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

The conventions of surveying sites are undergoing a major change. Until now, surveying equipment typically meant large instruments mounted on tripods or specialized devices handled by multiple people. However, in recent years, combining smartphones with compact devices has made high-precision surveying accessible to anyone. In particular, the use of AR (augmented reality) technology and 3D point cloud data is attracting attention, and innovative tools are emerging one after another in the increasingly digital construction industry. A prime example is the latest surveying device LRTK, which performs centimeter-level positioning and point cloud scanning with a smartphone. As a pocket-sized device that enables everything from high-precision surveying to AR visualization, it is attracting significant attention as a solution that overturns conventional wisdom. Sites that have already adopted 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, total stations and GNSS surveying instruments have traditionally been used. While these allow high-precision measurements, they are heavy and difficult to transport, making it cumbersome to bring equipment to and set it up at sites. Also, surveying often requires multiple people (for example, an operator for the instrument while a staff member stands at the survey point with a prism), which has become a burden amid widespread labor shortages. Furthermore, point cloud data that previously could only be obtained with specialized 3D scanners has been expensive and difficult to handle, posing high barriers for routine as-built management and volume calculations. Maintenance and calibration of equipment also require expertise, and it can take time to import survey data into a computer for drafting and sharing. In addition, accurately indicating or visualizing planned positions from drawings on site requires experience, so the lack of intuitive ways to grasp spatial information has been pointed out.

A Smartphone Turns into a Surveying Instrument: What Is the Latest LRTK?

Solving these conventional problems and revolutionizing surveying is LRTK. LRTK consists of a compact, smartphone-sized surveying device that fits in your pocket and a dedicated app, forming a “universal surveying instrument” used together with a smartphone. With a compact size of about 125 g and a thickness of about 13 mm (0.51 in), it transforms into a surveying device with centimeter-level accuracy (half-inch accuracy) simply by attaching it to the back of a smartphone. Because it handles everything from position measurement and point cloud surveying to AR visualization, its portability has earned it the nickname “universal surveying instrument.” Tasks that once required large equipment and multiple people can now be completed with an LRTK and a single smartphone.

LRTK incorporates the latest RTK-GNSS technology, achieving high-precision positioning by applying real-time corrections to satellite positioning data. In Japan, it is compatible with the centimeter-level augmentation service (CLAS) provided by the Quasi-Zenith Satellite System “Michibiki,” enabling stable positioning even in mountainous areas without cellular 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 locations where it is difficult to hold a pole perfectly vertical becomes less problematic. This makes high-precision single-person surveying and stakeout—which was difficult before—smooth to perform on site. Using the dedicated “LRTK app,” positioning data can be shared to the cloud in real time, and survey points and design data can be visualized through AR, offering smart functions previously unavailable.

Main Features of LRTK

The reason LRTK is said to “overturn conventional wisdom” lies in its versatile functions and convenience. Here are LRTK’s main features in detail.

Extremely Portable in a Compact, Smartphone-Sized Form

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

Achieves Centimeter-Level High-Precision Positioning (Half-Inch Accuracy)

Despite its small size, its positioning accuracy is truly centimeter-level (half-inch accuracy). LRTK contains a high-performance multi-band GNSS receiver that captures satellite signals on multiple frequencies to compute high-precision position information. The RTK method provides real-time corrections to positioning errors, enabling stable centimeter-level accuracy that is difficult to achieve with standalone positioning. It can also directly receive correction information distributed from Michibiki, so it maintains accuracy even at sites without established communication infrastructure. Tilt compensation ensures positioning accuracy even when the antenna or device is slightly inclined. These combined technologies deliver the positioning performance required for precise tasks such as preparing survey drawings and installing boundary stakes.

