficiency and quality.

Challenges of traditional as-built inspections and new employee training

To understand the advantages of AR as-built inspection, first let’s organize the challenges of traditional as-built inspections and the difficulties of training new employees. Traditional methods had the following problems:

• Time- and labor-intensive work: Measuring points one by one manually and comparing them with drawings is extremely laborious. On large projects, surveying teams may take several days to prepare inspections, and efficiency does not easily improve even when new hires join. Because measurements take time, discovery of problem areas tended to be delayed.

• Dependence on experienced personnel: Accurate measurement and judgment of as-built conditions require advanced expertise and experience. It was difficult to entrust inspections solely to new hires, and veteran oversight or double-checking was always necessary. Sites faced chronic labor shortages and an aging workforce, causing increased burdens on experienced staff and stagnation in training new employees.

• Risk of human error: Manual records can contain note-taking mistakes or data transcription errors. New hires are particularly likely to miss measurement points or make recording mistakes, and if deficiencies are found after inspection, re-measurement and rework may be required. Because errors cannot be grasped in real time, corrective actions on the spot are difficult.

• Burden of documentation and handover: Compiling charts and reports summarizing inspection results is also cumbersome. New hires lack know-how for report writing and require senior staff to teach them closely. In addition, organizing a photographic ledger of site photos and creating comparison materials between as-built drawings and measured values take time, reducing the crucial amount of on-site coaching.

As described above, traditional as-built inspections require a long period of experience before someone becomes fully competent, so it takes time for new hires to become effective. As a result, young staff do not develop, and the site’s overall productivity does not improve, creating a vicious cycle.

Why AR as-built inspection makes new hires immediately effective

Why does the introduction of AR as-built inspection enable new hires to perform as effective workers right away? The main reasons are as follows.

• Improved understanding through intuitive 3D visualization: AR overlays the design shape and reference lines on the real object, so even new hires who cannot fully read drawings can visually understand the as-built condition. Millimeter-level deviations (fractions of an inch) that are hard to grasp from numbers or tables are expressed on the screen as differences in color or model mismatches, so one can intuitively tell “correct/offset.” This allows even inexperienced personnel to quickly grasp quality checkpoints.

• Real-time feedback enables immediate correction: With smartphone- or tablet-based AR as-built inspection, measurement results can be analyzed and pass/fail judgments made on the spot in some cases. For example, if an area exceeds the allowable tolerance, it can be immediately color-coded on the screen, allowing new hires to discover and correct problems on site. Deficiencies that used to be found only after bringing measurement data back can now be seen in real time, increasing situations where a new hire can address issues before consulting a senior. Because work can proceed while making on-the-spot adjustments, new hires’ learning curves accelerate dramatically.

• Guided procedures reduce mistakes: AR as-built inspection apps often provide on-screen guidance for procedures, so even inexperienced new hires can complete measurements by following the instructions. For example, prompts like “stand at this location and start scanning” or “next, capture this area” allow inspections to be performed in the correct sequence without a veteran standing next to them. As a result, omissions and recording mistakes decrease, and more tasks can be entrusted to a single new hire with confidence.

• Automated data processing and reporting: Many AR as-built inspection solutions integrate with the cloud or include in-app analysis to automatically generate reports from measurement data and display pass/fail results on the screen. This reduces the burden on new hires who struggle with complex calculations or form creation, enabling anyone to produce a consistent quality deliverable in a short time. With numbers and photos automatically organized according to report templates, seniors spend less time checking and correcting details, reducing the burden on training staff.

• Digital sharing of tacit knowledge: AR as-built inspection also makes it possible to visualize and share experienced practitioners’ know-how with new hires. Intuitive judgments traditionally known only to veterans—such as “measure this area carefully” or “this degree of deviation is acceptable”—can be shown explicitly as reference values and tolerances within the AR system. New hires can learn quality standards naturally by working with AR-displayed criteria on site. In addition, measurement data can be shared in real time with seniors and supervisors via the cloud, allowing those offsite to check the new hire’s work and provide advice. As a result, on-the-job training (OJT) becomes more efficient and knowledge transfer smoother.

For these reasons, introducing AR as-built inspection enables new employees to handle site inspection tasks in a short period, helping alleviate labor shortages and improve productivity. For younger generations familiar with digital tools, smartphone- and tablet-based inspection methods are highly compatible and can boost motivation. Having new hires actively involved in on-site DX (digital transformation) is also expected to accelerate organizational change.

AR as-built inspection enabled by simple surveying with LRTK

Smartphone × AR as-built inspection is already entering practical use on sites. A representative example is LRTK, a solution provided by Lefixea. LRTK consists of a compact high-precision GNSS receiver that attaches to a smartphone, a dedicated app, and cloud services, and is designed to allow anyone on site to perform simple surveying. By attaching a receiver weighing several hundred grams to a smartphone and launching the app, centimeter-level (half-inch-level) positioning is possible in real time without complicated initial setup. The LRTK app supports point cloud scanning and AR overlay with design models, and also integrates functions such as guidance to stake-out positions and photo-attached surveying logs—tasks that previously required specialized equipment and skilled personnel—into an all-in-one solution. It truly paves the way for an era in which surveying through as-built inspection can be completed with a single smartphone. Because it makes use of existing smartphones, the initial cost barrier is low and it can be introduced on sites without special qualifications or permits, which is another attractive feature.

