Article 14 maps (drawings equivalent to maps) are high‑precision maps under Article 14, Paragraph 1 of the Real Estate Registration Act, and they are important documents that accurately show land boundaries and shapes. Compared with conventional cadastral maps, they are characterized by higher accuracy and by the ability to restore boundary positions from the map within a certain error—on‑site restorability. In boundary determination surveys and cadastral investigations, these Article 14 maps are valued as evidence of land boundaries and are indispensable for preventing boundary disputes and enabling smooth real estate transactions.

However, their creation and maintenance require advanced surveying skills and considerable effort. In boundary determination surveys, boundaries are confirmed and established with the participation of neighboring landowners, and accurate survey results are compiled into records and drawings. Because even small errors are unacceptable, traditionally time‑consuming tasks such as precision distance measurement with total stations, leveling, and rigorous positioning from known reference points have been necessary. Recording site conditions is also important; photographing boundary markers and landmarks and preparing meeting confirmation documents are cumbersome tasks for preserving evidence. Creating drawings in CAD based on survey results and preparing them for real estate registration also requires specialized knowledge and experience.

Although creating and managing such high‑accuracy, highly evidential Article 14 maps demands great effort, the recently introduced LRTK (a smartphone surveying system that utilizes high‑precision GNSS) can dramatically streamline these tasks while further strengthening evidential value. Below, we explain the main improvements LRTK brings to the creation and use of Article 14 maps.

• Centimeter-class (inch-class) high‑precision positioning using GNSS: Satellite positioning allows acquisition of global geodetic coordinates without known points, making it possible to determine boundary point positions in centimeters (inches).

• 3D point cloud capture and boundary point recording via smartphone operation, with AR navigation guidance: By scanning the surroundings with a smartphone equipped with a dedicated receiver, boundary markers and current site conditions can be recorded as 3D point cloud data. In addition, an AR navigation feature on the smartphone guides users to measured boundary points, allowing intuitive stake‑driving and searching for existing boundary markers.

• Cloud sharing of point clouds and photos: Captured point clouds and site photos can be uploaded to the cloud immediately and shared among stakeholders. Because all interested parties can view the same data, this greatly aids consensus building on boundaries and evidence preservation.

• Streamlined deliverable drawing creation and drawing management: Measurement data can be viewed and edited in the cloud and easily exported to CAD drawings and coordinate lists. Handling digital data directly reduces the effort required to create and manage registration drawings.

Now, let’s look in detail at the specific benefits LRTK brings to Article 14 map surveying for each of these points.

Accuracy requirements and challenges for creating Article 14 maps

Article 14 maps are official maps kept at the Legal Affairs Bureau, and their accuracy is extremely important. To qualify as an Article 14 map, the boundaries with neighboring land must be precisely surveyed so that area, distance, and angles can be reproduced on site. Traditionally, surveyors and registered land and building surveyors have used advanced instruments and know‑how to meet this standard. Specifically, they secure a starting point based on national coordinates through control point surveying, determine coordinates of each boundary point with a total station, and measure elevations with a level when necessary. When confirming each boundary marker, the positions are compared and agreed upon with the parties present, and a boundary confirmation document and photographs are prepared to record the process. These tasks require not only precision but also face practical difficulties such as weather, terrain constraints, and scheduling with stakeholders.

Moreover, preparing the reports and map drafting after boundary determination is also burdensome. Based on values and sketches collected on site, drawings must be produced in CAD and reformatted into the Article 14 map format for submission to the Legal Affairs Bureau. Tasks such as ensuring consistency of point and line dimensions, checking scale and orientation, are prone to human error when done manually. Also, when drawings are managed on paper or as PDFs, it can be difficult to determine which survey data is the most recent when updates are needed.

There are also challenges regarding evidential value. In the event of a boundary dispute, the created drawings and reports are relied upon, but flat drawings and textual records alone may not fully convey on‑site conditions. Especially when only old documents are available, it can be difficult to completely dispel questions such as “Did the boundary really exist at the position shown on that drawing?” and additional on‑site verification may be required. Even if a high‑precision Article 14 map has been prepared, if there is little on‑site situational evidence from that time, disputes may still arise later.

To address these issues of accuracy assurance, work efficiency, and evidence preservation, the latest surveying technology LRTK offers a promising solution. The next chapter covers LRTK’s specific functions and their effects on Article 14 map work.

Improving boundary survey accuracy with centimeter‑level positioning by GNSS

The core technology of LRTK is GNSS (Global Navigation Satellite System)‑based real‑time positioning (RTK positioning). By attaching a dedicated compact, high‑performance GNSS receiver to a smartphone and using satellite signals with correction data, centimeter‑level positioning accuracy—which previously required stationary high‑end equipment—can be easily achieved in the field. This enables the precise surveying required for Article 14 map creation with fewer steps.

