Basics of Drone Surveying to Streamline Solar Power Plant Inspections

In inspections of solar power plants, it is necessary to efficiently check a large site without overlooking many items such as panels, mounting racks, slopes, drainage, access roads, and fences. Traditional inspections done on foot are indispensable, but as the site gets larger travel time increases, and the area that can be inspected tends to vary due to slopes, mud, weeds, and steps. One effective option is to streamline inspections by utilizing drone surveying.

Table of Contents

• Why drone surveying is gaining attention for solar power plant inspections

• Main inspection targets that can be confirmed by drone surveying

• Approach to dividing the roles of on-site surveys and drone surveying

• Basic procedures for conducting drone surveying at solar power plants

• Information to prepare to improve inspection accuracy

• Flight conditions to consider in the aerial photography plan

• How to leverage acquired data in inspection operations

• Common pitfalls that are easy to overlook in drone surveying

• Operational approach to achieve results in ongoing inspections

• To advance the efficiency of inspections for solar power plants

Why drone surveying is gaining attention for inspections of solar power plants

Inspection of a solar power plant is not just about looking at the power-generating equipment itself; it is the task of checking the surrounding environment and the overall condition of the site that affect power generation. There are many items to inspect, such as noticeable dirt on panel surfaces, shading caused by weeds, settlement around mounting racks, poor drainage, deformation of slopes, damage to maintenance roads, and leaning fences. If you try to check all of these solely by human sight and on foot, the larger the site area, the more time it takes, and the inspection quality becomes increasingly dependent on the inspector’s experience and the site conditions.

The reason drone surveying is attracting attention is that it allows an overhead view of an entire power plant, making it easier to confirm spatial relationships and extents that are difficult to grasp through on-site inspections alone. Disturbances in panel rows, connections of drainage routes, slope deformations, and the influence of surrounding trees—features that are hard to see from the ground—can be organized as images or, when necessary, as surveying deliverables. This is especially true for solar power plants installed in mountainous or sloped areas, where walking inspections alone take time and require decisions to avoid approaching hazardous locations. By using drones, you can grasp the overall picture before entering the site and more easily narrow down the locations that need focused inspection.

Another advantage is that inspection results are easier to document and retain as records. On-site photographs have long been used for inspection records, but if camera positions and orientations are not standardized, it becomes difficult to compare them with past records. With drone surveying, by setting similar flight routes, coverage areas, and imaging conditions, it becomes easier to accumulate images and terrain data according to consistent standards. Therefore, it is easier to check changes from the previous inspection, and the data can be readily used as material for decisions such as repairs, weed control, and drainage improvements.

In solar power plants, early detection of signs of abnormal conditions can help suppress generation losses and optimize operation and maintenance costs. For example, continued poor drainage can lead to muddy ground and erosion. If weeds grow, they may cast shadows on panels and reduce the accessibility of inspection paths. Drone surveying is an effective means to regularly capture such changes across the entire site and help inspection personnel prioritize.

However, drone surveying is not infallible. There are items that can only be judged by close ground inspection, such as loose bolts, the internal condition of electrical equipment, minor wiring damage, and the condition inside junction boxes and PCS. Also, visible images alone may not be sufficient to determine electrical abnormalities or overheating of panels. Therefore, it is important to position drone surveying not as a replacement for on-foot inspections but as a method for grasping the overall situation before inspection, identifying hazardous locations, extracting potential anomalies, and improving the efficiency of record-keeping.

Main inspection targets that can be checked by drone surveying

When using drone surveying at solar power plants, you should first clearly define what can be inspected. If you capture images with an unclear purpose, you may end up with many photos but lack the information needed for inspection decisions. Drone surveying excels at providing an overhead overview of large areas to check conditions and understand positional relationships and changes.

A typical subject is the condition of the panel rows. Viewed from above, it becomes easier to check the layout of the panel rows, irregularities in tilt, shadows between rows, areas with noticeable soiling, and the effects of surrounding trees and weeds. Inspecting one row at a time from the ground is suitable for local checks, but it takes time to grasp where problems are concentrated across the entire power plant. Using aerial imagery, you can first identify locations that may have anomalies and then set up a workflow to inspect them in detail on the ground.

Next, what is important is the condition of the area around the mounting structures and the ground. Solar power plants are installed on a variety of terrains, such as developed land, slopes, converted farmland, and former forest land. Over time, rainwater flow, ground subsidence, slope deformation, scouring, and sediment accumulation may occur. If drone surveys can identify terrain irregularities and areas prone to water flow, the locations that need to be checked during ground inspections can be narrowed down.

