Amazing Introduction Effects! Astonishing Real Examples of How the Surveying Device LRTK Has Changed the Field

In recent years, the introduction of new technologies has produced dramatic effects in civil engineering, construction sites, and surveying work. Among them, the innovative device that is overturning conventional wisdom about surveying equipment is LRTK. This compact surveying device LRTK, used in combination with a smartphone, has quietly become popular among construction sites and surveyors by dramatically improving on-site work efficiency and enhancing safety. In this article, using several field examples such as bridge construction, land surveying for development, and disaster sites, we will concretely present surprising real cases of how sites have changed after introducing LRTK.

Features and Innovativeness of the Surveying Device LRTK

LRTK is a pocket-sized, all-purpose surveying instrument that can be attached to a smartphone. Simply attach the dedicated ultra-compact RTK-GNSS receiver to a smartphone, and it performs as well as or better than conventional large surveying instruments. Here are some of its innovative features.

• Centimeter-level high-precision positioning: LRTK uses RTK (real-time kinematic) technology to obtain position information with centimeter-level accuracy. Latitude, longitude, and height can be recorded in a high-precision global coordinate system, with errors around 1 cm—genuine surveying-grade accuracy. This level of precision sets it apart from conventional GPS positioning and makes it suitable even for precise civil engineering surveys.

• Lightweight, compact, and integrated with smartphones: The device itself is lightweight at about 125 g and only a few millimeters thick. The receiver can be attached to a dedicated smartphone cover with a single touch, and its compact size allows it to fit in a pocket. It has a built-in battery, so it can be carried and used whenever needed. Its ease of use is such that you may forget you're carrying surveying equipment, making it practical as a "one device per person" tool on site.

• Positioning possible even where GPS is unavailable: One of the greatest innovations is that LRTK can perform positioning even in places where GPS signals typically do not reach. For example, under bridges, inside tunnels, or in the shadow of buildings—environments that were traditionally difficult for surveying—LRTK can obtain a reference position at a location where GPS reception is possible and then continue surveying while moving using the camera and sensors in its indoor positioning mode. This enables surveying in places that were previously abandoned, dramatically expanding the range of on-site work.

• Simple operation for 3D point-cloud measurement: It also includes a point-cloud scan function using the smartphone camera. By simply walking around the site holding a smartphone with LRTK attached, high-precision 3D point-cloud data can be automatically generated. Because the acquired point cloud is assigned absolute coordinates (world coordinates), it can be used directly for later drawing creation or volume calculations. Tasks that formerly required specialized 3D laser scanners or drones can now be easily performed by anyone with a single LRTK unit.

• Cloud integration and AR utilization: Data collected with LRTK can be immediately uploaded to a dedicated web system in the cloud, allowing real-time sharing and verification of on-site surveying results from the office. When photos are taken, the positioned photo function automatically records the shooting location and orientation and plots them on a cloud map. Furthermore, augmented reality (AR) features make it possible to overlay design models on the actual scene for on-site as-built simulation and other advanced uses. With these diverse functions, data obtained from simple surveying can be used instantly, enabling efficient operations that bridge the gap between the field and the office.

As shown, LRTK is the latest surveying equipment that combines high accuracy, ease of use, and versatility. Now, let's look step by step at what specifically improves compared to conventional surveying methods.

Problems with Conventional Surveying Equipment and Methods

First, to understand the effects of introducing LRTK, let's organize the challenges that sites faced with conventional surveying equipment and methods. Traditional equipment and methods had the following issues.

• Requires manpower and time: With total stations and conventional GNSS surveying devices, setting up the equipment and surveying typically required multiple personnel. Procedures such as having staff carry prisms or staffs for each survey point while another operator handles the instrument inevitably consumed time and effort. In complex sites, it was not uncommon to spend long hours on a single day's surveying work.

• Large equipment and specialized knowledge required: High-precision surveying required transporting and installing heavy equipment (tripod-mounted instruments, batteries, antennas, etc.) on site. Operating the equipment was often specialized, requiring experienced surveyors. The high barrier to equipment preparation and operational proficiency meant that each site often had to request a specialized department, increasing administrative burden.

• Many locations could not be measured: Conventional surveying struggled in places where satellite signals did not reach or where footing was insufficient. For example, under bridge decks, under viaducts, in dense forests, or at disaster sites with many obstacles, conventional instruments could fail to obtain position information, or it could be impossible to place the instrument at the point to be measured, forcing abandonment. Surveying at heights or dangerous locations required extensive preparations such as erecting scaffolding or arranging aerial work platforms.

