Table of contents

• What is a land registry survey? Its importance and current status

• Challenges of traditional land registry surveys

• Efficiency improvements in land registry surveys through new technologies

• What is the smartphone RTK system "LRTK"?

• Main benefits of introducing LRTK

• Survey tasks that one person can complete: LRTK use cases

• The future of land registry surveys and the role of LRTK

• FAQ

What is a land registry survey? Its importance and current status

A land registry survey is an investigation to accurately measure and record the boundaries and areas of individual parcels of land. This important work forms the basis for real estate registration and land transactions, and has been conducted nationwide primarily by the national and local governments. By clearly defining land boundaries, the aim is to prevent boundary disputes between owners and support the safe and secure use of land assets.

In Japan, land registry surveys began in 1951 (Showa 26) and have been underway for over 70 years. However, progress has not been sufficient. According to statistics from the Ministry of Land, Infrastructure, Transport and Tourism, as of 2024 the nationwide completion rate of land registry surveys remains at only about 53%. Delays are particularly noticeable in urban and mountainous areas, leaving many regions with unclear boundaries. Given this situation, there is a strong demand for improving the efficiency of land registry surveys and completing them sooner.

The reason land registry surveys are so important is that accurate land information is the foundation of society. For example, clear boundaries and rights relationships are essential for rapid post-disaster reconstruction and infrastructure development. Clear boundaries also help prevent disputes during inheritance or sale. Thus, land registry surveys are a significant national project that supports citizens’ lives and economic activity. However, because most of the work has historically relied on manual field operations, surveys have inevitably required considerable time and manpower.

Challenges of traditional land registry surveys

In traditional land registry and boundary surveying, many inefficient processes existed. Even professional survey companies and licensed surveyors had to invest considerable effort and time when using conventional methods. Here are the main challenges faced during traditional land registry surveys.

1. Survey work requiring multiple people: When measuring boundary points, it has been common to use optical transits or total stations (tripod-mounted surveying instruments). Precise measurement with such equipment requires at least two people on site: an operator for the instrument and an assistant holding the target prism or staff. One person looks through the instrument while the other holds a marker at a distant point, so staffing is a prerequisite. As labor shortages have intensified, the requirement of this “two-person team” has become a significant burden for the surveying industry.

2. Time-consuming equipment setup and movement: High-precision surveys require stable equipment setup and frequent repositioning. For example, obtaining the coordinates of a single boundary point involves erecting a tripod, setting up the instrument, measuring, moving to the next point, and repeating the tripod setup. Terrain and surrounding obstacles can make finding suitable locations for equipment installation difficult. As a result, the number of points that can be measured in a single day tends to be limited, and it is not uncommon for surveys to take an entire day even on a small plot.

3. Effort for data recording and drafting: With traditional methods, field survey data are often recorded by hand in field notebooks or memos and then taken back to the office for transcription and drafting—resulting in double work. In current-condition surveys that measure many points, repeatedly transcribing point numbers and values to paper can lead to human error, omissions, or mistakes. If a missed measurement is discovered later, the team must return to the field, further reducing efficiency. Especially in forests or complex urban areas where field surveys are burdensome, it is important to obtain accurate data in a single outing.

4. Complicated on-site meetings and consultations with stakeholders: Land registry surveys sometimes require on-site boundary confirmation with landowners and municipal officials (for example, public-private boundary agreements). With traditional surveying equipment, it is difficult to intuitively visualize “where the boundary line runs” on the spot. Officials must compare paper cadastral maps and old survey maps while searching for boundary markers, which takes time for all stakeholders to share the positional relationship. In some cases, boundary markers cannot be found, leading to additional surveys or re-negotiations. The fact that on-site consensus building can be time-consuming is another challenge for land registry surveys.

As described above, conventional land registry surveys, while able to secure high accuracy, inevitably consume time and manpower. Survey companies often had to prioritize accuracy over efficiency, making it difficult to reconcile “speed” and “high precision.” However, recent advances in digital technology are beginning to change this situation significantly.

