Is the inspection work for utility poles (telegraph poles) a labor- and time-intensive task? Patrol the site, visually confirm deterioration, measure tilt, take photos and keep records… After returning to the office, you are overwhelmed by organizing the huge number of photos when transcribing into reports and ledgers. For power companies, telecommunications companies, and municipal staff responsible for pole maintenance, these conventional inspection flows are likely a significant burden.

In reality, electric power and telecommunications infrastructure companies manage hundreds of thousands of poles in their service areas and carry out numerous regular inspections and repair works every year. Many poles have been in place for decades and are aging, making planned maintenance indispensable. However, in recent years, staffing shortages and an aging workforce have become serious, forcing organizations to manage vast amounts of equipment with limited personnel. Improving efficiency and reducing labor in inspection work has become an unavoidable challenge.

One promising solution is “smart inspection” using digital technologies. While various initiatives such as drone aerial inspections and AI image analysis are starting, this article introduces a solution called LRTK, which revolutionizes pole inspections by combining a smartphone with high-precision positioning technology. Let’s look step by step at how it can solve the problems associated with traditional inspections.

Conventional utility pole inspection flow and common issues

First, conventional utility pole inspections have generally followed the flow below.

• Patrol / Visual confirmation: Inspectors patrol the assigned area’s poles and visually check for tilt, corrosion, slack in wires, equipment damage, etc.

• Measurement tasks: As needed, measure the pole’s tilt angle with measuring instruments and perform simple measurements such as checking guy-wire tension.

• Recording / Photography: Fill out paper inspection forms on site and photograph any abnormalities.

• Report organization: After returning to the office, transcribe the inspection form contents into ledgers (Excel, etc.) and link the photos taken to each pole’s record by renaming files and sorting into folders.

This method has maintained pole safety for many years, but it also creates various inefficiencies behind the scenes. The main issues are as follows.

• Risk of human error: Visual inspections performed by people are prone to oversights and judgment errors. Missing signs of deterioration can lead to serious accidents.

• Worker burden and safety: Visual confirmation at heights and long-distance patrols are strenuous and dangerous. With staffing shortages, the burden on each worker increases.

• Inefficiency of paper ledgers: Analog management that requires later transcription of handwritten field records is time-consuming and error-prone. There are many cases where ledgers diverge from actual conditions due to missing data entry.

• Linking photos to records: Even if many inspection photos are taken, organizing them later and correctly linking them to each pole’s record is cumbersome. Renaming file names and pasting them into ledgers takes time.

• Difficulty sharing information: Detailed field knowledge often remains in the heads of veteran employees, making it hard to share across the organization. When inspection data are scattered across paper and individual files, handovers and multi-site information sharing do not progress.

These problems suggest that conventional methods will struggle to meet the growing inspection needs and aging infrastructure demands in the future. A new method is needed that can efficiently and reliably grasp pole conditions without allocating excessive manpower and time.

Overview of smart inspections enabled by LRTK

So how can these issues be solved with LRTK? LRTK is a small high-precision positioning device used in combination with a smartphone that transforms field inspections. Smart pole inspections using LRTK enable the digitalization and labor-saving of the inspection flow—from high-precision point cloud data acquisition to automatic photo-record linking, AR-based location guidance, and cloud-based record management. Let’s look at the specific features in order.

High-precision 3D point cloud scanning: By using an LRTK receiver attached to a smartphone to position yourself with centimeter-level accuracy (half-inch accuracy) while scanning the area around the pole with the smartphone’s built-in LiDAR or camera, you can obtain a precise 3D point cloud model of an entire pole in a short time simply by walking around it. Each point in the acquired point cloud data is assigned accurate coordinates (latitude, longitude, height) in real time, generating a distortion-free high-precision digital pole model on the spot. Tilt angles and height dimensions can be measured later from the data, eliminating the need to measure each item one by one with surveying instruments as before. Because anyone can handle it with a smartphone in one hand, objective inspections that do not rely on the intuition of veterans become possible.

Coordinate-tagged photos and automatic linking: Inspection photos taken with the smartphone are also tagged with high-precision location information. Coordinates (latitude/longitude) and heading data are recorded for each photo, so the system automatically organizes and identifies which pole and which part of the pole each photo depicts. For example, if you select a pole ID in the app before taking a photo, that photo will be saved in the cloud linked to the corresponding pole data. There is no need to bother with renaming files or sorting them. With coordinate-tagged photos obtained together with point cloud data, you can compare images and 3D models later in the office for detailed review.

