The Introduction Effects Are Amazing! Surprising Real-World Examples of How the LRTK Surveying Instrument Changed Job Sites

In recent years, the introduction of new technologies in civil engineering, construction sites, and surveying work has produced dramatic effects. Among them, the device drawing attention as an innovative product that overturns conventional wisdom about surveying instruments is LRTK. This pocket-sized surveying device LRTK, used in combination with a smartphone, has quietly become a boom among construction sites and surveyors by dramatically improving on-site work efficiency and enhancing safety. In this article, using several real-world examples such as bridge construction, land surveying, and disaster sites, we will concretely introduce how job sites have changed after LRTK was introduced.

Features and Innovativeness of the LRTK Surveying Instrument

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-scale surveying equipment. Here are some of its innovative features.

• Centimeter-level high-precision positioning (cm level accuracy (half-inch accuracy)): LRTK uses RTK (real-time kinematic) technology to acquire position information with centimeter-level precision. Latitude, longitude, and elevation can be recorded in a high-precision global coordinate system, with errors around 1 cm (0.4 in), reaching a professional surveying level. This accuracy is in a class apart from conventional GPS positioning and is suitable for precision civil surveying.

• Lightweight, compact, and integrated with your phone: The device itself is lightweight at about 125 g and has a thickness of only a few millimeters. The receiver can be attached to a dedicated smartphone cover with a one-touch action, making it compact enough to fit in a pocket. It also has a built-in battery, so you can carry it and use it whenever needed. The ease of use is such that you can forget you are carrying a surveying instrument, and it can be used on-site as a standby tool with “one device per person.”

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

• Easy operation for 3D point-cloud measurement: It also features a point-cloud scanning function that uses the smartphone camera. By simply walking around the site with a smartphone equipped with LRTK in one hand, high-precision three-dimensional 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 and volume calculations. Tasks that previously required specialized 3D laser scanners or drones can now be performed easily by anyone with a single LRTK unit.

• Cloud integration and AR utilization: Data acquired with LRTK can be uploaded instantly to a dedicated web system in the cloud, allowing real-time sharing and verification of on-site survey results from the office. When you take photos, the shooting location and orientation are automatically recorded by the positioning photo function and plotted on a map in the cloud. Furthermore, AR (augmented reality) features allow advanced uses such as overlaying design models on the real scene at the site to simulate the finished state. With these diverse functions, data obtained through simple surveying can be used immediately, enabling efficient operations that transcend the boundary between site and office.

In this way, LRTK is the latest surveying instrument that combines high precision, ease of use, and versatility. Now, let us look step by step at what specifically improves compared to conventional surveying methods.

Problems with Conventional Surveying Instruments and Methods

First, to understand the effects of LRTK introduction, we will organize the issues that sites faced with conventional surveying instruments and methods. The following are typical problems with traditional equipment and methods.

• Requires manpower and time: With total stations and conventional GNSS surveying instruments, multiple personnel were required to set up the equipment and carry out surveying. The procedure of staff moving with prisms or staffs for each survey point while another person operates the instrument necessarily took time and effort. In complex sites, it was not uncommon for surveying work to take many hours in a single day.

• Large-scale equipment and specialized knowledge required: High-precision surveying required transporting and installing heavy equipment (such as surveying instruments on tripods, batteries, and antennas) to the site. Operation of the equipment was often specialized and could only be handled by experienced surveyors. The high hurdles of equipment preparation and operational proficiency meant that requests to a specialized department were required for each site.

• Many places could not be measured: Conventional surveying faced difficulties in places where satellite signals did not reach or where footing was insufficient. For example, under bridge substructures, under viaducts, in dense forests, or at disaster sites with many obstructions, conventional equipment could not obtain position information, or it was impossible to place the instrument directly at the desired point, forcing abandonment in some cases. Measuring at heights or dangerous locations required large preparations such as installing scaffolding or arranging aerial work platforms.

• Data processing and sharing took time: With conventional methods, field data were recorded manually and then entered and organized on a PC back at the office. When taking photos, the shooting location had to be recorded on paper maps and later cross-checked with photos, making report creation time-consuming. There was a time lag before data could be shared between site and office, making real-time information linkage difficult.

