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 workflow efficiency with cloud management

• Using smartphone surveying for boundary confirmation and cadastral map updates

• Using smartphone surveying for road ledger maintenance

• Smartphone surveying proving powerful in disaster response

• Summary of benefits of adopting smartphone surveying

• The expanded world of smartphone surveying with LRTK’s “simple surveying” features

• FAQ

Traditional cadastral survey work and its challenges

Cadastral surveys undertaken by municipal governments are an important undertaking to accurately grasp the boundaries, areas, and ownership information for each land parcel in a region. Driven by municipalities under the National Land Survey Act, this work is often described as creating the “family register” of land. However, despite cadastral surveying having been conducted for more than 70 years since 1951, it is said to have been completed for only about half of the country, and boundary information remains unorganized in many areas.

One reason cadastral survey work has progressed slowly is that conventional methods require substantial time and effort. Determining boundaries and creating or updating cadastral maps requires highly skilled surveyors and expensive surveying equipment, making it difficult for municipal staff alone to complete the work. In many cases, municipalities must commission external specialists such as licensed surveyors, which involves long lead times and high costs from contracting to delivery of final products. Moreover, there are few staff within municipalities who have surveying know-how, and issues such as workforce shortages due to retirement of veteran technicians and the difficulty of transferring skills are serious. As a result, surveys cannot always be performed when needed, and boundary confirmations and map updates often lag. Adverse weather and scheduling constraints can also force postponement of fieldwork, causing further delays.

For example, even a single boundary on-site meeting traditionally required gathering landowners while a professional surveyor used a total station to measure points, then later produced drawings based on that data. Outsourcing such work is expensive, so it cannot be done frequently within budget, and it can take a long time to finalize boundaries. Likewise, measuring road widths and recording the positions of structures for road ledgers relied heavily on the experience and manpower of seasoned staff, imposing major burdens on responsible departments. In recent years, increasing natural disasters have also made it time-consuming to grasp damage on site. When a major disaster occurs, bringing in specialist survey teams with equipment tends to delay initial response, potentially hindering recovery planning.

In this way, municipal cadastral survey work faces many problems: reliance on external parties leads to time and cost burdens, technical knowledge is hard to accumulate in-house, and rapid surveying in emergencies is difficult. Is there a way to dramatically solve these issues? One promising solution gaining attention is “smartphone surveying,” a new surveying method using smartphones, combined with “cloud management” that enables real-time sharing and management of survey data.

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

“Smartphone surveying” is, as the name suggests, a new surveying method performed using a smartphone. Modern smartphones are equipped with advanced sensors such as GPS, cameras, accelerometers, and gyroscopes, and combining these with a dedicated compact GNSS receiver (positioning device) enables remarkably high-precision position measurements. Conventional consumer GPS typically has errors of several meters, but connecting an RTK (Real Time Kinematic)-capable receiver to a smartphone can reduce positioning errors to within a few centimeters (within a few inches). RTK is a positioning technique that uses real-time correction information in addition to satellite signals to achieve precise positioning, allowing centimeter-level accuracy (half-inch accuracy) that previously required professional surveying equipment to be achieved on a smartphone.

Smartphone surveying is also extremely easy to operate, and one major feature is that virtually anyone can use it without specialized expertise. Just attach a compact GNSS receiver to the smartphone and launch a dedicated app to be ready. The map on the screen shows your current position, and when you reach the point you want to measure, simply tap the button on the screen to record the accurate coordinates of that point. When measuring multiple points, there is no need to repeatedly set up tripods or heavy equipment; you can move while holding the smartphone and continuously capture points. For example, surveys of large parks or long roads can collect the necessary data quickly and efficiently.

You might worry whether mobile network connectivity is required for positioning. Smartphone surveying has mechanisms to maintain high precision even in areas with poor reception such as mountain regions. Using a GNSS receiver that supports Japan’s quasi-zenith satellite system “Michibiki” centimeter-class positioning augmentation service (CLAS) ensures accuracy via augmentation signals from satellites even far from base stations. In other words, as long as the receiver can pick up satellites overhead, centimeter-level positioning is possible even outside mobile network coverage, so smartphone surveying performs well in forests, remote islands, and similar sites.

Depending on the smartphone and app features, a variety of helpful functions can support field surveying. Combining the smartphone camera with AR (augmented reality) allows distance and angle overlays on the camera view or enables on-the-spot linking of measured points to draw a simple plan. For example, measuring boundary markers in order can draw the property boundary line on site. Recent features also allow scanning the surroundings with phone sensors to obtain 3D point cloud data, useful for understanding terrain and structures three-dimensionally and for volume calculations. In this way, smartphone surveying can provide immediate, accurate surveying and drafting on site without special equipment or advanced skills, holding great potential to transform cadastral survey work.