AR-based location guidance and on-site confirmation: LRTK’s high-precision positioning allows AR (augmented reality) location guidance on the smartphone screen. Since the app can navigate with arrows and markers overlaid on the viewfinder to show where the pole to be inspected is on the map, the effort of searching for poles on site is reduced. This is especially useful in mountainous areas or at night when pole numbers are hard to read visually—following AR guidance leads you to the target pole. If past inspection data are already registered in the cloud, they can be retrieved and displayed on-site through the smartphone. For example, previous inspection notes can be highlighted at the pole’s position, visualizing on-site confirmation tasks and helping prevent mistakes.

Cloud-based data management and sharing: Point cloud data and photo records acquired with LRTK are uploaded to the cloud and centrally managed. Instead of paper ledgers or Excel files on local PCs, data accumulate in a cloud-based digital ledger in real time. This greatly reduces the work of entering data and organizing files after returning to the office. On the cloud platform, the uploaded point cloud can be displayed in a 3D viewer for easy measurement of distances and angles, and for comparison with past data. Pole data can also be visualized as an asset map linked to a geographic information system (GIS), allowing changes occurring on site to be shared company-wide immediately. Multiple staff and partner companies can always view the latest information, enabling unified maintenance management across the organization.

By using LRTK in this way, every step of field inspection can be digitized and automated, significantly reducing labor-intensive tasks and analog processing. Next, let’s look at representative use cases that demonstrate the concrete benefits of smart pole inspections.

Use cases for smart pole inspections

• Early detection of tilt and collapse risks: From point cloud data, you can quantitatively measure the pole’s tilt and minute deformations, so you won’t miss the “buds” of abnormalities. If the tilt angle has increased by several degrees compared to the previous inspection, preventive measures such as repairs or replacement can be taken before collapse occurs. Shifting from reactive responses to preventive maintenance ultimately reduces the risk of equipment accidents and service interruptions. Also, when poles are damaged by typhoons, earthquakes, or other disasters, scanning the site and sharing it on the cloud enables accurate damage assessment from remote locations and aids in rapid recovery planning.

• Detailed recording and quantitative evaluation of corrosion and damage: High-precision 3D models and coordinate-tagged photos allow detailed recording of deterioration such as cracks on the pole surface or rust on metal parts. The extent of corrosion, previously dependent on the inspector’s subjectivity, can be evaluated with objective numerical values by measuring dimensions and areas on the point cloud data. For example, you can specifically determine that “the rusted area has expanded since the last inspection” or “the crack length increased by ◯ cm (◯ in),” and analyzing accumulated data reveals the rate of deterioration progression. This enables prioritization of repairs and part replacements based on scientific evidence.

• Efficient management of attachments on poles: Poles often have various add-ons such as communication cables, signs, and lighting installed later, which can sometimes result in unexpected loads or space occupancy. With smart inspection, the entire current condition of each pole is digitized into 3D data, making it possible to grasp all equipment attached to that pole. Added cables or unauthorized posters that have appeared over time are recorded without being overlooked. Early detection and correction of such excess loads or improper installations help maintain pole safety and thorough asset management. When installing new equipment, layout can be considered in advance on the point cloud data, facilitating smooth checks of space and strength.

• Centralized management across multiple sites and rapid information sharing: Since data accumulate in the cloud, latest information can be shared even when managing wide-ranging infrastructure across multiple locations. Data acquired by regional inspection staff can be viewed instantly on the cloud, allowing headquarters or other departments to understand on-site conditions and provide advice without being physically present. Integrating inspection records that were previously scattered by branch or individual turns person-dependent equipment information into organizational knowledge. As a result, coordination with remote locations and information transmission to contractors speeds up, enabling cross-organizational maintenance planning and decision-making to proceed smoothly.

Conclusion

The emergence of simple 3D surveying technology combining a smartphone and LRTK is set to greatly change the way utility pole inspections are conducted. By replacing work that used to rely on manpower and experience with digital data, a new maintenance style that achieves both efficiency and improved accuracy is becoming a reality. Freeing field teams from paper forms and analog measurements will allow limited personnel to manage more assets safely.

Furthermore, 3D measurement using LRTK is powerful beyond inspections. In planning and construction for new installations or relocations, scanning the site in advance makes it possible to grasp the ground and surrounding environment three-dimensionally, enabling consideration of obstructions or optimization of route design that might not be apparent on drawings. Keeping as-built conditions as point cloud data in the cloud after construction provides accurate record assets that help future maintenance and expansion work. Design and construction management, which used to rely on experience and intuition, can incorporate rational decisions based on digital data.

Advanced 3D measurement may seem daunting, but we are in an era when anyone can easily perform centimeter-level accuracy (half-inch accuracy) positioning and point cloud acquisition with just a smartphone and a small device. LRTK, in a sense “a 3D surveying device per person,” has made field DX a realistic and accessible option. Smartifying pole inspections is not the goal but the starting point. With this opportunity, why not consider introducing this new technology to your infrastructure management? LRTK can be a powerful partner to help take your field operations to the next stage.