Drainage facilities are also an important item to check. At solar power plants, it is necessary to continually verify that side ditches, catch basins, drainage channels, culvert outlets, and sedimentation areas are functioning. If drainage becomes stalled, it can lead to muddy areas, sediment runoff, damage to maintenance roads, and scouring around racking foundations. Overhead images from drones make it easier to find terrain where rainwater tends to concentrate, locations where drainage channel blockages are suspected, and traces of sediment runoff.

Drone surveying is also useful for weed management. At solar power plants, weeds that grow can cast shadows on panels and potentially lead to reduced power generation. In addition, if inspection pathways become obstructed, work efficiency decreases and inspections and repairs take longer. Regular aerial imaging makes it easier to understand the extent of weed proliferation and provides the basis for prioritizing weed-control work.

It is also effective for checking fences and perimeter areas. Perimeter fences are important for preventing third‑party intrusion and for equipment maintenance. However, at large power plants, simply walking the perimeter can take a lot of time. Using drones makes it easier to cover wide areas to check for leaning or deformation of the perimeter fence, encroaching nearby trees, inflow of soil, and locations that could become routes for animal intrusion. Of course, final judgment requires on‑site confirmation, but it helps narrow down inspection targets.

In this way, there are many items that can be checked by drone surveying, such as power generation equipment, ground conditions, drainage, vegetation, perimeters, and access roads. The important thing is not to make capturing images an end in itself. By deciding in advance what you want to assess and what changes you want to detect, you can obtain data that is useful for inspections.

Concept for Separating the Roles of On-site Inspections and Drone Surveys

To improve the inspection efficiency of solar power plants, it's important not to treat drone surveying and on-site inspections as opposing methods, but to combine their respective strengths. Drones are suited to efficiently cover wide areas. On the other hand, human on-site inspections excel at close-up verification, tactile checks, listening for sounds, detecting odors, assessing accessibility, and examining equipment details.

An efficient inspection workflow is to first survey the entire site with a drone and then verify priority areas through an on-site field inspection. Instead of having everyone walk across the large site from the start, review aerial images and terrain data to identify locations that are likely to have problems. Then head on the ground to the places that should be checked — under the panels, around mounting-structure foundations, clogged drainage channels, cracks on slopes, damaged fences, and so on. This workflow reduces travel time while concentrating inspection resources on areas that are easy to overlook.

For example, suppose drone aerial photography of an entire power plant reveals that weeds have grown high only around certain rows of panels. In that case, an on-site inspection would focus on that area to check shadowing conditions, the need for weed removal, and whether access paths are secured. As another example, if aerial images show sediment accumulating at the lower part of a slope, the on-site inspection would check for clogged drainage channels or scouring at the upper part of the slope. Drone surveying helps design such inspection routes.

There is also a division of responsibilities in post-inspection reporting. Photographs taken during on-site surveys are well suited to detailed explanations of anomaly locations. In contrast, aerial images captured by drones are well suited to explaining where within the power plant an anomaly is located. By combining both, it becomes easier to share the situation among stakeholders such as managers, contractors, maintenance personnel, and landowners.

Be careful not to determine the cause of an anomaly based solely on drone images. Discoloration or surface irregularities visible from above can be affected by shadows, vegetation, moisture, soil properties, camera angle, and other factors. Even if an anomaly is suspected from images, it is important to perform on-site checks as needed and to isolate the cause. Drone surveying is an entry point for detecting anomalies and provides information to assist decision-making.

In inspection work, division of roles is important for safety as well. For steep slopes, muddy areas, slopes at risk of collapse, and places where animal intrusion is suspected, it is safer to check conditions with a drone first rather than having people approach them directly. If a situation is judged to be dangerous, do not approach forcibly; confirm it only after taking the necessary safety measures. Using drone surveying for pre-inspection safety checks can sometimes reduce the burden on workers.

Basic Procedures for Conducting Drone Surveys at Solar Power Plants

When conducting drone surveying at solar power plants, it is important not to fly immediately upon arriving on site but to proceed in the sequence of defining objectives, preliminary checks, flight planning, safety checks, imaging, data organization, and inspection decisions. By establishing procedures in advance, you can reduce missed captures and inconsistencies in records, and make it easier to apply them to ongoing inspections.