Efficiency improvements in land registry surveys through new technologies

In recent years, the surveying industry has rapidly adopted ICT technologies, ushering in a transformation in how land registry surveys are conducted. Initiatives promoted by the government such as “i-Construction” have led to the introduction of new technologies on-site, including drone aerial surveys, 3D laser scanners, and GNSS-based surveying methods. These technologies have the potential to dramatically increase efficiency for tasks ranging from wide-area terrain surveys to pinpoint boundary surveys.

For example, drones can quickly capture a wide area from above, and laser scanners can obtain detailed point cloud data even in complex terrain. However, drone flights require permits and specialized knowledge, and laser scanners are very expensive, so they are not yet readily available to everyone.

In contrast, GNSS (Global Navigation Satellite System)-based high-precision surveying has been attracting attention. GNSS positioning using signals from satellites used to have errors of several meters. But with the advent of RTK (Real-Time Kinematic), which uses correction information from reference stations, positioning errors can be reduced to several centimeters. RTK-GNSS devices have existed for some time but were large and expensive, usable only by specialists. Recently, however, centimeter-level GNSS positioning is becoming possible on smartphones.

Some may be surprised by RTK positioning on smartphones. Advances in smartphone technology and miniature precision devices have enabled RTK-GNSS, once dominated by stationary units, to shrink to mobile-phone size. This greatly reduces the burden of carrying equipment in the field and creates an environment where one can measure accurate positions “anytime, anywhere.” Among these, a notable example is the high-precision smartphone positioning system called “LRTK.”

What is the smartphone RTK system "LRTK"?

LRTK (L-R-T-K) is a surveying system centered on a compact RTK-GNSS receiver used in combination with a smartphone. By attaching a pocket-sized device to the back of a smartphone and launching a dedicated app, the smartphone instantly becomes a high-precision surveying instrument. The device contains a high-performance GNSS antenna and positioning engine, and it communicates with the smartphone via Bluetooth to perform real-time position correction.

LRTK enables centimeter-level positioning accuracy comparable to conventional large equipment. In areas with internet connectivity, it can receive correction data via the Ntrip protocol from Geospatial Information Authority of Japan electronic reference points (GNSS reference stations) or private reference station services to improve measurement accuracy. For sites outside communication coverage, some models can directly receive the CLAS signal from Japan’s quasi-zenith satellite system “Michibiki,” enabling RTK positioning using satellite correction information alone even where mobile signals are unavailable. This makes stable, high-precision positioning possible anywhere in Japan.

The devices themselves are very lightweight and compact, weighing about 100–200 g and with a thickness of approximately 1 cm (0.4 in). They are truly as easy to carry as a smartphone case and can be pulled out and used whenever needed. Some models also feature tilt compensation, so when mounted on a pole, internal sensors automatically correct for slight pole tilt and calculate accurate coordinates. This allows maintenance of accuracy even when the pole must be tilted to avoid obstacles.

LRTK is an innovative tool designed to enable anyone to easily perform high-precision surveying without specialized knowledge or bulky equipment. So what concrete benefits does introducing LRTK bring to land registry survey sites? The next section outlines those effects.

Main benefits of introducing LRTK

Introducing LRTK, which combines a smartphone and a compact GNSS receiver, can dramatically improve the efficiency of land registry survey work. Here are some of the main benefits of adopting LRTK.

• Highly mobile and speedy: You can start surveying directly with the smartphone taken from your pocket; simply raise the device to the point you want to measure and tap a button to instantly obtain coordinates. Because cumbersome equipment setup is unnecessary, you can measure whenever the need arises. Tasks that used to take half a day to check boundary points can now be completed in just a few minutes to tens of minutes for several points.