In practice, municipal employees and construction site teams have begun smartphone surveying using LRTK, achieving results in disaster recovery site surveys and as-built management of infrastructure works. There are reports that surveying and inspection work that used to take two to three people several days has been completed by one person within a few hours using LRTK. The efficiency gains from smartphone × AR, which are easy for new hires to handle, can be a great help to the construction industry suffering from chronic labor shortages. Furthermore, as site digitalization progresses and data accumulates, new developments such as AI-driven optimization of construction management can be expected. AR as-built inspection using smartphones is becoming the new norm for site management. As devices and analysis technologies evolve, the accuracy and efficiency of as-built management will continue to improve. As a first step, it is well worth trying cutting-edge tools like LRTK. For more details, please also refer to the [LRTK official site](https://lefixea.com).

FAQ

Q. What is AR as-built inspection? A. It is an inspection method that directly compares the as-built condition on site with the completed form shown in the design drawing using AR technology. Design data and reference lines are overlaid on the smartphone or tablet screen so you can check on site whether a structure has been built according to the drawings. Unlike traditional methods that measure values with tape measures or levels and later compare them with drawings, AR as-built inspection allows comparison of digital design information with the real space. This makes it easy to spot deviations intuitively and enables rapid inspection and correction.

Q. Can inexperienced new hires use it? A. Yes, they can become proficient after a relatively short familiarization period. Smartphone apps for AR as-built inspection are designed with intuitive operation in mind, and by following on-screen prompts and moving the smartphone as instructed, measurements and AR displays can be performed. For example, with LRTK, following the guidance to execute scans enables point cloud measurement and model comparison. Even first-time users can start using it after a short training session. Although basic surveying knowledge is desirable to improve accuracy, smartphone × AR surveying has fewer configuration items than traditional surveying instruments, making it easy for anyone to perform measurements. With an environment where field staff can autonomously conduct inspections, new hires can be entrusted with tasks with confidence.

Q. Is the accuracy of smartphone-based measurement sufficient? A. With appropriate equipment configuration and procedures, accuracy that meets public standards can be achieved. The iPhone’s LiDAR scanner allows high-precision 3D measurement at short range, and combining it with an RTK-GNSS receiver can achieve positioning that confines horizontal errors to a few centimeters (a few inches) and vertical errors to around 5 cm (2.0 in). Under favorable conditions, as-built measurements can achieve accuracy comparable to traditional total station surveying. There are case reports in which smartphone-based as-built measurement methods meet the accuracy requirements of the Ministry of Land, Infrastructure, Transport and Tourism’s as-built management guidelines (draft), and with proper verification they can be applied to inspection tasks. However, achieving high accuracy requires attention to device calibration and alignment with control points, so it is advisable to start with small-scale verification when introducing the technology.

Q. What concrete benefits are there compared to traditional methods? A. Smartphone × AR as-built inspection offers several advantages not found in traditional methods. First, work speed improves dramatically: measurement through analysis can be completed almost in real time on site, allowing rapid determination of inspection results and progress calculation. Second, it reduces personnel and cost: one person can perform measurements with a smartphone without arranging a specialized surveying team or expensive equipment, lowering staffing and equipment procurement costs. Safety also improves because there is less need to take detailed measurement points on dangerous slopes or at height; measurements can be taken non-contact from a safe distance, reducing worker risk. Moreover, there are significant benefits for quality control and communication: objective evaluation of as-built conditions based on data, and visual sharing of results via AR, reduces misunderstandings with clients and supervisors and smooths corrective instructions. Relying less on paper records and verbal explanations helps prevent rework and speeds consensus building.

Q. What is needed to start AR as-built inspection? A. Basically, a compatible smartphone and a dedicated AR surveying app are enough to get started. LiDAR-equipped devices like the latest iPhone or iPad are best, but even devices without LiDAR can capture 3D point clouds using photogrammetry-capable apps. In addition, high-precision positioning information is important to overlay measurement data on design coordinates, so using an RTK-GNSS receiver (high-precision GPS unit) in combination is desirable. This allows point clouds and models to be given accurate world coordinates, reducing alignment work. Once prepared, you can point a smartphone to perform measurements and immediately check and record results in AR. For example, introducing LRTK allows measurement to start simply by attaching a small GNSS to a smartphone and launching the app, creating an environment where field staff without surveying expertise can use it immediately.

Q. I’m worried about getting internal buy-in for introducing new technology. A. When explaining the benefits of AR as-built inspection, emphasize advantages in both quality improvement and schedule shortening. Concrete benefits such as “preventing construction errors that were previously missed” and “reducing inspection preparation and rework, making it easier to meet deadlines” are persuasive. Demonstrating AR use on site is especially effective: seeing a completed model appear on a smartphone screen is intuitive and helps supervisors and clients understand and accept it. Also, because it is a cutting-edge technology recommended by the national i-Construction initiative, introducing it can signal that the company is undertaking forward-looking efforts. Explain that it is an investment that improves site safety and fosters the development of young talent, and obtain internal understanding and cooperation by conducting small pilot introductions and sharing the results.