The first thing to do is to clarify the purpose of the inspection. Whether you want to check the panel layout, assess the extent of weed growth, inspect drainage or slope deformations, or verify maintenance roads and fences will determine the flight altitude, camera angle, flight route, and required resolution. If you capture images without deciding on the objectives, you may find that the areas you want to check are not included when you review the images later.

Next, confirm the site conditions and flight rules. Identify in advance the power plant’s site boundaries, surrounding buildings, roads, power lines, trees, communications environment, takeoff and landing locations, restricted-access areas, wind corridors, and the like. Also check whether the airspace of the flight location, flight procedures, movement lines of third parties and vehicles, permission from the site manager, municipal ordinances, or procedures under relevant laws and regulations are required. Even for flights conducted for inspection purposes, safety management and rule confirmation cannot be omitted.

Before flight, set the imaging area and flight route. When capturing the entire power plant uniformly, acquire images with a consistent overlap to create conditions that make them easier to process later into orthophotos and terrain data. For partial inspections, narrow the target area and combine oblique-angle and low-altitude captures. Solar panels are prone to reflections, so pay attention to the time of capture and the position of the sun.

On the day of filming, confirm the aircraft, transmitter, batteries, recording media, auxiliary surveying equipment, site drawings, and inspection checklist items. Select takeoff and landing locations with minimal dust, vegetation, and obstacles where the surrounding area can be secured. During flight, continuously maintain visual observation and monitor the movement of nearby people and vehicles, changes in wind, remaining battery level, and communication status. Even when conducting inspections, safe flight is the top priority.

After capture, organize the data immediately. Recording the date and time of capture, the power plant name, the capture area, flight conditions, the person in charge, the weather, and any special notes makes later comparisons and reporting easier. Manage data such as images, orthoimages, point clouds, and terrain models by establishing rules for folder names and file names. If inspections are conducted multiple times, insufficient data management makes comparisons with past data difficult.

Finally, verify the acquired data according to the inspection items. Rather than simply looking at the images, separate the viewing perspectives for each inspection item, such as panel rows, weeds, drainage, slopes, maintenance roads, fences, perimeter, and the extent of shadowing. Record the locations of any suspected abnormalities and, if necessary, follow up with on-site surveys or repair plans. Drone surveying only proves effective when the data are organized into a form usable for inspection decisions, rather than ending with the capturing of imagery.

Information to Prepare to Improve Inspection Accuracy

Preparing before going to the site is essential to improve the inspection accuracy of drone surveys. By assembling the necessary information in advance, you can reduce gaps in imaging coverage and hesitation when making decisions. At solar power plants, equipment drawings, layout plans, site development drawings, drainage plans, inspection records, repair records, trends in power generation, and past photographs are useful.

What is particularly important is the power plant’s boundaries and equipment layout. You need to understand how far management responsibility extends, which areas have panels installed, and where access roads and drainage channels are located. If you fly while the site boundaries are unclear, you may miss photographing required areas or capture unnecessary areas. If the purpose is to check the perimeter, also confirm the locations of fences, entrances and exits, and the relationship with adjacent properties.

Past inspection records are also useful. If you check in advance the issues noted in the previous inspection, the areas that have been repaired, the zones that required weeding, and the locations where drainage problems occurred, it will become clear which places should be prioritized in this survey. Drone surveying can capture wide areas, but by consciously focusing on priority locations when shooting, you will obtain records that are more useful for practical work.

The trend in power generation is also useful as a reference. If generation has declined from a certain period, multiple factors can be involved, such as weather, seasons, equipment failures, shading, dirt, and weeds. Drone surveys alone cannot determine the cause, but checking the extent of shading, weed overgrowth, noticeable dirt on panel surfaces, and changes in the surrounding environment can help narrow down the cause. If confirmation of electrical abnormalities is required, combine with inspection methods appropriate to the purpose, such as generation data, insulation resistance measurements, I-V curve measurements, and infrared inspections.

Also, it is necessary to prepare safety information for the site. By identifying steep slopes, soft ground, locations where falling rocks may occur, places suspected of wildlife damage, no‑entry zones, and precautions around electrical equipment, you can appropriately determine the order of drone pre‑inspection and on‑the‑ground inspection. Improving inspection efficiency should not come at the expense of safety. Rather, it is important to use drone surveying to avoid approaching hazardous areas unnecessarily.

In the preparation phase, decide in advance what deliverables will be required after the inspection. Whether you need an overall overview image, a location map of anomalies, an understanding of terrain elevation differences, or comparison materials with past images will affect the imaging methods and data processing. If positional accuracy is required as a surveying deliverable, it is advisable to decide beforehand on the equipment to be used, the placement of control points and check points, the coordinate system, and the method for accuracy verification. By determining the deliverables first, the data that must be collected on site also becomes clear.