• Survey work can be completed by one person: With smartphone RTK, no assistant is required and a single person can conduct surveys. By mounting the smartphone setup on a dedicated telescopic pole, you can easily measure from boundary stakes at your feet to high locations beyond your height, like using a selfie stick. Since you no longer need someone else to hold a prism or staff, you can work at your own pace and reduce scheduling hassles.

• Professional-grade high accuracy: Despite the small device, positioning accuracy is no joke. RTK corrections keep errors within a few centimeters, producing results comparable to conventional large instruments. Using averaging functions to observe the same point multiple times and average the data can even improve accuracy to the millimeter level. It can therefore be relied upon in situations that demand high precision, such as boundary determination.

• AR function visualizes boundaries: LRTK-compatible smartphone apps include AR (augmented reality) features. Measured points and preloaded boundary line data can be overlaid on the smartphone camera view, visualizing boundary lines on-site as if drawing lines on the ground. Old boundary markers hidden by vegetation can be quickly located by following AR cues. During on-site meetings or consultations, showing the screen to all stakeholders makes it easy to share “where the land runs from and to,” which smooths consensus building.

• Instant on-site distance and area calculation: The smartphone app can automatically calculate distances between measured points and the enclosed area on the spot. For example, you can measure the spacing between distant boundary stakes on-site and instantly compare those values with those recorded on cadastral maps. This removes the need for a separate calculator and allows quick verification during meetings.

• Cloud integration for data management: It is possible to upload coordinate data to the cloud in real time as measurements are taken. Field-collected information can be shared and checked without returning to the office, eliminating the need to transcribe field notebooks and preventing transcription errors. Automatic digital storage of survey data improves record reliability and streamlines later drafting of drawings and report preparation.

• Low-cost and easy to adopt: Smartphone surveying devices like LRTK are more affordable than traditional dedicated surveying equipment, making it feasible to adopt them with relatively small investment. Equipping each staff member with a unit is realistic, enabling organizations to ensure everyone carries a high-precision positioning tool. This leads to higher overall productivity and represents a cost-effective solution.

As described above, using LRTK allows land registry survey sites to achieve “efficiency improvements without sacrificing accuracy.” Tasks that once required significant time and manpower can be greatly streamlined, freeing up time for other important duties. Also, being able to immediately share and utilize survey results improves work quality and facilitates explanations to clients and stakeholders.

Survey tasks that one person can complete: LRTK use cases

The power of LRTK is evident from real-world field cases. For example, at one survey site, a single technician carried an LRTK attached to a smartphone and combined it with the phone’s built-in LiDAR to quickly collect point cloud data of the ground surface. A terrain survey that would normally take multiple people more than half a day on sloped land was completed with a scan of only about 5 minutes on a development site of approximately 50 m (164.0 ft) square. The huge volume of 3D data collected allowed free generation of cross-sections and contour lines, making later drafting much more efficient. That a single person could obtain high-precision terrain information just by walking is revolutionary.

In another case, by introducing LRTK for boundary determination, tasks that previously required two or more people—measuring boundary points and photographic documentation—could be performed by one person. Once a boundary stake was found, coordinates were measured on-site and photos taken on the smartphone were automatically linked to the positioning data, enabling detailed recording of site conditions. When preparing reports later in the office, staff only needed to refer to the cloud-stored data, avoiding re-entry from paper notes. The person in charge could immediately move on to the next job, enabling continuous workflow.

These successful field cases show that the one-person survey style enabled by LRTK is gradually spreading. The conventional notion that “survey work must be done by a team” is being challenged by new technology, and experts are beginning to recognize the new possibility that “a single person can accomplish this much.” Survey companies that tested LRTK have reported being amazed, saying it “overturns conventional wisdom on efficiency,” and the technology is attracting attention within the industry.

The future of land registry surveys and the role of LRTK

Given the reality that about half the country’s land still lacks completed land registry surveys, it is clear that future surveys will need to be faster and more efficient than before. The key to achieving this will be the adoption of advanced technologies like those discussed here. Smartphone RTK systems typified by LRTK are expected to become increasingly prominent as powerful tools that promote the digitalization and labor-saving of surveying work.

