AR and Point Cloud Surveying with a Smartphone? The Latest Surveying Device LRTK Overturns Conventional Wisdom!

The conventional wisdom at surveying sites is undergoing a major shift. Until now, surveying equipment meant large instruments mounted on tripods or specialized devices handled by multiple people. However, in recent years, combining smartphones with compact devices has made it possible for anyone to perform high-precision surveying easily. AR (augmented reality) technology and 3D point cloud data are attracting attention, and the construction industry’s move toward digitalization has led to a stream of innovative tools. A prime example is the latest surveying device LRTK, which enables centimeter-precision positioning and point cloud scanning with a smartphone. This pocket-sized device realizes high-precision surveying and AR visualization, overturning traditional assumptions and drawing significant attention. Sites that have already introduced LRTK report dramatic productivity improvements and the establishment of new surveying workflows.

Challenges of Conventional Surveying Equipment

In civil engineering, construction sites, and surveying work, instruments such as total stations and GNSS surveying devices have traditionally been used. While these provide high-precision measurements, they are heavy and difficult to carry, making transport and setup at sites burdensome. Surveying operations often require multiple people (for example, an operator for the instrument and a staff member holding a prism at the survey point), which has been a strain amid current labor shortages. In addition, point cloud data that can only be obtained with dedicated equipment such as 3D scanners has been expensive and difficult to handle, posing high barriers for routine as-built management and earthwork volume calculations. Maintenance and calibration of equipment also require specialized knowledge, and importing survey data into a computer for drawing and sharing takes time. Moreover, accurately indicating or visualizing planned positions from drawings on the actual site requires experience, and there has been a lack of intuitive ways to grasp spatial relationships.

Smartphones Turn into Surveying Instruments: What Is the Latest Surveying Device LRTK?

Addressing these traditional challenges and reinventing surveying practice is LRTK. LRTK consists of a compact, smartphone-sized surveying device that fits in a pocket and a dedicated app, creating an all-purpose surveying tool used in combination with a smartphone. At about 125 g and 13 mm thick, it’s compact and, when attached to the back of a smartphone, quickly transforms the phone into a surveying instrument with centimeter-level accuracy. Handling positioning, point cloud measurement, and AR visualization, it is hailed as an “all-purpose surveying instrument” thanks to its portability. Tasks that previously required large equipment or multiple operators can now be completed with just an LRTK and a smartphone.

LRTK incorporates the latest RTK-GNSS technology, achieving high-precision positioning by applying real-time corrections to satellite positioning data. In Japan, it supports the centimeter-class augmentation service (CLAS) provided by the Michibiki quasi-zenith satellite system, enabling stable positioning even in mountainous areas outside of communication coverage. LRTK also features tilt compensation to correct positioning errors caused by device inclination. Because accurate coordinates can be obtained even when the device is slightly tilted, surveying in places where it’s difficult to hold a pole perfectly vertical becomes feasible. This enables smooth, high-precision positioning and surveying by a single person, which was previously difficult. Using the dedicated “LRTK app,” measured positioning data can be shared to the cloud in real time, and survey points or design data can be visualized with AR, enabling smart functions not seen before.

Main Features of LRTK

LRTK is said to “overturn conventional wisdom” because of its diverse functions and convenience. Here are LRTK’s main features in detail.

Outstanding portability in a compact, smartphone-sized form

One of LRTK’s biggest features is its compact size that can be nearly integrated with a smartphone. It is designed to attach with one touch to a dedicated smartphone case, and when not in use it can be carried in a pocket. Weighing about 125 g, it is lightweight and far easier to handle than conventional surveying instruments. Whether walking around a site to record survey points or carrying equipment deep into mountainous areas, LRTK does not become a burden.

Centimeter-level high-precision positioning

Despite its small size, its positioning accuracy is centimeter-level and professional-grade. LRTK contains a high-performance multi-band GNSS receiver that captures multiple frequency satellite signals to compute highly accurate position information. The RTK method provides real-time correction of positioning errors, allowing stable centimeter-level accuracy that is difficult to achieve with standalone positioning. It can directly receive correction information distributed from Michibiki (the quasi-zenith satellite), which is a major advantage for maintaining accuracy in sites with limited communication infrastructure. The tilt compensation function ensures positioning accuracy even when the antenna or device is slightly tilted. These combined technologies deliver positioning performance suitable for precision-required tasks such as creating survey maps or placing boundary stakes.