Expanded data sharing and workflow efficiency with cloud management

Alongside smartphone surveying, “cloud management” is a key capability not to be overlooked. Traditionally, field survey data were kept in paper field books or drawings and later scanned or manually digitized, creating duplicated effort between field and office and increasing the chance of errors. Introducing cloud management can greatly reduce such inefficiencies. Coordinate data and photos captured by smartphone survey apps 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 the municipality’s GIS (geographic information system) or internal map management systems. For example, importing boundary point coordinates and parcel shape data obtained via smartphone surveying directly into GIS removes the need to rescan paper maps or manually enter coordinate values. As a result, digital updates of cadastral maps and land ledgers can be carried out rapidly, enabling quick responses to residents’ inquiries and efficient cross-checks with registry records. Automatic cloud saving also eliminates the risk of losing paper drawings or field books, providing secure backups in the event of disasters. With the latest data always shared among stakeholders in the cloud, cross-departmental cooperation and decision-making are also smoother.

By combining cloud management, the process from data capture to utilization becomes seamless, dramatically improving overall administrative workflows involved in cadastral surveying. Digital work processes using smartphone surveying and the cloud will be a driving force to powerfully advance DX (digital transformation) in municipal mapping administration.

Using smartphone surveying for boundary confirmation and cadastral map updates

Smartphone surveying is highly effective for the core cadastral task of boundary confirmation. Previously, staff verifying boundary markers on site typically compared positions visually using paper maps or cadastral maps. With smartphone surveying, however, you can measure and record the exact coordinates of boundary markers on the spot and immediately compare them with existing cadastral map data. Displaying current cadastral maps or old maps on the smartphone screen and overlaying measured points makes discrepancies in boundary lines or area differences instantly apparent.

For example, during a boundary confirmation conducted with landowners present, staff can measure boundary points with a smartphone so that all stakeholders 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 is off by a few centimeters (a few inches)” facilitates evidence-based consensus. It also removes the need to later redraw surveys and mail them out, enabling agreement documents to be prepared during the meeting. Furthermore, precise data obtained by smartphone surveying can serve as supporting official survey material and provide data precise enough to attach to cadastral survey results or registry application documents.

In addition, boundary point and parcel shape data obtained via smartphone surveying can be immediately reflected in internal systems through the cloud, greatly accelerating updates to cadastral maps and land ledgers. This approach is far more accurate and less laborious than scanning and correcting old paper maps, contributing to increased trustworthiness of map data. Consequently, corrections to cadastral maps and boundary identification work become more efficient, and responses to residents’ inquiries and cross-checks with registry records become faster. Combining smartphone surveying with cloud management creates a seamless flow from boundary confirmation to registry updates, significantly advancing municipal cadastral management.

Using smartphone surveying for road ledger maintenance

Smartphone surveying is also extremely useful for maintaining and updating road ledgers, which document road widths and ancillary facilities under the jurisdiction of road management departments. Traditionally, measuring road widths required tape measures and specialized equipment for calculating curve radii. Recording positions of road accessories such as guardrails, signs, and drainage structures often meant writing them into paper ledgers on site and later transcribing them into digital maps at the office, duplicating effort and increasing the risk of errors. Accurate drafting often relied on veteran staff, making it difficult for others to produce correct maps.

By introducing smartphone surveying, such road condition measurements can be carried out efficiently by a single person. Distances from one side of a 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 calculated from coordinate data obtained on site. All measured values and coordinates are digitally recorded in the app, eliminating the need to tidy up drawings back at the office and preventing simple transcription errors. In addition, photos of road facilities taken with the smartphone are saved with location tags, clearly indicating which photo corresponds to which location. For example, a photo of a deteriorated guardrail will automatically include the latitude and longitude and the camera orientation, preventing confusion when reviewing photos later.

Of course, field-collected data are instantly synchronized to the cloud, allowing office PCs to confirm the latest information in real time. Because field data can be immediately shared within the department, dividing inspection tasks among multiple people becomes efficient. This digitization dramatically speeds up road ledger updates and promotes DX in maintenance management. From routine road inspections to emergency post-disaster checks, combining smartphone surveying with cloud-based data management enables flexible and accurate road administration unbound by traditional practices.

Smartphone surveying proving powerful in disaster response

When large-scale disasters such as earthquakes or heavy rain cause landslides or flooding, municipal staff must quickly survey damage and prepare recovery plans. Smartphone surveying is highly effective in such emergency disaster response. Staff arriving at damage sites can use just a smartphone to measure locations and extents of damage and immediately share that data with headquarters and related departments.

For example, you can measure the length of a flooded road segment and water depth on site, create a simple plan of the inundation area, and send it to headquarters. On a slope where a landslide has occurred, you can use the smartphone’s AR scanning feature to capture the collapsed area as point cloud data and rapidly estimate the volume of displaced soil. Tasks that previously required waiting for specialist contractors can now be performed by staff during the initial response, greatly accelerating 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 highly useful as official records. When multiple staff cover separate locations, each person’s photos can include notes such as “XX district – inundation depth 50 cm (19.7 in)” along with location data and be shared via the cloud, avoiding later work to match photos to places. All collected data are aggregated in the cloud in real time, enabling headquarters to view each survey point on a map and quickly grasp overall damage and prioritize deployment of support resources. Rapid sharing of disaster information via smartphone surveying and cloud management markedly improves initial response quality and is indispensable for precise disaster relief.

