A Must-Read for Municipal Officials! Dramatically Streamline Cadastral Survey Work with Smartphone Surveying and Cloud Management

Table of Contents

• Traditional cadastral survey work and its challenges

• What is smartphone surveying? A new era of high-precision positioning

• Expanded data sharing and operational efficiency with cloud management

• Using smartphone surveying for boundary confirmation and cadastral map updates

• Using smartphone surveying for road ledger maintenance

• Smartphone surveying’s power in disaster response

• Summary of benefits from adopting smartphone surveying

• The expanded world of smartphone surveying with LRTK’s “Simple Survey” feature

• FAQ

Traditional cadastral survey work and its challenges

Cadastral surveys undertaken by municipalities are an important effort to accurately identify boundaries, areas, and owner information for each parcel of land in a region. Led by cities, towns, and villages under the National Land Survey Act, this work is sometimes described as creating the “family register” of land. However, despite being carried out since 1951—more than 70 years—cadastral surveys are reported to be completed for only about half the country, and many areas still lag in establishing boundary information.

One reason cadastral survey work progresses slowly is that conventional methods require a great deal of effort and time. Determining boundaries and creating or updating cadastral maps requires highly skilled surveyors and expensive surveying equipment, making it difficult for municipal staff to complete the work internally. In many cases, municipalities must commission external specialists such as licensed surveyors, which entails long lead times and high costs from commissioning to delivery. Internally, there are only a limited number of staff with surveying know-how, and issues such as labor shortages due to veteran technicians retiring and difficulty in transferring skills are serious. As a result, surveys cannot always be performed when needed, and boundary confirmations and map updates often stall. Moreover, fieldwork is frequently postponed due to bad weather or scheduling conflicts, causing overall delays.

For example, even a single site-based boundary meeting traditionally required landowners to gather while a professional surveyor used a total station to measure points and then later produced drawings based on that data. Such outsourced work is expensive and cannot be carried out frequently within tight budgets, so boundary finalization can take a long time. Similarly, measuring road widths and recording the positions of structures for road ledgers has often relied heavily on the experience of skilled staff or manpower-intensive methods, placing a significant burden on the responsible departments. In recent years, responses to increasing natural disasters have also taken time to capture conditions at affected sites. When a major disaster occurs, the initial response tends to be delayed because specialist survey teams must deploy equipment to measure damage areas, potentially hindering the formulation of restoration plans.

Thus, municipal cadastral survey operations face accumulated problems such as “reliance on external parties leading to time and cost,” “difficulty in accumulating skills internally,” and “difficulty in conducting rapid surveys in emergencies.” Is there a way to dramatically solve these problems? A promising key that has drawn attention in recent years is the use of a new surveying method using smartphones—“smartphone surveying”—together with cloud management that enables real-time sharing and management of survey data.

What is smartphone surveying? A new era of high-precision positioning

As the name implies, “smartphone surveying” is a new surveying method that uses a smartphone. Modern smartphones are equipped with advanced sensors such as GPS, cameras, accelerometers, and gyroscopes, and by combining them with a dedicated compact GNSS receiver (positioning terminal), astonishingly high-precision position measurement becomes possible. While conventional consumer GPS often produces errors of several meters, connecting an RTK (Real Time Kinematic)-capable receiver to a smartphone can reduce positioning errors to within a few centimeters (a few in). RTK is a positioning method that uses real-time correction information in addition to satellite positioning signals to achieve precise positioning; it is a revolutionary technology that enables centimeter-level accuracy—previously attainable only with specialized surveying equipment—on a smartphone.

Smartphone surveying is very simple to operate and, importantly, can be handled by anyone without specialized expertise. Preparation is as easy as attaching a compact GNSS receiver to the smartphone and launching a dedicated app. Your current position appears on the map on the screen, and when you arrive at a point you want to measure, you simply tap a button on the screen to record the precise coordinates of that point. If you want to measure multiple points, there is no need to set up a tripod or heavy equipment each time; you can move with the smartphone in hand and capture points continuously. For example, you can efficiently collect required data for a large park or a long road in a short time.

You may worry whether mobile network connectivity is required for positioning. Smartphone surveying has mechanisms to maintain high precision even in areas where mobile signals are weak, such as mountainous regions. Using a GNSS receiver compatible with Japan’s quasi-zenith satellite system “Michibiki,” which supports a centimeter-level positioning augmentation service (CLAS), ensures accuracy even in areas distant from base stations through satellite-based correction signals. In other words, as long as the receiver can see the satellites overhead, centimeter-level positioning is possible even outside mobile coverage, making smartphone surveying highly effective in forests, remote islands, and other field sites.