Solo-operation surveying

Introducing LRTK enables one-person operation of surveying tasks. Surveys that traditionally required two people (dividing measurement and observation roles) can be completed by one person using LRTK, from positioning to recording, all on a smartphone. For example, to measure the coordinates of a point, simply attach the LRTK device to the smartphone, place it at the point, and press a button in the app to instantly obtain high-precision coordinates. There’s no need to record points on paper and transcribe later. Retrieved coordinate values are automatically time-stamped and annotated with measurement status (such as number of satellites tracked and RTK fix/float status), preventing missing records or transcription errors at the site. If each worker carries one LRTK per person, overall team productivity is likely to improve.

AR support for intuitive spatial understanding

A distinguishing feature of LRTK is its support for AR (augmented reality) functions. Through the dedicated app and the smartphone camera, survey data and design information can be overlaid onto the real world, allowing intuitive site comprehension. For example, when approaching a survey point or control point acquired with LRTK, arrows or markers appear on the screen, guiding the user like a coordinate navigator to the target location. When searching for boundary markers or buried utilities, there’s no need to stare at maps; simply follow the on-screen directions to reach the intended coordinates.

Furthermore, if design drawings or 3D model data are loaded via the LRTK cloud, planned structures can be overlaid on live site imagery. For instance, pointing your smartphone at a pre-construction site can display the designed road or earthworks 3D models as if they exist there, making it easier to share the completed-image with clients and other staff. Because LRTK continuously knows its position to centimeter accuracy, AR-displayed models won’t shift as the user moves. Visual AR support lets you experience on-site the information that was previously only available on drawings, improving communication and decision-making quality. Sharing the same completed-image among all stakeholders on site also helps reduce rework caused by misunderstandings.

Point cloud scanning and analysis with a smartphone

LRTK can handle the increasingly popular point cloud surveying (3D scanning) using a smartphone. Modern high-performance smartphones and tablets now include LiDAR sensors in some models, enabling easy 3D scanning of the surrounding environment. However, scanning with a smartphone alone normally yields point clouds without absolute coordinates (latitude/longitude, etc.), and scanning over long walks can distort the data (positional drift). When used with LRTK, your position is tracked with high precision during scanning, so all points in the point cloud can be assigned accurate geographic coordinates. You can quickly scan terrain or structures with a pocket-sized device, measure desired cross-sections or distances between arbitrary points on the spot, and even perform volume calculations for embankments or accumulated sediment immediately.

Acquired point cloud data can be uploaded directly to the LRTK cloud for viewing and sharing in a web browser. Even without specialized point cloud processing software, you can measure distances, areas, and volumes on the cloud platform and display photos linked to the point cloud, enabling smooth use of 3D data between field and office. For example, when inspecting a bridge, capturing its shape as a point cloud and recording crack locations with photos lets you leave detailed records on the 3D data. Acquired point clouds and photos can be downloaded as needed and combined with CAD software or BIM/CIM models for further analysis. Tasks that previously required outsourcing to specialists can be conducted quickly in-house with LRTK.

Smart data management through cloud integration

LRTK functions not just as surveying equipment but as a platform integrated with cloud services. Positioning data, photos, and point cloud data captured at the site can be uploaded to the LRTK cloud with one tap. Colleagues in the office or clients can immediately check measurement results from a dedicated web page. This enables real-time information sharing between field and office, greatly reducing the time required to prepare reports and transfer data.

On the cloud, uploaded survey points are plotted on a map, and you can view lists of each point’s coordinates, elevations, notes, and more. You can calculate distances and elevation differences between points or compare with past survey data for analysis. If design data (such as road alignments or 3D models of structures) are uploaded to the cloud, comparing them with current point cloud data and synchronizing data for AR display can be automated. The LRTK cloud is a reliable digital tool that allows field-collected data to be directly used for construction planning and progress management.

Lightweight, simple design for easy maintenance

Because conventional surveying instruments are precision devices, they are often difficult to handle, requiring careful reading of manuals and periodic calibration. LRTK, by contrast, features a simple design operable intuitively via a smartphone app, allowing even first-time users to start without hesitation. The device itself is robust and simply constructed, so the complicated maintenance and adjustments typical of dedicated equipment are almost unnecessary. The built-in battery provides long runtimes and can be charged as easily as a smartphone. It is designed to withstand some rough handling in the field, so it can be used reliably in harsh civil engineering environments. Minimizing equipment trouble and downtime contributes to improved reliability on site.