In fact, the LRTK series was launched as a solution to improve productivity through high-precision positioning in construction, civil engineering, and surveying. It is compatible with the Ministry of Land, Infrastructure, Transport and Tourism’s “i-Construction” initiative and helps accelerate DX (digital transformation) across the industry. By actively adopting the latest technologies, surveying companies and technicians engaged in land registry surveys will be able to provide faster and more accurate services than ever before.

Of course, even the best tools require a certain level of knowledge and experience to use effectively. However, LRTK’s intuitive smartphone app interface makes it relatively easy for technicians to become proficient in a short time. With a low barrier to adoption, the system can be smoothly integrated into organizations. In the future, smartphone surveying may become commonplace, and the appearance of land registry survey sites could change dramatically.

Finally, improving the efficiency of land registry surveys benefits not only field workers but society as a whole. Faster and more accurate surveys accelerate boundary determinations, reduce the risk of disputes, and smooth real estate transactions. They also support rapid recovery and infrastructure planning in times of disaster. Utilizing innovative tools like LRTK makes it possible to achieve land registry surveys that are “fast, inexpensive, and reliable,” thereby contributing to more effective land use and improved safety nationwide.

Actively embracing the benefits of the latest technologies and balancing efficiency with high accuracy is what future land registry surveys require. As an ally in that effort, LRTK can be a powerful help. If you are interested in improving the efficiency of land registry surveys or surveying work, consider this smartphone RTK system. With LRTK—capable of achieving efficiency that even survey companies find astonishing—you can carry out future land registry surveys quickly.

FAQ

Q: What does a land registry survey do? A: A land registry survey verifies boundary lines for each parcel of land and accurately records area and rights relationships. Municipalities lead the process, confirming boundaries through on-site inspections with landowners. The results are reflected in cadastral maps and registers, aiding future land transactions and preventing boundary disputes.

Q: Can smartphone-based surveying really achieve sufficient accuracy? A: Yes. Using the latest smartphone surveying system LRTK, RTK-GNSS technology can increase positioning accuracy to within a few centimeters. It achieves accuracy comparable to conventional professional equipment and is suitable for tasks such as boundary surveying. With appropriate correction data and averaging functions, accuracy can even be improved to the millimeter level.

Q: Are data measured with LRTK accepted as official survey results? A: GNSS-based surveying has already been adopted as a method for public surveys, and it can be used for land registry surveys if conditions are met. The Geospatial Information Authority of Japan’s guidelines also describe methods using network RTK surveying. LRTK itself is a simplified surveying system, but the positioning data it provides can match the accuracy of existing surveying methods, so results can be submitted if proper procedures are followed. However, formal submission requires work to be conducted under the supervision of qualified professionals such as surveyors or licensed land and house investigators.

Q: Can LRTK be used in remote mountains with no radio signal? A: Yes. LRTK includes measures for use outside communication coverage. In areas without mobile network service, LRTK can maintain positioning accuracy by receiving CLAS augmentation signals from “Michibiki” (the quasi-zenith satellite). Therefore, high-precision positioning is possible in mountainous areas, remote islands, and other sites beyond base station coverage with LRTK-compatible models.

Q: Is the cost and operation of introducing LRTK difficult? A: Compared with conventional high-precision surveying equipment, LRTK is characterized by low-cost, easy adoption. Its simple configuration of a smartphone and a small receiver keeps initial expenses down, and no special equipment installation work is required. The dedicated app is designed for intuitive operation, and those with surveying experience can master it in a short time. If there are concerns about operation, training and support systems are available.

Q: Where can I find more information about LRTK? A: For more details and implementation examples of LRTK, consult the manufacturer’s official website and materials. Information on the latest features, user case studies, pricing, and adoption plans is provided. Interested readers should also check the [LRTK official site](https://www.lrtk.lefixea.com/).