What is a 14-Article map: challenges faced in the field

The map kept at the Legal Affairs Bureau under Article 14 of the Real Estate Registration Act is commonly called a "14-Article map." This is an official map that, based on accurate surveying, precisely shows parcel boundaries, lot numbers, and shapes. Each boundary point’s position is represented by coordinates in the plane rectangular coordinate system and can be restored with a certain level of accuracy. For land and building surveyors, creating and updating 14-Article maps is an important task, but there are multiple challenges on site.

First, conducting as‑is surveys and investigating boundary points is time-consuming. Traditionally, confirming boundary markers and surveying the property required specialized equipment such as transits or total stations, and often multiple people were needed. In forests, fields, or other locations with poor lines of sight, securing sightlines between survey points is difficult, and in areas with significant elevation differences, leveling measurements are also required. Using tapes or distance meters carries a high risk of human error, and mistakes can lead to boundary disputes. Moreover, the task of converting numbers recorded in paper field notebooks into drawings back at the office is tedious and there is a risk of accuracy degradation due to data transcription errors.

Next, time and cost are also major issues. The coverage rate of 14-Article maps is still only around 60%, and many unprepared areas (map-confused regions) remain nationwide. To fill these gaps, improving the efficiency of field surveys is urgent, but traditional methods require substantial time and labor per site. In addition, high-precision GNSS survey instruments and premium surveying equipment are extremely expensive, and outsourcing to surveying companies can be a large financial burden. Small surveying offices often find it difficult to invest in equipment or secure specialist operators, and as a result they may be forced to rely on analog methods.

As described above, field surveying for 14-Article map creation faces many issues in terms of manpower, time, accuracy, and recordkeeping. Is there a new surveying style that can solve these problems? In recent years, surveying using smartphones combined with high-precision GNSS has emerged and is becoming an innovative solution to these challenges.

Problems and limitations of traditional as‑is and boundary point surveys

Looking back at sites for 14-Article map creation and boundary determination, several limitations of traditional techniques become apparent. Here we focus on conventional methods for as‑is surveys and boundary point surveys and organize their problems.

• Inefficient two-person operations: With total station surveying, a two-person team—an operator and a prism holder—is standard. One person sets up the instrument at a survey point while the other aligns the prism on a distant target, which requires coordination across large sites. This is inefficient amid labor shortages and can be physically difficult in narrow alleys or highly undulating terrain.

• Heavy equipment and complex operation: Precision instruments are essential for high-accuracy surveying, but they are heavy and difficult to carry. Setup, angle measurement, and distance measurement require specialized knowledge. It is challenging for trainees or assistants to handle the equipment alone, and time is needed to gain proficiency, making teams dependent on veterans. As a result, overall work pace can depend on whether experienced personnel are available.

• Barriers to GNSS surveying: GNSS-based surveying has gradually become more common, but traditional high-precision GNSS equipment is very expensive, and costs such as a base station and rover set and annual correction data fees are significant. Operational restrictions—such as requiring a first-class surveyor assistant to operate in public surveys—also mean GNSS is not universally accessible. Signal conditions can make positioning unstable, and achieving consistent accuracy required specialized know-how.

• Lack of digital integration of survey results: Maps and area survey diagrams submitted to the Legal Affairs Bureau have traditionally been prepared by hand drawing or CAD. Field measurements are often first written on paper and then reentered and redrawn at the office, resulting in much analog work. This process invites human errors such as misnumbering survey points or copying numbers incorrectly, which may require re-surveying or diagram corrections if discovered. Paper materials are also hard to share among stakeholders and explaining results to clients or neighboring landowners can be time-consuming.

From these problems, it is clear that "efficiency," "accuracy assurance," and "digitalization" are key to overcoming the limits of traditional surveying methods. There is a growing need for ways to perform as‑is and boundary confirmation work more quickly and reliably, and to utilize data seamlessly.