Summary of benefits of adopting smartphone surveying

Adopting smartphone surveying and cloud management brings the following benefits to municipal field operations:

• Easy operation, no specialist knowledge required: Intuitive smartphone operation allows staff to perform surveying without needing a surveyor qualification or advanced expertise. Staff can be deployed to the field without long training periods, helping mitigate personnel shortages.

• Immediate on-site results and speed: Measurement data are displayed and saved on maps in real time, allowing immediate confirmation on site. There is no need to return to the office for analysis or drawing, dramatically speeding up work.

• Higher precision and improved reliability: RTK-capable smartphone surveying can obtain position data with centimeter-level accuracy (half-inch accuracy). Boundary surveys and records of structure locations become far more precise, reducing rework and re-measurement.

• Cost reduction and in-house capability: Reducing the need to outsource saves surveying costs. With municipal staff able to complete tasks internally, know-how accumulates within the organization and benefits future mapping work.

• Easy data sharing and integration: Cloud sync ensures field and office data are always up to date and shareable among multiple staff. Collected data can be integrated with GIS and other systems, and report and ledger generation can be increasingly automated.

• Improved safety of operations: Smaller, lighter equipment allows staff to move easily even in hazardous areas. Single-person measurements can be done in confined or elevated locations without heavy equipment, lowering accident risk.

The expanded world of smartphone surveying with LRTK’s “simple surveying” features

Choosing reliable tools is also important to fully leverage smartphone surveying and cloud use for cadastral work. One noteworthy solution is LRTK. LRTK is a high-precision GNSS positioning system developed based on technology from the Tokyo Institute of Technology, and it enables anyone to achieve centimeter-level positioning when combined with commercially available smartphones. Among its features, the set known as “simple surveying” is optimized for municipal fieldwork and offers the following characteristics:

• Photo positioning (positioned photo) function: When you take a photo with your smartphone, the precise coordinates of the shooting location and the camera orientation are automatically recorded. For example, taking a photo of a boundary marker can attach tag information such as “Boundary marker at 123-4, Example City, photographed from the northwest at a height of 0.5 m (1.6 ft).” Photos can be synced to the cloud with one tap and organized on a map with location information, eliminating the need to match photos to locations later.

• One-tap coordinate recording: Attach a dedicated telescoping pole (monopod) to the smartphone, place its tip on the point to be measured, and press a button to record the precise coordinates of that point. Because height offsets (the height from the ground to the smartphone) are automatically corrected, ground points can be measured accurately. The convenience of measuring ground points one after another without setting up a tripod is highly valued in the field.

• Cloud sync and sharing: Data acquired by the LRTK app are uploaded to the cloud in real time. Results can be checked on an office PC immediately after measurement and shared with other staff. Data are securely stored in the cloud, eliminating the risk of losing paper field books or ledgers.

• AR surveying and navigation: Measured point data and point clouds can be displayed as 3D models on the smartphone immediately. Using AR, previously measured boundary lines or design lines can be overlaid on the real scene for on-site verification. For pegging out specified coordinates, a navigation function guides you to the target point with on-screen arrow instructions. This helps less-experienced staff perform staking tasks correctly, improving reproducibility and quality of surveying.

By utilizing LRTK’s “simple surveying” features, your municipality’s field becomes like a “surveying office available anytime, to anyone.” High-precision positioning technology combined with cloud integration enables accurate, speedy surveying, drafting, and record-keeping in every scenario from boundary confirmation to disaster surveys. Consider adopting this new world of smartphone surveying in your operations: both accuracy and efficiency will leap forward, advancing regional map maintenance and management to a new stage. Details and case studies on LRTK are also introduced 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 (within a few inches). Combining a dedicated RTK-capable GNSS receiver with a smartphone enables surveying with accuracy comparable to conventional expensive surveying instruments. Verification against control points of the Geospatial Information Authority of Japan has confirmed that coordinates obtained by smartphone surveying can have sufficient accuracy.

Q2. Can staff with no surveying experience use it? A. Yes. Smartphone surveying is designed to be usable without specialist knowledge. Staff can perform surveys by following on-screen steps, and complex calculations are handled automatically by the app. With short operational training, non-surveyor staff can conduct field measurements themselves.

Q3. Can the acquired data be used as materials for cadastral surveys? A. Data obtained by smartphone surveying can be sufficiently utilized for cadastral surveys and registry materials. High-precision coordinates and drawing data can serve as evidence for boundary confirmation and boundary identification, and can be incorporated into official outputs under the supervision of licensed surveyors if necessary. Under current legal frameworks, final registry drawings require verification by qualified personnel, but smartphone surveying data provide a strong foundation for that work.

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

Q5. How much does it cost to introduce smartphone surveying? A. Introduction costs are often lower than for conventional surveying instruments. Initial investment in high-precision GNSS receivers is required, but these are typically cheaper than total stations or dedicated GNSS surveying instruments. Moreover, reducing outsourcing and shortening work time can yield labor cost savings. Specific costs depend on the chosen equipment and system, but in the medium to long term it is generally a cost-effective investment.