Use Cases Expanded by AR and Point Cloud Technology

Thanks to its rich feature set, LRTK is expected to be useful in a wide range of civil engineering and surveying scenarios. Tasks that previously required outsourcing or expensive equipment can be performed in-house as part of routine operations with LRTK. Below are some anticipated use cases.

• Pre-construction planning and as-built management: Before starting work, use LRTK to scan the existing terrain as point clouds and overlay the design 3D model in AR to check whether construction can proceed as designed. During construction, perform as-built surveys with LRTK and compare the resulting point clouds to the design model for quality control. Performing volume calculations as needed streamlines excavation and embankment volume management and the preparation of as-built reports.

• Infrastructure inspection and maintenance management: LRTK is powerful for regular inspections of bridges, tunnels, and other infrastructure. Photos taken at inspection points can be recorded with accurate coordinates and orientation, making it easy to reproduce the same position and angle as previous photos to compare changes over time. Following AR arrow guides to align the camera allows you to capture images with precisely the same composition as prior inspections, enabling quantitative assessment of deterioration. Storing damaged areas as point cloud data allows detailed displacement analysis later in the office. Transitioning from paper records to digital data promotes DX (digital transformation) in infrastructure health monitoring.

• Disaster investigation and recovery support: LRTK’s portability makes it suitable for disaster site surveys such as landslides and river flooding. Rapidly deploy to affected areas, walk and 3D-scan large areas to obtain point cloud data of damage, calculate soil volumes on the spot, and mark hazardous locations for cloud sharing. Speed is critical in disaster response, and the ability for a single worker to measure and record the entire site without waiting for heavy equipment or complex surveying setups is a major advantage. Cloud-shared data also helps remote experts analyze conditions and facilitates information sharing with relevant agencies.

• Land surveying and boundary verification: For land surveys and boundary marker verification, LRTK is useful. If known control points or boundary coordinates are pre-registered in the cloud, AR navigation will appear on the smartphone when you approach those points. This helps you locate boundary stakes buried by weeds or terrain changes without missing them. New survey points can be measured and recorded as electronic deliverables and saved directly to the cloud, supporting prompt delivery and reporting.

• Other use cases: Beyond the above, LRTK is effective wherever surveying and measurement are needed. For example, a self-employed surveyor could carry it and perform on-site surveys immediately upon receiving a request, offering high mobility. Combining LRTK with drones can expand survey coverage, or multiple LRTK units can be used concurrently at separate locations to increase efficiency in large-scale data collection. LRTK’s flexible workflows make it adaptable to many tasks previously unthinkable with conventional equipment.

Operational Efficiency Gains and a New Normal Brought by LRTK

As described, LRTK’s arrival is transforming surveying sites. As a one-device-per-person surveying tool that is easy to carry, LRTK greatly streamlines tasks that used to require time and manpower. Situations where you arrive on site and find “not enough equipment” or “not enough people” will be reduced, and the ability to survey and measure whenever needed will accelerate work and help reduce overtime. Because site conditions can be shared in real time, supervisors and clients in remote locations can view the same information and communicate, contributing to faster decision-making.

LRTK is not merely a convenient surveying gadget; it has the potential to change how the construction industry works as a whole. With the push for on-site DX, making affordable, easy-to-use surveying equipment a standard on-site tool could shift measurement tasks from specialists to routine in-house operations. For young technicians, the intuitive, smartphone-style operation helps them acquire surveying skills more naturally, supporting human resources development. As smartphone-integrated surveying devices like LRTK become widespread, the very conventions of surveying are expected to be updated to new styles.

Conclusion: The Next Generation of Surveying Starts with a Smartphone

The latest surveying device LRTK is a groundbreaking tool that enables “anyone, anywhere, easily” to perform high-precision surveying using a smartphone. It addresses the problems of conventional surveying equipment and dramatically improves field work efficiency and accuracy by leveraging AR and point cloud technologies. Not only surveying professionals such as civil engineering companies, municipalities, and surveyors, but also individual field technicians will be able to work in ways previously unimaginable if each carries an LRTK.

Its ease of getting started with just a compact device and a smartphone is another attractive point, overturning the old assumption that “surveying is only for specialists.” If you are considering introducing or updating surveying equipment at your site, consider adding this smartphone-integrated next-generation surveying tool LRTK to your options. An impressively smart and comfortable surveying experience is likely waiting for you.