For example, traditionally, if there were no known secondary control points or electronic reference points nearby, it was necessary to find nearby control points in advance and establish a survey network. With LRTK, you can obtain your current global geodetic coordinates (the World Geodetic System) in just a few dozen seconds. Errors are around horizontal ±2 cm (±0.8 in) (and sometimes less), and vertical errors are about ±4 cm (±1.6 in), comparable to the accuracy of control‑point surveys. Thus, even in mountainous areas where control points are distant, using LRTK means control‑point surveying can be completed immediately, allowing you to proceed to coordinate measurement of boundary points. Of course, it is also possible to align with the Geospatial Information Authority of Japan’s electronic reference point network or existing local coordinate systems; coordinate transformation functions using multiple known points let you quickly match existing drawings’ local coordinate systems.

GNSS positioning shows its true value outdoors with few obstructions. Traditionally, in areas surrounded by trees or buildings it was difficult to set up equipment and secure lines of sight, but with LRTK you can hold the handheld smartphone high or attach it to a pole and extend it overhead to better receive satellites and achieve stable positioning. Furthermore, because it supports Japan’s QZSS (“Michibiki”) augmentation signals (CLAS), precise positioning can continue using only satellites even in forests with no mobile reception. By leveraging GNSS in these ways, high‑precision position information can be acquired quickly across wide survey areas, strengthening the foundation for ensuring required accuracy in boundary determination.

Easy 3D point cloud measurement and boundary recording with a smartphone, and AR guidance for stake driving

Another major innovation of LRTK is the simplification of on‑site measurement tasks via smartphone. Traditionally, recording features and terrain around boundaries required combining multiple methods such as plane table surveying, photography, and sketching. With LRTK, you can obtain the surrounding situation as 3D point cloud data simply by holding and moving a smartphone on site. Using the phone’s built‑in LiDAR sensor and high‑resolution camera, surfaces, structures, and boundary markers can be recorded as tens of millions of points in a point cloud. By walking slowly as if recording a video, ground undulations and nearby structures around boundaries are comprehensively digitized. All captured point clouds are tagged with the aforementioned GNSS absolute coordinates, making it easy to overlay them later with topographic maps or aerial photos in the office or integrate them with other survey data.

Recording the boundary points themselves is also simple. For example, when you find a boundary marker on the ground (plate, stake, etc.), you can tap that point on the smartphone screen to mark it and save it as a high‑precision coordinate value. Previously, placing a prism at the center of a stake and measuring with a TS required considerable effort, but with LRTK you can intuitively specify points on the map or camera view on the phone screen, allowing even less experienced assistants to accurately record boundary points. Also, if you take a positioned photo (a panorama photo with geolocation) with the phone’s camera at the same time as recording, you can later review the marker’s appearance and surrounding environment in detail. Photos are automatically tagged with capture location coordinates and orientation, so it’s immediately clear on the map from which direction a boundary marker was photographed.

A particularly notable feature is AR (augmented reality) coordinate navigation. This function guides you in real time on the smartphone screen toward preconfigured boundary or target points. For example, when only past coordinate values are available for boundary restoration surveys, entering those coordinates into LRTK allows you to simply hold up the smartphone and see arrows or markers indicating the estimated position of buried boundary markers or where to drive stakes. This visually shows the stake positions or search locations, enabling efficient stake driving and boundary marker searches without long, uncertain ground searches or fine adjustments in layout positioning. Tasks that previously required surveying calculations, tape measures, or TS position setting are replaced by intuitive AR guidance.

LRTK also reduces on‑site labor by making it easier to complete surveying tasks individually. Historically, stake‑driving and layout work required two people—a device operator and an assistant—but with AR guidance a single person can accurately identify points and proceed efficiently even when staffing is limited.

In these ways, LRTK enables measurement, recording, and guidance to be completed with a single smartphone, dramatically improving on‑site efficiency and accuracy. At boundary confirmation meetings, recording point clouds and photos in real time and showing AR visualizations to stakeholders can help achieve consensus on the spot.

Strong support for consensus building and evidence preservation through cloud sharing of point clouds and photo data

Data captured with LRTK can be uploaded to the cloud directly from the smartphone on site. With one tap to synchronize during surveying, data can be shared in real time with colleagues in the office or stakeholders who will join later. In the cloud, uploaded positioning points, point clouds, and photos can be viewed freely in 2D map screens or 3D viewers. No dedicated software installation is required—anyone with shared login credentials can view the same screen via a web browser—so data can be shared regardless of software availability.

