Utility Pole Inspections Become Astonishingly Efficient! 5 Benefits of Introducing LRTK

Introduction

There are roughly 36 million utility poles across Japan supporting lifelines such as power and communications. In recent years, efforts to bury overhead lines (pole elimination) have been promoted from aesthetic and disaster-prevention perspectives, but removing all poles nationwide would require enormous time and cost. Therefore, it remains important to maintain and secure the existing utility poles through planned maintenance.

These utility poles require regular inspections to check for deterioration or abnormalities. However, pole inspection work imposes a massive workload and heavy burden on field crews due to the sheer number of targets. Current patrol inspections, which rely on personnel visually checking each pole, require traveling from steep mountain areas to congested urban streets, making them labor- and time-intensive hard work. In rural areas in particular, experienced maintenance staff are aging and dwindling, so a limited workforce must maintain widely dispersed infrastructure. Inspection items are also diverse—checking for tilt, corrosion, damage, and so on—and it is not easy to perform these detailed checks without omissions. If deterioration is overlooked, it can lead to serious accidents such as pole collapse or power outages, so reliable inspections are essential.

There are also issues with how inspection results are recorded. Traditionally, paper forms or digital camera photos with handwritten notes have been the norm, making comparisons with past inspection results and managing histories of abnormal locations time-consuming. Inefficient tasks and human errors—such as re-entering field-recorded information back at the office—are common. Note that routine patrol inspections of utility poles are normally performed every few years, and emergency inspections are conducted after typhoons or earthquakes. Rapid and accurate responses are required on-site, but with staffing shortages progressing, it is becoming increasingly difficult to meet these needs using conventional methods.

Against this backdrop, there is a strong demand for operational reform through digital transformation (DX) in pole maintenance operations. Recently, improvements using drones and AI image analysis have been explored to enhance inspection efficiency, but these often require procuring specialized equipment or specialized skills, limiting widespread adoption in the field.

At the same time, attention is focusing on the latest on-site DX tool “LRTK,” which leverages smartphones. This article explains what LRTK is and details the concrete benefits and effects of introducing it to utility pole inspections.

What is LRTK? An on-site DX tool that delivers centimeter-level position recording on a smartphone

LRTK is a high-precision positioning system that makes Real Time Kinematic (RTK) technology easy to use on smartphones. RTK is a technique that corrects satellite positioning (GPS/GNSS) errors to dramatically improve positioning accuracy, and LRTK achieves centimeter-level positioning by attaching a dedicated compact receiver to a smartphone. While normal smartphone GPS has positional errors on the order of meters, using LRTK reduces that error to within several centimeters. Traditionally, centimeter-level positioning required expensive fixed GNSS receivers or total stations, but LRTK enables these capabilities with just a smartphone.

Additionally, by utilizing augmentation signals from Japan’s quasi-zenith satellite system (Quasi-Zenith Satellite System, “Michibiki”), LRTK can maintain stable centimeter-level accuracy even in areas with tall buildings or dense trees.

LRTK is also designed to work in conjunction with a smartphone’s built-in camera and sensors. For example, it can combine the phone camera or LiDAR to perform 3D scanning of the surroundings while attaching high-precision coordinate data to each point. It also includes a “coordinate navigation” feature that guides workers to pre-specified coordinates—by following on-screen arrow guides, users can pinpoint the target location. Acquired data can be uploaded to the cloud on-site, enabling immediate sharing of geotagged photos and inspection results from the field.

Field deployment is simple: attach a pocket-sized compact device (weighing approximately 125 g and about 13 mm thick) to a smartphone and launch the dedicated app to start positioning immediately—no complicated operations or adjustments are required. The interface is intuitively designed, so field staff can quickly master it without being specialized technicians.

In short, LRTK is an on-site DX tool that allows surveying and positioning work, which previously required dedicated equipment, to be completed with a single smartphone. Because accurate measurement and recordkeeping can be done on-site without specialized surveying instruments or inclinometers, ease of use for anyone is a major feature. For utility pole inspections, LRTK enables everything from location recording to condition measurement and information sharing with a smartphone, dramatically improving field work efficiency and accuracy. Now let’s look at five specific benefits of introducing LRTK to utility pole inspections.