A new surveying style enabled by smartphones × high-precision GNSS

A technology attracting attention for dramatically improving this situation is the new surveying style that combines smartphones with high-precision GNSS. In particular, the system "LRTK," which enables smartphone use of real-time correction GNSS positioning (RTK), has emerged and is revolutionizing field surveying.

LRTK consists of a compact high-precision GNSS receiver that can be attached to a smartphone, a dedicated app, and a cloud service for storing and sharing data. Integrating with a smartphone creates a pocket-sized all-purpose surveying tool that allows anyone to easily achieve centimeter-level positioning (cm level accuracy (half-inch accuracy)). Conventional smartphone-built GPS had errors of about 5–10 m (16.4–32.8 ft) and could not be used for boundary surveys, but LRTK receives high-precision correction information from satellites in real time and achieves drastically improved accuracy—errors of approximately 1–2 cm horizontally (0.4–0.8 in) and within 3 cm vertically (1.2 in). Vertical positioning is also possible, so ground elevation and altitude can be determined without separate leveling, enabling three-dimensional surveying to be completed by a single person.

The greatest feature of this new surveying style is its intuitive operation and ease of use. On the smartphone screen, you can tap or designate the point you want to measure and obtain its coordinates in real time. The positioning antenna attaches to the back of the phone or to a monopod (pole), eliminating the need to carry heavy equipment, so one person can carry and survey. The device is battery-powered with no complicated wiring; turn it on, launch the app, and in a few minutes you can start surveying. No specialized operation is required; you essentially follow the app’s guidance, so even non-expert users can handle it. This allows younger staff to perform high-precision surveys, helping to alleviate labor shortages and achieve skill leveling.

But is smartphone surveying accuracy really reliable? Does it match traditional instruments? LRTK systems have already undergone accuracy verification at various sites. During satellite positioning, corrections from multiple reference points cancel error factors, yielding coordinates comparable to those from the Geospatial Information Authority of Japan’s electronic reference station network. In practice, measurements obtained by LRTK have been reported to differ from coordinates measured by first-class GNSS receivers by only a few millimeters, confirming accuracy comparable to professional surveying equipment. Furthermore, LRTK supports the centimeter-class correction service (CLAS) provided by Japan’s quasi-zenith satellite system "Michibiki," allowing correction information to be received via satellite even outside mobile phone coverage. This means that in mountain areas or radio‑shadowed farmland, high-precision surveying is possible so long as the sky is open.

Thus, the smartphone × high-precision GNSS approach embodies "anyone, anywhere, high accuracy." By dispelling concerns about accuracy while enabling surveys with far simpler equipment and operation than before, it is a technology that can be applied to 14-Article map creation sites. In the next section, we will look in detail at how smartphones and LRTK specifically change field operations.

LRTK use cases: coordinate guidance, positioned photos, GeoJSON integration, and cloud sharing

Introducing smartphones plus high-precision GNSS enables several new functions and services in the field. LRTK systems offer many features, but from the perspective of 14-Article map creation and boundary work, four particularly useful use cases are coordinate guidance, positioned photos, GeoJSON integration, and cloud sharing.

• Coordinate guidance (stake setting / boundary point navigation): This is a guidance function that helps you approach a predefined target coordinate on site. For example, if you input coordinates of boundary markers found in past surveys or planned stake positions from design, LRTK will display the difference between the current position and the target in real time. By following on-screen arrows and distance readouts, you can locate buried boundary stones or existing stakes hidden by vegetation with centimeter-level precision. In the past, workers would estimate stake positions with tapes and compasses and dig to find them, but the guidance function leads you efficiently and accurately to the point. It can also be applied to new stake setting (setting out positions), removing the need for multiple people to coordinate. A single field operator can place stakes reliably at the designated positions, greatly reducing time for setting boundary markers and confirming points.

