How Point Cloud Scanning Will Change Construction! The 3D Construction Revolution Brought by LRTK

Introduction: Why “3D Construction” Now?

In recent years, the construction industry has been accelerating its shift from traditional 2D drawings and manual surveying-based construction management to 3D construction. There is a growing movement to capture entire sites as three-dimensional data and use that for design and inspection. Behind this trend are tailwinds such as the Ministry of Land, Infrastructure, Transport and Tourism–promoted i-Construction and other construction DX initiatives, and the need to improve productivity in response to severe labor shortages (the so-called “2024 problem”). Another major factor is recent technological advances that have made 3D scanning (point cloud measurement)—which previously could only be handled by specialized surveyors—easy enough for anyone to use.

This article explains, in simple terms, what point cloud scanning is, its principles, and its benefits—the key to 3D construction. Using the latest tool LRTK, which enables anyone to perform high-precision point cloud measurement with a smartphone, we will examine concretely how job sites will change. Let’s explore together how traditional construction management is being updated and how an era when anyone can utilize precise 3D data is rapidly approaching.

What Is Point Cloud Scanning? (Principles and Benefits)

Point cloud scanning is a measurement method that records objects in three-dimensional space as countless measurement points and represents shapes as a collection of those points (point cloud data). Each point includes XYZ coordinate values indicating position (and color information if photos are used), and the denser the points, the more photo-like and precise the reproduction of the real object. For example, by converting terrain or structures into point clouds, you obtain digital data that captures the site as if it were a 3D photograph, very close to reality. Acquired point cloud data can be viewed from any viewpoint on a computer and used for dimensional measurement or comparison analysis with design data. It is truly a technology for creating a digital twin (a twin model of the real-world space) of the site.

There are various methods to acquire point cloud data. Typical ones include high-density measurements with stationary 3D laser scanners, aerial photogrammetry using drones, and easy scans using the latest smartphone-integrated LiDAR. Each has pros and cons, but a common advantage is that they can measure wide areas with high accuracy in a short time. Unlike traditional ground surveying that measures point by point, tasks that used to take a person half a day—for example, terrain surveying—can be converted into a point cloud of the entire site in tens of minutes using a drone, according to reports. Furthermore, by utilizing laser light or aerial photography, current conditions can be safely captured even in hazardous areas where people cannot enter. In this way, point cloud scanning is expected to greatly improve efficiency and sophistication across surveying, construction management, and maintenance.

In practice, point cloud data is increasingly used for as-built management (post-construction shape inspection) and construction records. Where inspections traditionally measured only parts of a completed structure, point clouds enable millimeter-level checks of the entire structure. Slight elevation differences and surface irregularities become obvious in 3D, drastically improving quality assurance accuracy. Also, point clouds can be stored as detailed digital records of the as-built shape, allowing accurate current-condition drawings to be produced later even if original drawings are missing. The Ministry of Land, Infrastructure, Transport and Tourism also recommends using point clouds for as-built management, making them valuable data for future maintenance records.

Point Cloud Scanning Anyone Can Do with LRTK

LRTK is a cutting-edge positioning and point cloud measurement tool composed of a small RTK-GNSS receiver that can be attached to a smartphone and a dedicated app. When attached to a smartphone, it enables the phone to obtain centimeter-level (half-inch accuracy) high-precision positioning information via real-time satellite positioning. If you simultaneously scan the surroundings with the smartphone camera or LiDAR sensor, anyone can immediately acquire 3D point cloud data with absolute coordinates on the spot. It is truly a revolutionary solution that turns a smartphone into a high-precision 3D scanner.

The usage is also extremely simple. For example, attach the LRTK receiver to a smartphone, launch the dedicated app, and start positioning. After receiving satellite correction information in a few tens of seconds and enabling high-precision positioning, walk around the site with the smartphone in hand while scanning with the camera/LiDAR. Because the point cloud is displayed in real time on the smartphone screen, you can proceed while confirming there are no omissions. The acquired point cloud is automatically assigned high-precision position coordinates, so the data can be used immediately after scanning. Without special equipment or advanced surveying skills, anyone can conduct precise 3D measurements with these simple steps—that is LRTK’s strength.

With the advent of LRTK, the barrier to 3D scanning has dropped dramatically. Compared to traditional laser scanners and drone measurement, it mainly offers the following advantages:

• Ease of use and versatility: Unlike heavy stationary scanners, a smartphone + LRTK is portable and easy to prepare. You can flexibly scan in narrow indoor spaces, tunnels, underground pits, and even during night work—regardless of location or time. Unlike drones, there is no need for flight permission applications or constraints from weather, so you can start measuring whenever you wish. From newcomers to veterans, it can be operated intuitively by one person, making it accessible to anyone on site.