Depending on the smartphone and app capabilities, you can also use various convenient features that support field surveying. By combining the phone’s camera with AR (augmented reality) technology, you can overlay distances and angles on the camera view or connect multiple measured points on-site to create a simple plan drawing. For example, by measuring boundary markers in sequence you can draw the property boundary line in the field. Recently, functions that scan the surroundings with phone sensors and acquire three-dimensional point cloud data have appeared, useful for understanding the three-dimensional shape of terrain and structures and calculating volumes. In this way, smartphone surveying has the potential to transform cadastral survey work because it enables accurate surveying and drawing on the spot without special equipment or advanced skills.

Expanded data sharing and operational efficiency with cloud management

Equally important to smartphone surveying is the adoption of “cloud management.” Traditionally, survey data obtained in the field were stored as paper field books or drawings and later needed to be scanned or manually digitized. This created redundant work between field and office and increased the likelihood of errors. Introducing cloud management can significantly reduce these inefficiencies. Coordinate data and photos collected by the smartphone surveying app are automatically saved and synced to the cloud on the spot. Office PCs can check data immediately after field measurement, and colleagues can share information in real time, eliminating the time lag between field and office.

Survey data aggregated in the cloud can be smoothly integrated with a municipality’s GIS (geographic information system) or internal map management systems. For example, if boundary point coordinates or parcel shape data acquired by smartphone surveying are imported directly into the GIS, there is no need to re-scan paper drawings or manually enter coordinate values. As a result, digital updates of cadastral maps and land ledgers can be performed quickly, improving response to citizen inquiries and speeding up cross-checks with registry records. Automatic cloud backups also eliminate the risk of losing paper drawings or field notebooks, providing peace of mind in disasters. Moreover, constant sharing of the latest data among stakeholders helps facilitate cross-departmental collaboration and decision-making.

By combining cloud management, the process from data acquisition to utilization becomes seamless, dramatically improving the entire workflow of cadastral surveys. A digital workflow using smartphone surveying and cloud systems will be a driving force to strongly promote DX (digital transformation) of mapping administration in municipalities.

Using smartphone surveying for boundary confirmation and cadastral map updates

Smartphone surveying is extremely effective for the fundamental cadastral task of confirming land boundaries. Previously, when staff checked boundary markers (stakes) in the field, they typically relied on paper maps or cadastral maps carried on site and visual comparison to confirm positions. With smartphone surveying, you can measure and record the exact coordinates of boundary markers on the spot and immediately compare them with existing cadastral map data. Displaying the current cadastral map or registry map on the phone and overlaying the measured points makes it easy to detect any displacement of boundary lines or differences in area at a glance.

For example, during a boundary confirmation with landowner attendance, a staff member can measure boundary points with a smartphone so that all parties can confirm the results on the spot. Being able to show in real time that “the registry coordinate indicates this location, but the field survey shows a displacement of several centimeters (a few in)” facilitates evidence-based consensus building. It saves the effort of having to redraw maps and mail them later, and it becomes possible to prepare agreement documents during the meeting. In addition, the high-precision data obtained from smartphone surveying can serve as authoritative survey documentation and be used as supporting material for cadastral survey results and registry application documents.

Furthermore, boundary points and parcel shape data obtained by smartphone surveying can be reflected immediately in internal systems via the cloud mentioned earlier, greatly accelerating updates to cadastral maps and land ledgers. This method is far more accurate and less labor-intensive than scanning and correcting old paper registry maps, contributing to improved map reliability. As a result, corrections to cadastral maps and processes to identify legal parcel boundaries become more efficient, enabling faster responses to citizen inquiries and alignment checks with registry documents. Combining smartphone surveying with cloud management creates a seamless workflow from boundary confirmation to registry updates, advancing municipal cadastral management significantly.

Using smartphone surveying for road ledger maintenance

Smartphone surveying is also extremely useful for the maintenance and updating of the road ledger—records of road widths and attached facilities managed by road administration departments. Traditionally, measuring road widths required tape measures, and calculating curve radii often necessitated specialized equipment. Recording installation positions of road attachments such as guardrails, signs, and drainage facilities was done by writing on paper ledgers in the field and later transcribing into digital maps in the office, creating redundant work and increasing the chance of errors. Accurate drawing from such information could be difficult unless handled by experienced staff.