• Positioned photos (high-precision coordinate-tagged photo records): It is important to photograph boundary markers and site conditions at surveying sites. With LRTK’s positioned photo feature, photos taken with a smartphone are automatically tagged with high-precision coordinates and the camera’s orientation. Plain photos can become ambiguous later about where they were taken from, but images saved with this function include the shooting point coordinates, allowing accurate location identification on a map afterward. For example, if you photograph a boundary stake, its coordinate will be embedded in the photo’s Exif data, so the photo itself serves as part of the survey deliverables. Sharing within the survey office or showing the image on a tablet during a boundary meeting with a neighboring landowner makes it easy to demonstrate "that stake is at this position," and attaching such photos to client reports provides highly reliable records. This also aids inspection tasks that compare time-series photos of the same point (monitoring changes over time), making visualization of fixed-point observations straightforward.

• GeoJSON integration (utilizing digital map data): Survey data acquired by LRTK—point clouds, coordinate points, tracks, and more—are stored in the cloud in various formats. These data can be exported in open geographic formats like GeoJSON, making it easy to import into other mapping software or CAD. GeoJSON is a generic format for point, line, and polygon data with coordinates and is highly compatible with GIS software and web maps. Therefore, you can import field-collected boundary point sets into municipal cadastral systems or load them into your drawing software to update 14-Article maps. Because LRTK digitizes data in the field, you can significantly reduce time spent on coordinate calculations and drafting that used to be done later. There is no coordinate shift or scale distortion when tracing paper maps, and distances and areas between survey points are computed accurately by the system. In short, the link from field to digital map becomes seamless, minimizing the boundary between surveying and drafting.

• Cloud sharing (real-time data synchronization and sharing): With LRTK, field-collected survey data can be synced to the cloud with one tap. Everything from coordinate lists of boundary points, survey tracks, and positioned photos to point cloud data acquired by iPhone-mounted LiDAR can be uploaded via the internet immediately. In the cloud, a dedicated web app allows data to be viewed on 2D maps or 3D views, so office personnel can check field survey results in real time. By issuing shared links, surveyors can easily let clients or collaborators view the data. Recipients do not need special software or high-performance PCs; anyone with a web browser can view the survey results via a sent URL. Even point cloud data are processed for display on the cloud side, so there is no need to install heavy software. This connects the survey site, the office, and all stakeholders directly via data. If a mistake or question arises on site, the team can immediately consult headquarters and, if re-measurement is required, perform additional measurements right away. Cloud sharing also speeds up deliverable submissions: survey results that used to be handed over on USB or paper can now be delivered the same day via the cloud, facilitating consensus building and faster registration filings.

As shown above, LRTK dramatically transforms guidance, recording, integration, and sharing. Other applications include projecting boundary lines or design lines onto the site via AR (augmented reality), and positioning in indoor or hard-to-access locations (target positioning functions)—unique capabilities of smartphone surveying. Even limited to functions directly related to land and building surveyor duties, the benefits are substantial; labor savings and enhanced data utilization that were unthinkable with traditional surveying styles are now attainable.

Streamlining from fieldwork to forms and reports in a single smart flow

Surveying with a smartphone and LRTK is valuable not only for measuring points but also for connecting the entire workflow—from planning to deliverable creation—digitally. Finally, let’s look at a general step-by-step flow of this new surveying workflow.

• Pre‑survey preparation (setting up planning data): Before going to the site, register known reference point coordinates, existing boundary point data, and design plan coordinate values into the LRTK cloud. Download them to the smartphone app as needed so they can be referenced on site. Instead of carrying paper documents, bring all necessary information as digital data on the phone.

• Field surveying (measuring and recording with a smartphone): Upon arrival, power on the high-precision GNSS receiver attached to the smartphone and begin positioning. First stand on a reference point and confirm its coordinate with LRTK to verify system accuracy. Then measure boundary points and other necessary as‑is points. If you need guidance, specify the target point in the app and the guidance starts. At the reached point, tap once to measure and save the coordinates; if you take photos, they are automatically linked. In this way, you digitally record points to be measured one after another. Measurement results are plotted on the map in real time, allowing you to confirm there are no omissions or missed points as you work.

