Don’t Miss Out! Pole Inspections Dramatically Evolve with High-Precision AR from LRTK

The importance of pole inspections and often-overlooked issues

Utility poles (commonly referred to as “telephone poles” or “power poles”) are critical infrastructure supporting power and communication systems. Regular inspections are required to maintain safety and reliability. However, conventional inspection methods often rely heavily on human visual checks and experience, leaving hidden issues that are easily overlooked, such as subtle tilt, slight misalignment of equipment mounting positions, structural deterioration, and discrepancies with drawings or asset registers.

For example, even a slight tilt of a pole that progresses gradually over many years can be missed by the naked eye. Likewise, it is not easy on-site to instantly confirm whether accessories like transformers or cables attached to the pole are positioned as designed, or maintained at appropriate heights and locations. Furthermore, with concrete poles there may be cracks or exposed rebar, and with wooden poles there may be rot or termite damage—early-stage deterioration can be hard to detect from visual inspection alone. In addition, old drawings or asset registers are often not up to date, and there are many cases where the on-site reality does not match the design drawings. Field workers typically compare paper drawings by hand, but in urban areas with many repair histories, discrepancies such as “assets that aren’t supposed to exist on the drawing actually being present in the field” frequently occur.

Thus, pole inspection work not only has room for efficiency improvements but also harbors risks due to oversights or information mismatches. In fact, there have been cases where inexperienced staff made reporting errors or missed signs of deterioration that nearly led to serious incidents. To maintain infrastructure safely and reliably, improving inspection methods and promoting DX (digital transformation) are urgent. Recently, a promising solution attracting attention is the combination of AR (augmented reality) technology and high-precision positioning (RTK).

Possibilities for pole inspection expanded by AR × high-precision positioning

AR overlays digital information—such as CG models or text—onto the real-world image seen through a camera on a smartphone or similar device. On the other hand, high-precision positioning RTK (Real Time Kinematic) is a positioning method that applies correction data to GNSS (satellite positioning) to determine positions with errors down to a few centimeters (a few in). By combining these technologies, digital information can be accurately aligned with real space. Conventional smartphone GPS can have errors on the order of several meters (several ft), which raises concerns that AR-displayed equipment models could be far off from their real-world positions. However, by attaching an RTK-capable compact receiver to a smartphone, correction data from a reference station allows current positions to be obtained at centimeter-level accuracy (half-inch accuracy), enabling markerless, high-precision AR.

So what specifically changes on-site with AR × high-precision positioning for pole inspections? The biggest benefit is a dramatic improvement in on-site information visualization. When an inspector points a smartphone camera at a pole, tags appear on the screen showing the names of equipment mounted on that pole and inspection items. For example, if the camera is aimed at the top of the pole, arrows will indicate locations of components prone to deterioration such as insulators and metal fittings, and concrete check instructions like “check bolt looseness” or “photograph for cracks” will be displayed instantly. If routes of buried communication or power cables have been measured and registered in advance, those underground routes can be visualized on the smartphone screen, allowing confirmation of unseen obstacles before excavating as if “seeing through” the ground.

Next, the ability to display comparisons makes anomaly detection easier. Past inspection data or design drawings can be shown in AR on-site and overlaid for comparison with current conditions, making differences or misalignments immediately obvious. For example, by calling up a photo taken during the previous inspection and viewing the current pole in the same composition through AR, the progression of aging can be intuitively assessed. It’s also possible on the spot to check whether the pole or attached equipment has moved or deformed relative to the position or height specified in the design drawings. Without having to spread paper drawings or past photos, inspectors can compare “then and now” and “design and actual” on a single smartphone screen, making it easier to notice subtle tilts or equipment misplacements.