Because of these issues, surveying work had the image of being “a time-consuming, dangerous specialized task.” So what actually changes when LRTK is introduced? Below we look at specific site case studies to see the changes before and after adoption.

LRTK Introduced on a Bridge Construction Site – Dangerous High-Altitude Surveying Greatly Reduced

On bridge construction sites, surveying work at heights such as on or under bridge girders is unavoidable. However, these high-altitude surveys were a major challenge in the past.

Introduction challenges: For example, when measuring the lower structure of a bridge, surveying staff had to construct scaffolding under the bridge or be hoisted by an aerial work platform to visually inspect and measure. For setting out positions on the superstructure or checking bolt locations, workers had to climb onto girders with reflective prisms or communicate with a ground total station while conducting work. These tasks involved labor and danger and required detailed planning and manpower to complete accurately within limited time. Measuring hard-to-reach areas such as corners of girders or the underside of beams was extremely difficult and sometimes had to be abandoned.

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

Furthermore, using LRTK’s camera function, it is possible to measure coordinates of distant points without contact. For example, even for an unreachable corner point on a girder, you can point the smartphone from the ground and measure the latitude, longitude, and elevation of that point. Tasks that previously required tapes or temporary platforms can be done with one touch, enabling speedy measurements during construction and final inspections. In practice, after LRTK was introduced, feedback from sites included comments such as “measurements at dangerous locations have been greatly reduced, easing the burden of safety management” and “time required for checking high-altitude as-built conditions has been cut to less than half of before.”

In addition, point-cloud data and coordinate-tagged photos acquired with LRTK can be shared instantly in the cloud, allowing progress and construction accuracy of bridge work to be confirmed from the office. Recording the shapes of piers and girders as point clouds and preserving detailed photos of areas of concern has dramatically improved on-site records and reporting. The introduction of LRTK at bridge construction sites has not only drastically reduced dangerous work but also improved the quality and usability of surveying data, positively impacting overall construction management.

LRTK Use in Land Surveying – Fewer People, Increased Efficiency, and Easier Boundary Confirmation

In land surveying for private development and public works, LRTK also delivers remarkable results. Tasks such as measuring land boundaries and topography used to require substantial manpower and time, but LRTK is overturning that conventional wisdom.

Introduction challenges: Conventional land surveying typically involved a team of two to three people including a surveyor, using a total station and staff bands to measure boundary points and topography. The instrument had to be repeatedly set up for each point, notes taken by hand in field books, and drawings created later at the office. Naturally, the more survey points there were, the more days were required and the higher the labor cost. Searching for boundary markers hidden in forest or undergrowth was also a major challenge, with the risk of overlooking stakes covered by vegetation. Returning to the same location for re-survey or boundary confirmation made it difficult to accurately identify previous survey points, sometimes wasting time in the field.

Changes after LRTK introduction: Land surveying with LRTK dramatically reduces these burdens. First, surveying can be performed by a single operator holding only a smartphone and LRTK, enabling efficient work with a small crew (in some cases, one person). When arriving at a boundary marker or survey point, tapping a button on the smartphone screen instantly records the point’s coordinates. The app automatically performs conversions to the plane rectangular coordinate system and geoid corrections for elevation, so data obtained on site can be used directly as final deliverables. There is no longer any need for field book handwriting or later coordinate calculations.

When data are uploaded to the LRTK cloud, survey points are immediately plotted on a map on the office PC screen. This allows drawings and sharing with stakeholders to be completed on the same day the survey was conducted, dramatically shortening the lead time for land surveying. Also, if previously surveyed control points or boundary coordinates are called up from the cloud, the app’s coordinate navigation function will guide you to those locations. Even boundary stakes hidden in vegetation can be found by following the arrow shown on the smartphone screen, eliminating the worry of missing them. Because previous survey points can be revisited accurately across multiple surveys, follow-up investigations and long-term comparisons are smooth.

Thus, with the introduction of LRTK, land surveying is shifting from “work performed by a team of skilled personnel” to “work anyone can perform alone.” In addition to cost reductions from efficiency gains, having real-time accurate surveying data improves planning and design accuracy. Municipal staff can quickly confirm boundaries for planned roads, and construction company engineers can scan the ground themselves before and after construction to calculate earthwork volumes. This resolves surveying bottlenecks and expands the scope of surveying work.