• Immediate sharing (cloud sync and internal checking): After completing fieldwork, sync the data to the cloud from the app. Within seconds to tens of seconds via a network, all data are uploaded to the server and can be viewed from office PCs. Colleagues or supervisors can review the plotted points and photos on the cloud map in real time. If re-measurement is required, they can notify field staff by phone or message and have additional measurements taken immediately. Because the field and office are connected bidirectionally through the cloud, data quality can be ensured on the spot, reducing the need for later returns or additional site visits.

• Data utilization (drafting and analysis): Aggregated survey data in the cloud can be downloaded and imported into CAD or surveying calculation software as needed. For example, you can export coordinates in GeoJSON or CSV and overlay them with existing 14-Article map data to draw boundary lines—tasks that become smooth. The LRTK cloud also provides automatic distance and area calculation functions, allowing immediate analysis such as computing elevation differences or areas from acquired point cloud data. Land area calculations that used to be done with calculators or spreadsheets are now completed with a single button click, eliminating concerns about calculation errors. In addition, viewing 3D point clouds on the cloud and comparing them with design models enables checks of post-construction form or earthwork volume calculations without outsourcing to specialist firms. Beyond surveying, the ability to leverage acquired data from multiple angles is another appeal of digital surveying.

• Deliverable creation and reporting (generating and submitting maps and forms): Information managed digitally from the planning stage is directly useful for final deliverables. Boundary determination diagrams and area survey maps are automatically plotted in CAD based on accurate coordinate data from the cloud; you only need to add necessary annotations. Survey logs and reports can be prepared by referring to time-stamped survey logs and photos stored in the cloud, eliminating the need to review field notes. Some apps or clouds may even auto-fill report templates. The completed deliverables are used for client explanations and Legal Affairs Bureau registration filings. As digital data, submissions can be electronic; in some cases online submission or cloud sharing is sufficient. A fully digital flow from field to submission greatly reduces the handing over of paper maps or USBs and the duplicate work of manual data entry.

Through these steps, a cohesive smart surveying workflow using a smartphone and high-precision GNSS is completed. Establishing this flow dramatically shortens the time from fieldwork to report submission and minimizes opportunities for human error—truly a surveying workflow for the DX (digital transformation) era.

Conclusion: LRTK’s potential extends beyond 14-Article map tasks

Smartphone-completed high-precision surveying offers significant benefits for boundary determination and the creation and updating of 14-Article maps. We have seen how it addresses traditional challenges in terms of accuracy, efficiency, recordkeeping, safety, and sharing, fundamentally streamlining surveyors’ fieldwork. Now that centimeter-level GNSS surveying is within anyone’s reach, the style of boundary surveying is undoubtedly moving to a new stage.

Importantly, the simple surveying functions provided by LRTK can be applied beyond 14-Article map tasks. Examples include rapid site surveys for urban planning, boundary investigations of farmland and forests, parcel measurements for solar power facility sites, and post-disaster land recovery documentation—situations where portable high-precision surveying proves valuable. In construction, smartphone surveying is already being adopted for as‑built management and ICT-enabled construction efficiency, and it may well become the global standard in surveying. Keeping up with this trend and actively adopting new technologies in surveying practice can improve service quality across the industry and differentiate office management.

Of course, introducing new technology to the field can cause anxiety. The important thing is to take at least a small step forward. For example, trialing a smartphone surveying device and first checking its operability and accuracy on your own property or nearby land is recommended. Once you experience its ease of use and precision, practical ideas for field application will emerge. Startups that developed cutting-edge tools like LRTK now provide ample support information and case studies, so you can begin operating without long training periods. Turning the skepticism of "Can you really measure with a smartphone?" into confidence by testing it on site—that is the first step toward the surveying style of the future.

Surveying tasks related to boundary work, including the creation and updating of 14-Article maps, will undergo major changes. With the new companion of smartphones and high-precision GNSS, we hope land and building surveyors will be able to provide smarter and more accurate services. Take this opportunity to introduce next-generation surveying styles into the field. The future "normal" is just around the corner.