Cloud sharing smooths the process of reaching consensus on boundaries. For example, landowners who could not attend a site meeting can later be shown the boundary locations via the cloud’s point cloud data or be shown photos of marker surroundings. Because 3D point clouds capture terrain elevations and the relative positions of fences and structures on boundary lines, current conditions that are hard to convey in a flat drawing are intuitively understood. When stakeholders share the same visual information, they can agree on fine details such as “there was a step here” or “this is the spacing between the fence and the boundary,” helping to prevent misunderstandings and distrust before they arise.

Data stored in the cloud also becomes a valuable resource for future evidence preservation. Even if site conditions change over the years, reviewing the point clouds and photos captured at the time allows virtual reconstruction of the terrain and marker conditions at the time of boundary determination. The ability to preserve “three‑dimensional site evidence” that paper drawings and textual records cannot fully retain is highly effective for resolving or verifying boundary disputes when needed. Furthermore, organizing data by project in the cloud enables ongoing sharing of survey history among stakeholders and promotes DX (digital transformation) in boundary management.

When sharing, access rights and password settings can be applied so data for sensitive survey projects can be safely disclosed within the required scope. With these cloud sharing features, LRTK realizes centralized information from the field to the office and to clients and neighbors, strongly supporting transparent consensus building and evidence preservation.

Directly creating drawings from digital data: streamlining deliverables and improving accuracy

The task of compiling final deliverables from on‑site data can also be greatly streamlined by introducing LRTK. Traditionally, survey field books and point records were used to create CAD drawings, followed by repeated checks and corrections to produce the deliverable “map (Article 14 map).” This process was vulnerable to manual input errors and dimension shifts during drafting. With LRTK, coordinate data and point clouds can be used directly for drawing, reducing intermediate manual work and lowering the risk of mistakes.

On the LRTK cloud platform, you can measure required dimensions while reviewing surveyed point clouds and point coordinates, and perform analyses such as generating cross‑sections. For example, you can extract a cross‑section along a site edge from the acquired point cloud to measure elevation differences, or directly measure distances along boundary lines in the 3D viewer with a single click. Exporting these values allows them to be reflected directly in reports or drawing annotations. LRTK also supports exporting survey results as CAD data (DWG/DXF, etc.) and coordinate lists (CSV), facilitating smooth import into existing design software and registration application systems. If you complete the world‑geodetic ⇔ local coordinate transformation in the cloud, the exported data will already match the required coordinate system.

Moreover, digitally centralized drawing data is powerful for post‑delivery management and later use. Instead of finishing with paper drawings or PDFs, saving the underlying point cloud and coordinate data linked in a project folder means that years later you can recall and reanalyze the original data when rechecking boundaries. Adding new survey results and comparing them allows you to understand long‑term changes or alterations due to renovations. In this way, the digital linkage from LRTK data collection to drawing generation produces survey deliverables that remain valuable after delivery, reducing effort in drawing management and improving service quality.

LRTK applicable across a wide range of tasks, from routine quick surveys to boundary restoration

So far we have discussed LRTK use in contexts related to Article 14 maps, but its advantages are not limited to official map creation. LRTK is also powerful for everyday small surveys and boundary confirmation tasks.

For example, if you need to know site dimensions for building layout planning or land use decisions through a simple survey, you can quickly obtain major dimensions with LRTK site positioning and gain sufficiently accurate data in a short time. For boundary restoration where existing markers are buried or damaged, AR navigation can locate positions rapidly based on previously recorded coordinates and allow quick re‑staking. As a precheck before requesting a boundary meeting with authorities, capturing current point clouds with LRTK helps you understand conditions around the boundary. For construction prechecks involving heavy machinery, you can immediately estimate earthwork volumes or check slopes from point clouds and feed that information into construction planning. In disaster response, you can scan and share locations of road breaks or collapsed terrain immediately, supporting rapid response planning.

Furthermore, in areas where Article 14 maps are not yet prepared, regularly accumulating accurate coordinate data with LRTK will provide valuable reference materials for future cadastral surveys and map improvement. The intuitive smartphone app interface is also well suited to training newcomers, contributing to standardizing surveying methods independent of veteran experience.

Thus, LRTK is a flexible tool usable across a wide range of scenarios—from tasks that prioritize absolute accuracy such as boundary determination surveys and cadastral investigations to routine field surveys, inspections, and checks. Because it enables easy surveying without specialized equipment, not only surveyors and registered land and building surveyors but also municipal staff and construction contractors are increasingly able to perform surveys themselves. As field DX progresses, adopting smart surveying tools like LRTK directly improves both operational efficiency and the reliability of deliverables. As a next‑generation partner that will raise the quality and productivity of all surveying tasks, why not consider using LRTK to both strengthen the evidential value of Article 14 maps and enhance overall surveying outcomes?