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

At large-scale disaster sites such as earthquakes and landslides, rapid assessment of damage is essential. However, such harsh environments were also where conventional surveying equipment was difficult to use. LRTK demonstrates its power in initial surveys and recovery support thanks to its portability and technical features.

Introduction challenges: Right after a disaster, it is difficult to bring in large surveying equipment. In disaster areas the ground is often unstable and debris is scattered, leaving little time to set up a tripod and conduct leisurely surveys. In addition, if power outages or base station damage have knocked out communications infrastructure, network connections for receiving GNSS correction data are unavailable. As a result, accurate positioning is often abandoned in favor of rough visual surveys, which can lead to large errors and hamper detailed later surveys or recovery planning. Because surveys at disaster sites are dangerous, survey time must be kept as short as possible.

Changes after LRTK introduction: The small, portable LRTK proves invaluable at disaster sites. Investigators can carry a pocket-sized device and quickly acquire coordinates and surrounding point clouds while walking the impacted area. For example, immediately after a large earthquake, LRTK enables a single person to quickly record the site. In fact, during the 2023 Noto Peninsula offshore earthquake, LRTK was used for field surveys under conditions outside communication coverage. Even without mobile networks, LRTK can receive correction signals from Japan’s Quasi-Zenith Satellite System “Michibiki,” which provides centimeter-level augmentation service (CLAS), so high-precision positioning is possible without the Internet. This allowed disaster areas to be recorded and preserved with accurate position information, enabling the creation of detailed damage maps afterward.

Point-cloud scans and photo records from LRTK also help with three-dimensional understanding of disaster sites. Tasks such as converting the topography of a collapsed slope into 3D data or preserving cracked structures with coordinate-tagged photos—work that previously required specialized contractors—can be completed during initial response. If the data are shared later via the cloud, headquarters in remote locations can immediately confirm and analyze the situation. This is a significant advantage in disaster response, where situations change by the hour.

Moreover, using LRTK’s navigation function makes it easy to return to exactly the same point for follow-up surveys. In recovery work after a disaster, it is necessary to visit the same locations multiple times to record progress. By simply selecting coordinates saved in the LRTK app, investigators are guided to that point, so even when staff change, there is no risk of losing survey points. As a result, disaster response surveying becomes more efficient while also improving the safety of surveyors.

Thus, LRTK exerts great power even in emergency surveying and recording tasks. Its small size allows it to be taken to the field quickly, and its reliability—being able to survey even when infrastructure is down—has received high praise from administrative agencies, fire departments, police, and other organizations involved in disaster response. Beyond the role of a surveying instrument, LRTK is increasingly recognized as a tool that helps protect lives and infrastructure.

Toward a New Era of Simple Surveying Realized by LRTK

As we have seen, the effects of introducing LRTK are immense across various sites. The real-world examples from bridge construction, land surveying, and disaster response make it clear that LRTK has the potential to transform surveying work itself. With high-precision position information accessible to anyone, the fixed notion that “surveying is only for specialized technicians” is beginning to collapse. Field workers themselves can quickly perform surveys when needed, then instantly share and use that data—truly heralding a new era of simple surveying.

With LRTK, situations that once required waiting for a surveying team can be measured swiftly on the spot. For example, construction managers can scan a site with their own smartphones to calculate quantities, municipal staff can perform solo infrastructure inspections, and the concept of “one device per person” becomes a reality. This dramatically boosts on-site productivity and helps address industry challenges such as labor shortages and dependence on skilled personnel.

The convenience offered by LRTK not only improves efficiency but also contributes to on-site safety management and data quality. Real-time access to accurate data speeds decision-making and reduces mistakes. Digital data management that does not rely on paper field books or notes will become a valuable asset for future infrastructure maintenance. These changes represent an impactful reform in how work is done on site.

Finally, to civil engineers and surveyors reading this article, please consider LRTK for your site needs. As the surprising examples shown demonstrate, the benefits of introducing the LRTK surveying instrument can be experienced once you try it. The dramatic changes brought by cutting-edge technology are not limited to special projects. In daily operations, LRTK enables safe and efficient simple surveying and can be a major step forward in site improvement. Experience the new era of surveying style that LRTK brings to the field and see its convenience and impact for yourself.