Surveying Tasks Done by One Person

With LRTK, surveying work can be one-person operation. Surveys that used to require two people (dividing measurement and observation duties) can be completed by a single person from positioning to recording using LRTK and a smartphone. For example, to measure the coordinates of a point, simply attach the LRTK device to your smartphone, place it at the point, and press a button in the app to instantly obtain high-precision coordinates. There is no need to record points with paper and pencil or transcribe data later. The recorded coordinates automatically include timestamps and measurement status (such as number of satellites tracked and RTK fix/float state), preventing missed records or transcription errors on site. If each worker carries one LRTK, 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). Through the dedicated app and the smartphone camera, survey data and design information can be overlaid onto the real world for intuitive on-site understanding. For example, when approaching a survey or control point obtained with LRTK, arrows or markers appear on the screen to guide you to the target like a coordinate navigator. When searching for boundary markers or buried objects, there is no need to stare at maps—just follow the on-screen directions to arrive at the targeted coordinates.

Moreover, by loading design drawings or 3D model data via the LRTK cloud, planned structure models can be overlaid onto live onsite images. For example, pointing your smartphone at a pre-construction site can display the designed road or earth structure 3D models as if they were actually there, making it easier to share the final image with clients and other staff. Because LRTK constantly knows its own position with centimeter accuracy (half-inch accuracy), AR-displayed models will not drift as the user moves. Visual support through AR lets you experience information that used to be available only on drawings, improving communication and decision-making quality. When all stakeholders on site share the same final image, rework due to misunderstandings can be reduced.

Point Cloud Scanning and Analysis with a Smartphone

LRTK also enables point cloud surveying (3D scanning) using a smartphone. Modern high-performance smartphones and tablets now come with LiDAR sensors on some models, allowing easy 3D scanning of the surrounding environment. However, scanning with a smartphone alone typically has issues such as the resulting point cloud lacking absolute coordinates (latitude/longitude), or data distortion when walking long distances while scanning. By using LRTK together, your position is precisely known at all times during scanning, so accurate geographic coordinates can be attached to every point in the point cloud. You can quickly scan terrain and structures with a pocket-sized device, measure cross-sections or distances between arbitrary points on the spot, and even perform immediate volume calculations for embankments or deposited sediments.

Captured point cloud data can be uploaded directly to the LRTK cloud for viewing and sharing in a web browser. Even without dedicated point cloud processing software, you can measure distances, areas, and volumes on the cloud and view photos linked to the point cloud, enabling smooth use of 3D data between the field and the office. For example, when inspecting a bridge you can capture the bridge shape as a point cloud and record cracks with photos, leaving precise records on the 3D data. The acquired point cloud and photo data can be downloaded as needed and analyzed in combination with CAD software or BIM/CIM models. Tasks that previously required specialist contractors for 3D measurement can be carried out quickly in-house with LRTK.

Smart Data Management through Cloud Integration

LRTK functions not just as a surveying device but as a platform integrated with cloud services. Positioning data, photos, and point cloud data obtained on site can be uploaded to the LRTK cloud with one tap. Colleagues in the office or clients can instantly check measurement results through a dedicated web page. This enables real-time field-office information sharing, drastically reducing the time spent on report preparation and data transfer.

On the cloud, uploaded survey points are plotted on a map, and coordinates, elevations, notes, etc., can be listed. You can calculate distances and elevation differences between points or compare with past survey data. Additionally, if design data (such as road alignment or 3D structural models) is uploaded to the cloud, comparisons with current point clouds and data synchronization for AR display can be automated. The LRTK cloud is a powerful digital tool that helps convert on-site collected data directly into construction planning and progress management.

Lightweight and Simple Design for Easy Maintenance

Conventional surveying instruments are delicate and require careful handling, frequent reference to manuals, and periodic calibration. In contrast, LRTK’s simple design is intuitively operable via a smartphone app, allowing even first-time users to start without confusion. The device itself is robust and has a simple structure, minimizing the complex maintenance and adjustments often associated with specialized equipment. Its internal battery provides long runtime and is easily recharged like a smartphone. The device is designed to withstand some rough handling on site, making it reliable even in harsh civil engineering work environments. This reduces equipment troubles and downtime to a minimum and contributes to improved on-site reliability.