• Data processing and sharing took time: Conventional methods involved manually noting data in the field and then entering and organizing it on a PC back at the office. If photos were taken, their locations were recorded on paper maps and later matched with photos, making report creation time-consuming. There was a time lag before data could be shared between the field and the office, making real-time information coordination difficult.

These challenges made surveying work have the image of "a laborious, risky specialist task." So what changes when LRTK is introduced? Below, we look at specific on-site cases and the changes before and after introduction.

LRTK Introduction at Bridge Construction Sites — Dramatic Reduction in Dangerous High-Place Surveys

At bridge construction sites, surveying at heights such as on or under bridge girders is unavoidable. However, these high-place surveys traditionally involved great difficulties.

Introduction issues: For example, when measuring the lower structure of a bridge, survey staff needed to set up scaffolding under the bridge or be lifted by an aerial work vehicle for visual measurement. For positioning of the superstructure or checking bolt positions, staff often had to climb onto the girders with reflector prisms or operate while communicating with a ground-based total station. These tasks involved significant effort and risk, requiring meticulous planning and manpower to perform accurately within limited time. Measuring corners or the undersides of girders that were out of reach was extremely difficult, and in some cases had to be abandoned.

Changes after introducing LRTK: Even at such bridge construction sites, the situation changes dramatically when LRTK is introduced. First, LRTK’s indoor positioning mode enables positioning in places where GPS signals do not reach, such as under bridges. Field staff set their current position at a location where satellite reception is possible, then move under the bridge holding a smartphone equipped with LRTK. Under the bridge, their position is displayed on the smartphone screen in real time as X, Y, Z coordinates, and tapping the button at the target point records that point’s coordinates. This eliminates the need to erect scaffolding or remain at dangerous heights for long periods, allowing a single person to complete surveying safely.

Additionally, using LRTK’s camera function makes it possible to measure coordinates of distant points without contact. For example, even corner points on the upper part of a girder that are out of reach can have their latitude, longitude, and height measured from the ground simply by pointing the smartphone. Tasks that previously required tapes or temporary scaffolding can now be completed with one touch, enabling quick measurements during construction and fast completion inspections. After introducing LRTK, sites have reported positive feedback such as "dangerous location surveys have been greatly reduced, easing safety management burdens" and "time required for as-built verification at heights has decreased to less than half of what it used to be."

Moreover, point-cloud data and coordinate-tagged photos acquired with LRTK can be shared in the cloud immediately, allowing progress and construction accuracy for bridges to be checked from the office. By recording the shapes of piers and girders as point clouds and preserving detailed photos of areas of concern, on-site recording and reporting have been dramatically streamlined. The effect of introducing LRTK at bridge construction sites extends beyond a reduction in hazardous work; it also improves the quality and usability of surveying data, positively impacting overall construction management.

LRTK Use in Land Surveying for Development — Greater Efficiency with Fewer People and Easier Boundary Verification

LRTK also delivers remarkable effects in land surveys for private development and public works. Tasks measuring land boundaries and terrain have traditionally required many personnel and time, but LRTK is overturning that norm.

Introduction issues: Conventional land surveys typically involved a team of two to three people including a surveyor visiting the site with a total station and staff band to measure boundary points and terrain. Each point required re-setting the instrument, recording by hand in a field notebook, and later drafting in the office. Naturally, the more survey points there are, the more days and labor costs increase. Finding boundary markers hidden in forests or shrubs was also a challenge, with the risk of overlooking stakes concealed by vegetation. Returning to the same place for re-survey or boundary confirmation made it difficult to precisely locate previous survey points in the field, wasting time.

Changes after introducing LRTK: With LRTK-based land surveys, much of this effort is eliminated. First, surveying can be done by a single operator holding only a smartphone and LRTK, enabling efficient work with a small crew (in some cases, one person). When reaching a boundary marker or survey point, tapping the button on the smartphone screen instantly records the point’s coordinates. The app automatically handles conversion to the plane rectangular coordinate system and geoid correction for elevation, so field-acquired data can be used directly as final deliverables. There is no longer any need for handwritten field notes or later coordinate calculations.

Uploading data to the LRTK cloud immediately plots survey points on a map on the office PC. This enables drawing creation and stakeholder sharing on the same day the survey is performed, dramatically shortening the lead time for land surveys. Also, if previously surveyed reference points or boundary coordinates are retrieved from the cloud, the app’s coordinate navigation function will guide the user to those points in the field. Even boundary stakes hidden in vegetation can be found by following the arrows on the smartphone screen, eliminating the worry of overlooking them. Because previous survey points can be accurately revisited across multiple surveys, continuous monitoring and long-term comparisons are smooth.