Five benefits of introducing LRTK to utility pole inspection work

• Record utility pole locations with centimeter-level accuracy By using LRTK, each utility pole’s installation location can be precisely measured and digitally recorded. Where previously locations were only roughly identified on a map, obtaining centimeter-level coordinates makes it possible to create an accurate infrastructure ledger. Even in mountainous or intricate urban areas, poles can be identified based on GPS coordinates to prevent missed inspections or misidentifications. Position information is automatically tagged to photos taken during inspections, so it is immediately clear “which pole a photo was taken at,” making report generation smoother. Accurate coordinate data also proves powerful in disaster recovery: the positions of collapsed poles can be quickly identified, allowing recovery teams to be routed directly to the site via AR guidance and thereby speeding initial response.

• Easily measure pole tilt on-site Concrete poles can gradually tilt due to aging or ground subsidence. With LRTK, a smartphone’s tilt sensors and AR features can be used to measure a pole’s tilt angle on the spot. This makes it possible to accurately capture slight tilts that are difficult to notice visually as numerical data. For example, if a pole’s tilt was 2 degrees at the last inspection and has increased to 3 degrees now, it can be judged that tilting is progressing and an early repair plan can be made. Measurement data are stored in the cloud and can be compared over time, supporting data-driven preventive maintenance when abnormal tilting progresses.

• Map abnormal locations on a digital map LRTK allows deterioration and damage found during inspections to be digitally mapped on-site. When cracks, corroded bolts, or other anomalies are discovered, workers can take photos with their smartphone, attach position coordinates and simple notes, and plot them on a cloud-based map. Visualizing abnormal locations on a map makes it easy to see at a glance where defects are concentrated. Managers can prioritize repairs by viewing the map, and workers can address repair-needed poles without missing them. Because the map is shared among all responsible parties, field and management teams can coordinate using the same information. After repairs, the map can be updated to reflect the new condition, enabling centralized history management from detection to resolution.

• On-site guidance and verification using AR LRTK’s coordinate navigation guides workers to specified poles accurately via AR. For example, if a target pole is hard to find visually at night or is hidden by vegetation, following the arrows and distance information on the smartphone screen will lead to the correct pole with an error of only a few centimeters. Even in complex locations, following the camera-overlaid guide ensures the correct identification of the target pole, preventing inspection mix-ups. Once on-site, workers can also overlay identification information and past inspection data on the phone screen via AR to confirm details. Being able to intuitively reference information like “which pole is next” or “where past anomalies were recorded” on the spot improves inspection accuracy and repeatability. Because position identification no longer relies solely on a veteran’s intuition, less-experienced workers can reach inspection points without hesitation.

• Centralize information with cloud sharing and history management Inspection data acquired with LRTK are shared to the cloud on-site so all stakeholders can view them in real time. Photos and measurements taken in the field are automatically uploaded to the cloud, eliminating the need to transfer photos via USB or recreate paper reports back at the office. Immediate sharing between field and office enables remote monitoring of inspection status and issuance of appropriate instructions. The cloud accumulates inspection histories for each pole, allowing quick searches of past repair records and inspection dates, improving the accuracy of long-term asset management and aging analysis. Compared with paper-based management, human error is reduced and data are reliably accumulated, simplifying future audit responses. Digitizing forms also advances paperless operations, contributing to reduced environmental impact. Moreover, accumulated data can be used to automatically generate inspection reports or to update asset management ledgers by linking with GIS (geographic information systems), enabling expanded operational efficiency through data utilization.

Ripple effects of introducing LRTK

Introducing LRTK into utility pole inspections produces a variety of positive ripple effects on on-site work styles and management methods. Below are the main effects.

• Labor savings and efficiency: A single worker can perform high-precision inspections with just a smartphone, significantly simplifying tasks that previously required multiple people. Travel time and equipment setup time are reduced, allowing many more poles to be inspected in a short time. Because one device handles surveying, photography, recordkeeping, and navigation, there is less need to procure multiple specialized tools, reducing equipment purchase and maintenance costs. Labor savings free up capacity for other maintenance tasks, enabling more effective use of limited personnel.

• Standardization of work quality: Inspections that previously relied on veterans’ intuition and experience can be performed at a consistent quality by anyone with LRTK support. Decisions can be based on numerical data such as tilt angles and coordinates, enabling objective evaluations not swayed by subjectivity. Variations in check quality between experienced staff and newcomers are reduced through the tool’s support, making it easier for newcomers to conduct inspections without errors and allowing organizational sharing of previously person-dependent know-how. Additionally, running PDCA cycles based on data enables continuous improvement of inspection methods.