Introducing smartphone surveying enables a single person to perform these road condition measurements efficiently. The distance from one edge of the road to the other can be accurately calculated simply by tapping the start and end points on the smartphone screen. Curve radii and curve lengths can be automatically computed from the coordinates captured on site. All collected measurements and coordinates are digitally recorded in the app, so there is no need to return to the office to transcribe, reducing simple transcription errors. Additionally, photos of road facilities taken with the smartphone are saved with location tags, making it immediately clear “which point a photo of a sign corresponds to.” For example, when photographing a deteriorated guardrail, the image automatically records the latitude and longitude and the camera orientation. When reviewing photos later in the office, there is no risk of confusing locations.

Of course, data captured in the field sync to the cloud instantly, allowing office PCs to verify the latest field-collected information in real time. This immediate sharing enables efficient division of inspection tasks among multiple personnel when checking road assets. Such digitization greatly speeds up road ledger updates and contributes to the DX (digital transformation) of maintenance and management tasks. From daily road inspections to emergency inspections after disasters, data management combining smartphone surveying and the cloud enables flexible and accurate road administration beyond conventional constraints.

Smartphone surveying’s power in disaster response

When major disasters such as earthquakes or heavy rain cause landslides or inundation, municipal staff must quickly assess damage and plan restoration. Smartphone surveying proves highly effective in such emergency disaster responses. Staff arriving at affected sites can measure locations and extents of damage with just a smartphone and share that data immediately with supervisors and relevant departments at headquarters.

For instance, you can measure the length of a flooded road segment and water depth on site, create a simple plan drawing of the inundated area, and send it to the main office from the field. On a slope where a landslide has occurred, you can use the smartphone’s AR scanning function to capture point cloud data of the collapsed area and quickly estimate the volume of displaced soil. Survey tasks that once required waiting for specialist contractors can now be carried out by staff in the initial response stage, greatly speeding up damage documentation and decisions on emergency measures.

Moreover, photos of damaged sites taken with a smartphone are tagged with high-precision coordinates and camera orientation, making them very useful as official disaster-response records. Even when multiple staff members are assigned to different points, if each uploads photos with notes such as “Area X—water depth 50 cm (19.7 in)” and location information to the cloud, there is no later need to match photos with locations. All collected data are aggregated in real time on the cloud, allowing headquarters to immediately view each survey point on a map and aiding overall damage assessment and prioritization of support resources. Rapid sharing of disaster information via smartphone surveying and cloud management significantly enhances the quality of initial response and is indispensable for accurate disaster relief.

Summary of benefits from adopting smartphone surveying

By adopting smartphone surveying and cloud management, municipal field operations gain the following benefits:

• Simple operation, no specialist knowledge required: Intuitive smartphone operation allows staff without surveyor qualifications or advanced expertise to perform surveys. Personnel can be deployed to the field quickly without long training, helping to alleviate labor shortages.

• Immediate results on site, rapid turnaround: Measurement data are displayed and saved on maps in real time, enabling instant verification in the field. There is no need to return to the office for analysis or drawing preparation, dramatically increasing operational speed.

• High precision and improved reliability: RTK-capable smartphone surveying can obtain position information with centimeter-level accuracy (inches). This dramatically improves the precision of boundary surveys and recording of structure positions, reducing rework and re-measurement.

• Cost reduction and insourcing: Reducing the number of times work is outsourced can lower surveying costs. When municipal staff can complete tasks internally, know-how accumulates within the organization and can be applied to future map maintenance.

• Easy data sharing and integration: Data syncs immediately between field and office via the cloud, allowing multiple staff to share the latest information. Collected data can be easily integrated with GIS and other systems, and automation of reports and ledgers advances.

• Improved safety of operations: Surveying equipment is compact and lightweight, allowing staff to move more freely even in hazardous locations. One person can perform measurements in narrow or high places without heavy equipment, reducing accident risk.