• Low cost: Introducing high-performance 3D laser scanners or surveying drones required large investments, but smartphone + LRTK can be started at a relatively low cost. Because you can use existing smartphones, initial investment can be significantly reduced, making it easier for small and medium-sized construction companies to adopt the latest point cloud technology. By using rental or subscription services, you can operate for only the period you need, allowing organizations of any scale to enjoy the benefits.

• High precision anywhere: LRTK supports Japan’s high-precision satellite positioning service “Michibiki” CLAS, allowing it to receive correction information directly from satellites and maintain centimeter-class accuracy (half-inch accuracy) even at sites where internet communication is unavailable, such as mountainous areas or offshore. It enables centimeter-class positioning (half-inch accuracy) regardless of location—truly “anyone, anywhere, anytime” precise 3D scanning. It is compatible with ICT construction and i-Construction promoted by the Ministry of Land, Infrastructure, Transport and Tourism, and is attracting attention as an innovation that accelerates DX in the construction industry.

Instantly Visualize Volume, Area, and Cross-Sections from Point Cloud Data

After acquiring point cloud data, another major advantage is that you can immediately visualize required quantities and shapes. With dedicated software or cloud tools, you can instantly measure any distance, area, or volume from the point cloud. For example, if you scan a pile of excavated soil with LRTK and calculate its volume on the spot, you can instantly determine the number of dump trucks required. Tasks that previously required surveying on site and returning to the office to calculate earthwork quantities—taking more than half a day—can now be completed with just minutes of scanning. Since daily progress (earthwork volume) can be grasped instantly, decisions about heavy equipment operation schedules and truck arrangements can be optimized, greatly speeding up construction management decision-making.

It is also easy to create cross-sectional drawings from point cloud data to check shapes. You can extract an arbitrary vertical section from the point cloud and measure heights and thicknesses on that section. For example, you can check cross-sections at multiple locations for roads or development sites to visually confirm whether the slopes match the design. Because software automates the formerly laborious drafting work, you can quickly verify on-site with a tablet in hand. LRTK’s cloud service also has functions to display point clouds in a browser and measure distance, area, and volume with one click, enabling basic quantity calculations and cross-section checks even without specialized software. Site personnel can measure and decide on the spot as needed, greatly contributing to operational efficiency.

Immediately Check As-Built Deviations by Comparing with Design

Acquired point cloud data can be overlaid and compared with 3D models or drawing data from design. This allows you to instantly confirm on site whether the finished shape and dimensions match the design. In conventional as-built management, it was common to measure a few points after completion and compare them with drawings, but with point clouds you can check the entire structure’s surface, eliminating oversights. Slight height excesses or deficits and positional deviations can be identified in 3D, and if deviations exceed tolerances you can decide on corrective actions immediately. For example, in a riverbank protection project, after concrete placement the as-built point cloud acquired by LRTK was overlaid with the design 3D model to comprehensively verify deviations in the finish. Inspections that previously checked only key points after completion can now show at a glance where and by how much things deviate on the point cloud data, eliminating gaps in quality control. Detecting errors early and correcting them prevents rework in later stages.

On the LRTK cloud, there is also a function to color-code differences between point clouds and design data as a heat map. Warm and cool colors intuitively indicate elevation differences, enabling even inexperienced staff to immediately recognize problem areas. You can check error amounts numerically for each part or overlay design lines and point clouds on cross-sections to visualize deviations. Inspection results can be output as report documents with charts and tables, streamlining the preparation of as-built reports. The acquired 3D as-built data can be saved directly as electronic delivery final documents, becoming valuable assets for future maintenance and construction records.

AR Overlays for On-Site Construction Support

With the high-precision positioning information that LRTK provides, on-site support using AR (augmented reality) is also possible. By overlaying design 3D models or lines from drawings onto the camera view of a smartphone or tablet, digital data can be projected onto the real scene. For example, displaying an AR model of the planned structure on the ground before construction allows stakeholders to intuitively share the final image that is hard to grasp from drawings alone. This smooths explanations to clients and communication among site staff, making it easy to align spatial understanding such as “this will be here.” Also, overlaying the design model on the actual scene during construction to check the final position enables immediate verification on site of placement and elevation. There is no need to rely on “intuition” from comparing drawings and reality, so anyone can accurately detect placement errors, reducing rework and improving quality.