Flight Conditions to Address in a Shooting Plan

In drone surveys of solar power plants, the flight condition settings have a major impact on inspection results. If parameters such as capture altitude, image overlap, flight speed, shooting angle, time of day, weather, and the sun’s position are not set appropriately, images can become hard to interpret or difficult to use for comparison. It is important to create an imaging plan that matches the inspection purpose.

The imaging altitude depends on what you want to inspect. If you want to grasp the overall layout of the power plant, its perimeter, drainage system, and the general appearance of slopes, an altitude that allows a wide view is effective. Conversely, if you want to check conspicuous dirt on panel surfaces, the fine condition of weeds, or deformations in fences, you need conditions that capture greater detail. However, flying lower is not always better. At low altitudes the coverage becomes narrower, increasing the number of flights and the amount of data. You also need to watch out for obstacles such as support structures, power lines, and trees.

Image overlap is also important. When creating overall images or terrain data afterward, adjacent photos need to have sufficient overlap. If overlap is insufficient, the processing results are more likely to have gaps or distortions. At solar power plants, panels are arranged regularly, so image-processing features can become similar. Therefore, it is important to photograph the ground surface, walkways, areas around mounting racks, and surrounding objects as well, to create conditions that make processing easier.

Pay attention to the time of day when shooting. Solar panels are highly reflective, and depending on the time they can make images overexposed or cast strong shadows. If the goal is to check shadows, you may deliberately choose times when shadows appear, but if you want to inspect terrain and equipment conditions uniformly, you need to take steps to avoid extreme reflections and harsh shadows. Changing the shooting time according to the purpose improves inspection quality.

Weather and wind are also important. Rain, fog, and strong winds can make safe flight and stable filming difficult. Overcast days reduce reflections and can be suitable for inspecting panels and ground surfaces, but in conditions that are too dark images may become unclear. When photographing for inspections, you need to judge not only whether flight is possible but also whether the target you want to check will be easy to see.

At power plants located on slopes, pay attention to elevation differences. Even if you think you are flying at a constant altitude, variations in the distance to the terrain at different locations can cause differences in image resolution and appearance. On slope faces and valley terrain, develop a conservative plan while checking the distance between the aircraft and the ground, obstacles, and changes in wind. When necessary, separating overall shots from partial shots enables inspections to be carried out without undue strain.

When planning imaging, also be mindful of carrying out continuous inspections of the same power plant. If you capture images at different altitudes, angles, and times each time, it becomes difficult to compare them with past records. Standardizing imaging conditions as much as possible and establishing imaging rules for each inspection purpose will make it easier to detect changes.

How to Utilize Acquired Data in Inspection Operations

Data acquired by drone surveying only becomes valuable once it has been organized into a form usable for inspection work. Simply storing captured images makes it time-consuming to find the information you need later and makes sharing with stakeholders difficult. For inspections of solar power plants, it is important to organize by linking images, location information, inspection items, anomaly locations, and response status.

What is most immediately useful is an overall aerial image of the entire power plant. With an overall image, you can grasp at a glance the relative positions of panel rows, maintenance roads, drainage channels, fences, slopes, and the surrounding environment. It also makes it easy to explain the situation to stakeholders who have never been to the site, and is convenient to use as material for inspection reports and repair coordination meetings. When explaining anomalous locations, showing where they are within the whole site reduces misunderstandings.

Next, it can be used to extract potential anomaly locations. While reviewing aerial images, record areas of dense weeds, areas suspected of poor drainage, traces of sediment flow, slope discoloration, misaligned panel rows, abnormalities around the perimeter fence, and so on. If this information is reflected in the on-site inspection route, inspectors can efficiently cover the locations they need to check.

When creating terrain data, it helps check drainage and ground deformation. At solar power plants, slight elevation differences can affect the flow of rainwater. If you can identify areas where water tends to accumulate and where sediment is likely to build up, you can use that information to plan drainage improvements and repairs to maintenance roads. This is especially true on slopes, where continuously monitoring changes in terrain makes it easier to implement early countermeasures. However, when treating the data as survey results, it is important to confirm that the required accuracy is met and to carry out accuracy management appropriate to the intended use.