Furthermore, digital records using AR and positioning information refine history management. Photos and records taken during inspections are always linked with accurate positioning coordinates and timestamps, so simply accumulating data creates an “electronic medical record” for each pole. If images taken from the same point and angle every time are overlaid, inspectors can review the trajectory of condition changes—such as progress of tilt or expansion of deterioration—as if being tracked by a fixed camera. Accumulated data can be managed on a map, enabling bird’s-eye analyses like “which areas have a high incidence of faults,” which assists planning for preventive maintenance.

How to integrate AR into the inspection workflow

How can AR × high-precision positioning be integrated into an actual pole inspection workflow? Below is a step-by-step image of practical use.

1. Pre-preparation of design data and inspection information: First, digitize pole design drawings, GIS location information, past inspection history, and import them into a dedicated AR app. If drawings are in DXF/DWG format, prepare them so they can be read into the app and displayed according to the site. Link inspection checklists and past photos and synchronize them to smartphones via the cloud. This ensures that when the smartphone is launched on site, all necessary information is available at hand.

2. High-precision positioning alignment on site: Upon arrival at the inspection site, power on the RTK-GNSS receiver attached to the smartphone. Within tens of seconds the receiver gets correction signals from satellites and the current location reaches a Fix state. No special equipment setup or tedious calibration is required. The smartphone screen shows your position and heading on a map, and alignment with an error of only a few centimeters (a few in) is completed. With this in place, simply pointing the camera is enough to have AR information accurately overlaid on the real object.

3. Comparison with design (overlaying): Before inspection, display planned positions and structural models from the design stage in AR in the real space and check for discrepancies with current conditions. For example, verify on AR whether the pole’s installed position deviates from the design drawing or whether the tilt angle is within acceptable limits. High-precision AR projection allows on-site consideration of corrections without overlooking position shifts at the centimeter level (inch-level). Also compare the heights and mounting positions of attached equipment with those listed in the drawings, and record any issues. This verification against design information enables early detection of construction errors or post-installation displacement.

4. Conducting inspections using AR: Next, proceed with the actual inspection tasks. The smartphone screen displays inspection points and items in sequence, guiding the inspector to check the pole from top to bottom according to the instructions. For example, steps like “check for looseness of guy anchor” or “photograph corrosion at the pole base” appear on the screen to ensure nothing is missed. The inspector follows the prompts and, if an abnormality is found, takes a photo. When a photo is taken with the smartphone, it is automatically tagged with shooting location (latitude/longitude), direction, and timestamp. Notes can be entered on the spot via the smartphone or recorded as voice comments. There is no need to transcribe to paper notebooks; photos and observations are linked and saved to the cloud immediately.

5. Detailed recording with LiDAR scanning: If the smartphone includes a LiDAR sensor (distance-measuring function based on light), more advanced records are possible. When deterioration or structural distortion is of concern, the inspector can scan the area with the smartphone to obtain 3D point cloud data. For example, in cases where the base of a pole has settled and the pole is tilting, performing point cloud measurements that include the surrounding ground position relationship allows accurate analysis of tilt angles and deformation amounts back at the office. Complex shapes and dimensions can be digitally preserved at millimeter level (about 0.04 in), which is powerful for understanding deterioration details that cannot be seen from flat photos alone.

6. Automatic consolidation of inspection results: After completing the inspection, the collected data are automatically organized and aggregated. Photos, notes, and point clouds are all stored linked in the cloud, and an electronic report can be generated with one click from the management interface. Because photos already indicate the shooting location and target part, there is no need for later transcription into reports. Information collected on site is reflected in the digital registry the same day and shared immediately among stakeholders. This enables major efficiency gains both in the field and in office work, removing the burden of post-site material organization and report preparation.

Concrete examples of on-site improvements and key points for introduction

Smart inspections using AR × high-precision positioning bring various practical benefits. Here are some concrete examples of field improvements and key points to keep in mind when introducing the technology.