• Improved safety: Shorter work times at hazardous sites help ensure worker safety. For roadside pole inspections, shorter on-site times reduce the risk of traffic accidents. AR navigation enables quick identification of target equipment even in dark or low-visibility conditions, improving safety for night work. Early detection of defects and planned countermeasures help prevent serious accidents such as falling wires or electric shocks.

• Strengthened asset management: Centralized cloud management of inspection data enables continuous awareness of infrastructure asset conditions. Shared information across the organization makes cross-departmental coordination and reporting easier. When necessary, information sharing between power companies and telecom operators also becomes easier, strengthening region-wide infrastructure protection. Accumulating long-term data allows analysis of pole aging and failure trends to formulate strategic maintenance plans. Proper data retention also eases handovers during staff changes or generational shifts, allowing organizations to leverage asset information over the long term. Utilizing the big data collected from the field can drive the sophistication and smartification of infrastructure management. Furthermore, AI analysis of accumulated data can enable early detection of anomalies and automated aging assessments, paving the way toward smart maintenance.

Expanding possibilities for LRTK in the field

LRTK is already being trialed across various sites, and its effectiveness is being proven. For example, a regional power company introduced LRTK for distribution line patrols in mountainous areas. Where previously patrol inspections required a three-person team including experienced staff and took half a day, using LRTK allowed a single person to complete a similar range in a few hours. The number of poles that could be patrolled in one day roughly doubled compared to before, achieving dramatic efficiency gains. Coordinate navigation allowed workers to locate target poles even in dense undergrowth, improving travel efficiency, and quantitative data such as tilt angles improved inspection accuracy. As a result, total personnel-hours required for inspections were halved, while achieving zero missed inspections and thorough safety management. Shorter work times also enabled realistic inspection scheduling and were reported to reduce near-miss incidents, improving safety.

In another municipality, LRTK is used to maintain streetlight poles and signposts. Even for streetlights whose pole numbers are hard to confirm visually during nighttime patrols, following LRTK’s AR guidance reliably leads workers to the correct equipment. With a smartphone camera, the management number and last inspection date of the streetlight are displayed, helping prevent omissions and mix-ups. Automatically geotagged photos improve report generation efficiency and speed information sharing with headquarters. On sites that have experienced LRTK’s convenience, expansion to other equipment inspections is being considered.

Railway companies have also introduced LRTK for regular inspections of catenary poles (poles that support overhead power lines). During annual inspections, saved coordinate data can be used to navigate to the exact same points each time, greatly reducing oversights in multi-year comparative studies. Even equipment hidden by trees or buried by snow can be reliably located if coordinates are known, dramatically improving inspection accuracy and efficiency during winter and nighttime patrols.

These success stories show that LRTK can contribute as a versatile solution for DX of inspection across various infrastructure assets, not just utility poles. Additionally, the Geospatial Information Authority of Japan and some local governments have used LRTK in disaster damage surveys, where its accuracy and speed have been highly praised.

Conclusion

As utility poles across Japan age, introducing LRTK is a powerful first step toward on-site DX for their maintenance and management. If cumbersome inspections can be completed with a single smartphone, organizations can offset workforce shortages while achieving both safety and quality of work. DX does not happen overnight, but now is an opportune time to begin on-site DX. When introducing LRTK, it is advisable to start with pilot operations in some teams or regions so field staff can become familiar with the tool. Initial setup and cloud connectivity are simple, and data linkage with existing management systems is possible, so LRTK can be deployed smoothly without major disruptions to existing workflows. By developing operational procedures for both field and management teams and gradually expanding the scope of application, an organization can steadily reap the benefits of DX. LRTK itself continues to be updated in line with advances in smartphones and GNSS satellite technologies, and further functional expansions tailored to the latest environments can be expected. This ongoing evolution makes LRTK a reliable partner in promoting DX.

Start by trying LRTK on simple daily surveying tasks to experience its effects in the field. These small steps will eventually lead to major operational reforms. Consider exploring LRTK for streamlining utility pole inspections in your company.

Make full use of LRTK’s five benefits and harness digital technology to help shape the future of infrastructure inspections.