Expanded Use Cases with AR and Point Cloud Technology

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

• Construction planning review and as-built management: Before construction starts, scan the current terrain with LRTK to create a point cloud and overlay it with the 3D design model in AR to check whether construction can proceed as designed. During construction, perform as-built measurements with LRTK as needed, and compare obtained point clouds with the design model for quality control. Performing volume calculations as required helps manage excavation and fill quantities and streamline the creation of as-built reports.

• Infrastructure inspection and maintenance: LRTK is powerful for regular inspections of bridges, tunnels, and other infrastructure. Photos taken at inspection points can be recorded with precise coordinates and orientation, enabling sophisticated maintenance such as taking photos from the exact same position and angle as the previous inspection to compare changes over time. Following AR arrow guidance to match the camera angle to the previous survey allows you to quantitatively assess deterioration. Storing damaged areas as point cloud data enables detailed displacement analysis later in the office. Moving from paper forms to digital data promotes DX (digital transformation) in monitoring infrastructure health.

• Disaster investigation and recovery support: LRTK’s portability makes it suitable for disaster site investigations such as landslides and river floods. Rapidly deployed to affected areas, a single operator can walk the site to perform 3D scans over wide areas, measure sediment volumes on the spot, mark hazardous locations, and share data via the cloud. Speed is critical in disaster response, and the ability of one operator to measure and document the entire site without waiting for heavy machinery or large surveying equipment is a major advantage. Cloud-shared data also helps remote experts analyze conditions and enables information sharing among relevant agencies.

• Land surveying and boundary verification: LRTK is useful for land surveys and boundary stake checks. If coordinates of known control points or boundary markers are pre-registered in the cloud, AR navigation will appear on the smartphone screen as you approach those points on site. This helps you locate boundary stakes hidden by weeds or terrain changes. You can measure and record new survey points as needed and save them directly to the cloud as electronic deliverables, supporting quick delivery and reporting.

• Other use cases: Beyond the above, LRTK excels wherever surveying and measurement are needed. For example, a sole proprietor surveyor could carry an LRTK to promptly perform surveys and deliver results on site. Combining LRTK with drones can expand the survey area, or multiple LRTK units can simultaneously survey different locations to efficiently collect large-scale data. LRTK’s flexibility enables styles of work that were unthinkable with conventional equipment, adapting to diverse tasks.

Operational Efficiency and a New Norm Brought by LRTK

With the advent of LRTK, the surveying field is undergoing significant change. As a one-device-per-person surveying tool that is easy to carry, LRTK dramatically streamlines work that previously consumed time and manpower. Situations where you arrive at a site and find “not enough equipment” or “not enough people” will decrease, and the ability to survey whenever needed boosts operational speed and helps reduce overtime. Real-time sharing of site status also allows remote supervisors or clients to review the same information, speeding up decision-making.

LRTK is more than a convenient surveying gadget; it has the potential to change the way the entire construction industry works. As on-site DX advances, making affordable and easy-to-use surveying equipment a standard tool on site shifts measurement tasks from being specialists’ responsibilities to routine operations. For younger engineers, the intuitive smartphone-based operation fits the smartphone generation, supporting skill development and personnel training. As smartphone-integrated surveying devices like LRTK become widespread, traditional surveying norms are expected to be updated to new styles.

Conclusion: Start Next-Generation Surveying with Just a Smartphone

The latest surveying device LRTK is a revolutionary tool that enables “anyone, anywhere, easily” to perform high-precision surveying using a smartphone. It resolves the problems of traditional surveying equipment and dramatically enhances on-site efficiency and accuracy by leveraging AR and point cloud technologies. Whether you are a civil engineering firm, a municipal agency, or a surveying professional, equipping each on-site technician with LRTK will enable a fundamentally different way of working.

Its ease of use—only a compact device and a smartphone required—also challenges the old notion that “surveying is only for specialists.” If you are considering introducing or upgrading surveying equipment on your site, consider adding this next-generation smartphone-integrated surveying tool, LRTK, to your options. A surprisingly smart and comfortable surveying experience awaits you.