LRTK’s AR has various applications. For example, in buried pipe work, if you scan the piping with LRTK before backfilling, you can later confirm the location and depth of the underground pipe just by pointing a smartphone at the ground via AR. This improves safety in nearby works around hazardous gas pipelines or cables since unseen buried utilities can be identified in advance. You can also display design control points or lines in AR and use them for layout marking. Processes where surveyors used to install batter boards can be replaced by simply marking points following on-screen guides, enabling even those with limited surveying experience to perform accurate layout marking. On site, tablets or AR glasses can display point cloud data overlaid with design models to check as-built conditions against the real scene and direct corrective actions. By fusing digital and real worlds through AR, the way construction management and communication work is changing significantly.

Changes at Job Sites: Efficiency, Quality, and Communication

The introduction of 3D point cloud scanning (LRTK) has brought the following major changes to on-site operations:

• Improved operational efficiency: Time and effort for surveying and inspection are greatly reduced. Since a single scan can record the entire site, tasks that previously took multiple days can often be completed in hours or even minutes. For example, the previously mentioned earthwork calculation that took half a day was shortened to a few minutes. A survey by the Ministry of Land, Infrastructure, Transport and Tourism reported that using ICT construction reduced earthwork task time by about 30% on average, clearly demonstrating the productivity gains of point cloud technology. Also, because measurements can be taken without physical contact, surveyors no longer need to enter high or hazardous locations, improving safety. Being able to measure with fewer people and in less time makes it feasible to operate sites even amid labor shortages.

• Advanced quality control: Since point clouds can comprehensively measure the site, inspection accuracy for construction quality improves dramatically. Millimeter-level irregularities and dimensional differences that humans might miss are detectable in 3D, ensuring nonconforming areas are properly corrected. By increasing inspection points in as-built checks, variations and omissions in quality are eliminated, boosting client trust. Storing inspection results as point cloud data also aids future repairs and verification, enabling long-term quality assurance. Reducing rework shortens schedules and compresses costs, achieving both quality and productivity.

• Smoother communication: 3D data is visually intuitive and dramatically improves information sharing among stakeholders. By sharing point clouds and models in the cloud, headquarters and clients can easily check site conditions remotely in 3D. Conditions that were hard to convey verbally or with 2D drawings become obvious with 3D models, shortening meeting and reporting times. Using AR to show models on site while explaining enables anyone, even non-experts, to understand intuitively, significantly reducing time to reach agreement. Sharing data across site and office, clients and contractors fosters a sense of unity and smooth communication throughout the project.

Conclusion: The Future of 3D Construction Opened by LRTK and Point Cloud Scanning

With the spread of point cloud scanning and ICT technologies, 3D construction is finally becoming a reality. As shown in this article, using accessible tools like LRTK allows anyone to digitalize an entire site and immediately apply that data to construction. This is not merely an evolution of measurement methods, but a transformation in how construction management itself is done. Practices that relied on experience and intuition are being replaced by objective, data-driven decision-making, enabling both efficiency and quality. Visualizing sites with 3D scans and AR dramatically enhances construction transparency and productivity, powering DX in the construction industry.

Going forward, the use of point cloud data and digital twins will increasingly become standard. High-precision 3D construction will become indispensable not only for large-scale projects but also for small- and medium-sized sites. Responding early to this trend can create significant advantages in operational efficiency and competitiveness. Fortunately, with solutions like LRTK, cutting-edge 3D surveying is accessible without large investments or specialized knowledge. Consider adopting this 3D construction revolution at your sites and stepping into next-generation construction management.

Bonus: Simple Surveying to Start with LRTK

Finally, a little bonus information. LRTK is not only useful for advanced 3D point cloud measurement but also greatly helps as an everyday simple surveying tool. With a single smartphone, you can perform tasks that previously required transit or level instruments—such as establishing control points, checking elevation differences, and measuring distances—right on site. For example, if you want to “know the coordinates of this point,” “mark a specified position on a drawing,” or “quickly measure the distance between two points,” LRTK allows site staff to solve these without waiting for a professional surveyor. Even beginners can obtain centimeter-accuracy coordinates (half-inch accuracy) by following the app’s prompts and tapping buttons, greatly lowering the barrier to surveying. If you suddenly need a survey, you can handle it with just a smartphone, speeding up site operations and enabling flexible responses.

Thus, LRTK is a reliable device that transforms your smartphone into a versatile surveying instrument. From high-precision GNSS point observations to detailed point cloud scans and AR-based construction support, it meets a wide range of needs with a single device. You can introduce it in steps—“start with simple surveying, then try point cloud scanning once comfortable”—so you can adopt the latest technologies without strain according to your company’s operations. Try LRTK to experience easy and smart surveying and construction management.