• Enabling small-team or solo inspections: Thanks to AR-guided work navigation and automatic recording, inspections that traditionally required two-person teams can in some cases be performed safely by a single person. For example, an experienced technician does not always need to be on site; inspection progress by novices can be monitored remotely via the cloud so that advice can be provided as needed. This allows fewer personnel to cover more poles amid labor shortages, reducing dependence on veteran experts and minimizing person-dependent tasks. Consistent quality can be maintained regardless of who performs the inspection, which is beneficial for skills transfer and personnel development.

• Immediate collaboration through cloud sharing: With automatic cloud sharing of inspection data, information flow between field and office is greatly improved. Photos and records taken on site can be checked in the internal system immediately after shooting, so responsible departments can grasp inspection results in real time. If a serious abnormality is found, detailed information uploaded from the field enables the head office to promptly consider countermeasures, establishing a remote support structure. Also, information that tended to be scattered in paper forms is centrally managed in a digital registry, allowing easy tracing of each asset’s history on a map. Accumulated data can be analyzed to identify trends in anomaly occurrences and used in strategic maintenance planning.

• Improved capability at night and in confined spaces: Inspection solutions that require only a smartphone and a compact GNSS receiver are suitable for late-night or early-morning inspections and work in narrow spaces. Even in dark conditions, following AR prompts on the smartphone screen lets inspectors reliably identify inspection points more effectively than reading drawings by flashlight. LiDAR scanning works even at night where light does not reach, enabling recording of object shapes at daytime-equivalent accuracy. Moreover, in narrow alleys or places where vehicles cannot enter due to fallen trees—where conventional surveying equipment and tripods are difficult to set up—positioning and inspection can be completed with a single handheld smartphone, offering significant mobility. Not having to carry heavy equipment reduces burden in sites with poor footing or high-altitude work.

• Smooth introduction and on-site adoption: When introducing new digital technologies to the field, concerns about “whether staff can use it” are common, but AR inspections on smartphones are intuitive and therefore tend to be accepted by field staff. In practice, it is effective to start pilot operations in a limited area or process, progressively expand while organizing data (digitizing asset information and standardizing inspection items), and roll out step by step. It is also important to confirm the reception environment for correction information in advance (communication lines and satellite visibility) so high-precision positioning can be used stably. With cooperation between field and management, starting small and expanding as benefits are experienced helps DX take root naturally.

Closing: The future of pole inspection DX and what LRTK brings

Pole inspection work is on the verge of a dramatic evolution through the fusion of AR and high-precision positioning. Tasks that relied on the intuition of skilled workers are being standardized and made more efficient by digital technologies, reducing human error and easing workload. Overseas, AR support tools are being introduced for maintenance of bridges and plant facilities, and domestically there are moves to utilize drones and AR for transmission line patrols. DX in infrastructure inspection will accelerate further, and the use of such advanced technologies will become the new standard.

Amid this trend, the smartphone-based high-precision AR system “LRTK” is the key to making on-site DX practical and accessible. LRTK brings positioning accuracy and AR capabilities comparable to expensive surveying equipment simply by attaching a compact RTK-GNSS unit to a smartphone. It is designed to be usable without special expertise, and once the device is powered on and positioning is established within tens of seconds, AR-based inspections can begin immediately. It integrates with cloud services to call up design data and inspection history on site and enables one-tap sharing of data acquired locally. In other words, just adding a smartphone to your existing inspection workflow allows anyone to perform advanced digital inspections easily.

DX for pole inspections is not difficult. In fact, if technology is provided in a form that is easy for field workers to use, it will naturally be accepted and spread. The important thing is for the technology to blend in as a “tool that solves on-site problems.” LRTK was developed with precisely that concept, and adoption has already begun among municipalities and infrastructure companies. If you feel even a little pain point in your inspection operations, consider trying this latest technology. Ride the wave of DX coming to the world of pole inspections and seize the chance to dramatically improve on-site safety and productivity. With the high-precision AR enabled by smartphones and LRTK on your side, let’s open a new era of infrastructure inspection.