Thus, LRTK is transforming land surveying from a task that "required a skilled team" into one that "anyone can perform alone." Beyond cost savings from efficiency gains, access to real-time, accurate surveying data improves planning and design accuracy. Municipal staff can confirm road boundary lines in a short time, and construction company technicians can scan the ground themselves before and after construction to calculate earthwork volumes—expanding the scope of surveying operations and removing bottlenecks.

LRTK Use at Disaster Sites — Speeding Up Initial Surveys and Improving Safety

At large-scale disaster sites such as earthquakes and landslides, it is essential to grasp the damage quickly. However, such harsh environments are where conventional surveying equipment is most difficult to use. LRTK’s portability and technical features demonstrate great power in initial surveys and recovery support during disasters.

Introduction issues: Immediately after a disaster, it is difficult to bring large surveying equipment to the site. In disaster areas, the ground is often unstable and debris is scattered, leaving little time for the leisurely setup of tripods. Additionally, power outages or damaged base stations can disable communication infrastructure, preventing reception of GNSS correction data via network connections. As a result, accurate position information had to be abandoned in favor of rough visual surveys, which carry large errors that can hinder later detailed surveys and recovery planning. Because surveys themselves are hazardous, time on site must be minimized.

Changes after introducing LRTK: The compact, easy-to-carry LRTK proves invaluable at disaster sites. Investigators can carry the pocket-sized device, walk the site, and quickly capture coordinates and surrounding point clouds for necessary locations. For example, even immediately after a major earthquake, LRTK allows a single person to rapidly record the site. In fact, during the 2023 offshore Noto Peninsula earthquake, LRTK was used in on-site surveys under conditions where communication networks were unavailable. Even when mobile communications were down, LRTK could receive centimeter-level correction signals (CLAS) distributed from Japan’s quasi-zenith satellite system "Michibiki," enabling high-precision positioning without the Internet. This allowed disaster areas to be accurately recorded and saved with positional data, enabling the later creation of detailed damage maps.

Point-cloud scans and photo records from LRTK also help with a three-dimensional understanding of disaster sites. Tasks such as creating 3D data of a collapsed slope or preserving cracked structures with coordinate-tagged photos—previously requiring specialized contractors—can be completed during initial response. By sharing data later via the cloud, remote headquarters can instantly confirm and analyze the situation. This is an extremely valuable advantage in disaster response, where conditions change by the hour.

Furthermore, using LRTK’s navigation function makes it easy to return to the exact same point in follow-up surveys. Recovery work often requires visiting the same locations multiple times to record progress, and selecting coordinates saved in the LRTK app will guide investigators to those points, preventing loss of survey points even when personnel change. As a result, disaster response surveying becomes more efficient while enhancing the safety of surveyors.

In these ways, LRTK exerts significant power even in emergency surveying and recording. Its small size allows rapid deployment to the field, and its ability to perform surveying when infrastructure is down has earned high praise from administrative bodies, fire departments, and police involved in disaster response. Exceeding the role of mere surveying equipment, LRTK is increasingly recognized as a tool that supports protecting lives and infrastructure.

Toward a New Era of Simple Surveying Realized by LRTK

As we have seen, the effects of introducing LRTK are tremendous across various sites. As demonstrated by real-world examples in bridge construction, land surveying, and disaster response, LRTK has the potential to fundamentally change surveying work. With high-precision position information now easily accessible to anyone, the preconception that "surveying is only for specialist technicians" is beginning to crumble. Field workers themselves can quickly perform necessary surveys and immediately share and utilize the data—ushering in a genuine new era of simple surveying.

With LRTK, situations that once required waiting for a surveying team can be measured on the spot. For example, construction managers can scan current conditions with their own smartphones to calculate quantities, or municipal staff can inspect infrastructure alone. The concept of "one surveying device per person" is becoming a reality, dramatically improving site productivity and helping solve industry issues such as labor shortages and reliance on experienced personnel.

Moreover, the convenience LRTK offers contributes not only to efficiency but also to improved site safety and data quality. Real-time access to accurate data accelerates decision-making and reduces mistakes. Digital data management that does not rely on paper field notebooks or memos will become a valuable asset for future infrastructure maintenance. These changes represent an impactful reform in on-site work practices.

Finally, we encourage civil engineering professionals and surveyors reading this article to consider using LRTK in light of your site’s challenges. As the surprising real examples presented here show, the benefits of introducing the surveying device LRTK will be felt once you try it. The dramatic way cutting-edge technology can transform sites is not limited to special projects—everyday operations can realize safe, efficient simple surveying and take a major step toward improving fieldwork. Experience the new surveying style LRTK brings to your site and feel its convenience and impact for yourself.