The expanded world of smartphone surveying with LRTK’s “Simple Survey” feature

Choosing reliable tools is important to fully leverage smartphone surveying and cloud capabilities for cadastral survey work. One solution to watch is LRTK, a state-of-the-art smartphone surveying solution. LRTK is a high-precision GNSS positioning system developed based on technology from the Tokyo Institute of Technology, and when combined with a commercial smartphone it enables centimeter-level positioning that anyone can use easily. Among its features, the function set called “Simple Survey” is optimized for municipal fieldwork and offers the following characteristics:

• Photo positioning (positioned photos): When you take a photo with your smartphone, the exact coordinates of the shooting location and the camera orientation are automatically recorded. For example, when photographing a boundary marker, tag information such as “Boundary marker, Lot △△, City ○○, shot from the northwest, height 0.5 m (1.6 ft)” can be attached to the image. Photos can be synced to the cloud with one tap and organized on a map with position information, eliminating later work to match each photo to its location.

• One-tap coordinate recording: Attach a dedicated telescopic pole (monopod) to the smartphone, touch the pole tip to the point to be measured, and press a button to record the precise coordinates of that point. Height offset (the height from the ground to the smartphone) is automatically corrected, allowing accurate measurement of points on the ground surface. The ease of measuring ground points one after another without using a tripod is highly valued in the field.

• Cloud sync and sharing: Data collected with the LRTK app are uploaded to the cloud in real time. Results can be checked on an office PC immediately after being measured in the field, and other staff can share the data instantly. Because data are securely stored in the cloud, there is no risk of losing paper field books or ledgers.

• AR surveying and navigation: Measured point data and point cloud data can be displayed immediately as 3D models on the smartphone. Using AR, previously measured boundary lines or design drawings can be overlaid on the real-world view for easy on-site verification. For stake-out work at a specified coordinate, a navigation feature guides the user to the target point with on-screen arrow prompts. Even less-experienced staff can carry out positioning and measurement tasks without getting lost, improving reproducibility and quality of surveying.

By using LRTK’s “Simple Survey” features, your municipal field becomes virtually “a survey station anyone can use anytime.” With high-precision positioning and cloud integration, accurate and speedy surveying, drawing, and recordkeeping are possible in every scenario from boundary checks to disaster surveys. Consider incorporating this new approach to smartphone surveying into your operations—the accuracy and efficiency of your work will improve dramatically, and regional map maintenance and management will move to a new level. Details and case studies on LRTK are also available on the official website.

FAQ

Q1. Can smartphone surveying really achieve high accuracy? A. Yes. With appropriate equipment and conditions, smartphone surveying can achieve high positioning accuracy on the order of a few centimeters (a few in). By combining a dedicated RTK-capable GNSS receiver with a smartphone, surveying can be performed with accuracy comparable to conventional expensive surveying instruments. Verifications comparing coordinates obtained by smartphone surveying with Geospatial Information Authority of Japan control points have confirmed that the coordinates obtained by smartphone surveying have sufficient accuracy.

Q2. Can staff without surveying experience use it? A. Yes. Smartphone surveying is designed to be usable without specialist knowledge. Staff can perform surveys by following on-screen instructions, and the app handles complex calculations automatically. With short operational training, non-surveyor staff can carry out field measurements themselves.

Q3. Can the data obtained be used as documentation for cadastral surveys? A. The data obtained by smartphone surveying can be sufficiently utilized for cadastral surveys and registry documentation. High-precision coordinate values and drawing data can serve as evidence for boundary confirmations and identifying parcel boundaries, and, if necessary, can be incorporated into official results under the supervision of a licensed surveyor. Under current legal frameworks, a qualified professional’s confirmation is required for final registry drawings, but smartphone surveying data provide a valuable foundation.

Q4. What equipment and preparations are needed for introduction? A. Basically, you can start with a smartphone, an RTK-capable compact GNSS receiver, and a surveying app. A pole (monopod) for attaching the smartphone is useful for more accurate ground point measurements. A communication environment (mobile network or satellite communication) to receive real-time correction information is required; in urban areas this can be via mobile networks, while in mountainous areas you can use Michibiki’s CLAS signal. Large-scale equipment setup or extensive pre-preparation is generally unnecessary, so you can start surveying as soon as you decide to.

Q5. What are the costs to introduce smartphone surveying? A. Introduction costs are often lower compared to conventional surveying equipment. Although initial investment in high-precision GNSS receivers is necessary, they are less expensive than total stations or dedicated GNSS surveying systems. More importantly, reductions in outsourcing fees and labor cost savings from shorter work time are expected. Actual costs depend on the selected equipment and systems, but over the mid to long term this is generally a cost-effective investment.