Comparison with past data is also important. Regularly photographing the same power plant allows you to check the spread of weeds, changes in slope conditions, movement of sediment, and changes in the perimeter. When making comparisons, if imaging conditions differ significantly the appearance will change, so it is preferable to record under as similar conditions as possible. By keeping inspection results in chronological order, decisions about maintenance and management will be based on records rather than intuition.

When using them in reports, don't just attach images; organize the inspection purpose, the date the photos were taken, the area photographed, the findings, and whether any action is required. Even if there are no abnormalities, it is worthwhile to record the inspected area and condition, because when an abnormality occurs, past records from normal conditions provide a comparison. Inspection reports are not only for pointing out problems but also serve as documentation of maintenance history.

Drone survey data is also well suited for internal sharing. Not only field personnel but also management, designers, construction personnel, and maintenance companies can discuss while viewing the same images, making decision-making easier. Site conditions that are hard to convey by phone or in writing become easier to understand with aerial overview images and geotagged records.

Commonly Overlooked Points in Drone Surveying

Drone surveying is an effective way to streamline inspections of solar power plants, but if introduced without understanding the caveats it may not deliver the expected benefits. Particularly easy to overlook are image capture quality, positional accuracy, coordination with on-site verification, data management, safety management, and confirming applicable laws and on-site rules.

Regarding image quality, attention should be paid to reflections and shadows. Solar panels tend to reflect light, so depending on the camera angle and the sun's position their surfaces can become difficult to see. Also, strong shadows cast by rows of panels or nearby trees can make it hard to discern the condition of the ground or weeds. While shadows may be useful to check for certain inspection purposes, they can hinder assessment when you want to grasp the condition of equipment or terrain.

Positional accuracy is also important. Even if you find an anomaly, inspection efficiency won’t improve if you can’t get to that location on site. You need to record the locations found in images by linking them to on-site panel rows, aisles, rack numbers, access roads, drainage facilities, and the like. In particularly large power plants, similar panel rows can continue for long distances, making it easy to confuse locations. In inspection reports, it is important to use descriptions that allow anyone to identify the location on site.

Lack of coordination with on-site inspections is also a common issue. Even if drone imagery suggests an anomaly, ground verification may be necessary to determine the cause and level of urgency. If repair decisions are rushed based only on images, what appears to be a problem might actually be a shadow or temporary wetness. Conversely, damage that looks minor in images can require prompt action when inspected on site. It is important to operate on the premise of combining drone surveying with on-site inspections.

Pay attention to the growing volume of data. Drone surveying generates many images and processing files. If you save them without established organization rules, you will not be able to find the data you need later. Manage items separately—power plant name, capture date, purpose of capture, coverage area, processed data, data for reporting, etc.—and keep them organized so stakeholders can verify them without confusion.

Safety management is also essential. Solar power plants have various hazards, such as electrical equipment, mounting racks, fences, power lines, trees, steep slopes, access roads, workers, and vehicles. When flying drones, ensure that anyone other than authorized personnel does not approach, and clearly define takeoff and landing sites and the flight area. Decide not to fly in strong winds or poor visibility. Do not omit safety checks in favor of inspection efficiency.

Additionally, it is necessary to confirm the rules regarding flight. Depending on the conditions, procedures such as permissions or approvals may be required for operations near airports, in densely populated areas, in airspace above certain altitudes, in airspace reserved for emergency operations, for night flights, for beyond-visual-line-of-sight flights, or for flights where maintaining distance from people or property cannot be ensured. Check not only aviation law but also local ordinances, the rules of facility managers, and considerations for nearby residents and adjacent properties. Because regulations and operational practices may change, it is important to check the latest information before flying.

It is also important not to overtrust the results of drone surveys. There are limits to the information visible from above. The backs of panels, fine details of wiring, the interior of junction boxes, the condition of bolts, equipment overheating, and electrical abnormalities may require other inspection methods or specialist verification. Drone surveying is effective in practice when used with a clear understanding of the role it plays within the overall inspection.

Operational Approach to Achieve Results in Continuous Inspections

To maximize the benefits of drone surveys for solar power plant inspections, it is important not to treat them as a one‑off shoot but to integrate them into continuous inspection operations. A single survey can reveal the condition at that moment, but it is difficult to grasp trends of change. In operations and maintenance, it is essential to understand not only whether anomalies exist, but also whether changes are progressing or remaining stable.

In ongoing inspections, standardizing imaging conditions is effective. If you capture images with the same approximate coverage, the same approximate altitude, and the same approximate angle each time, it becomes easier to compare them with past images. Even if making the conditions exactly identical is difficult, setting basic rules for each inspection purpose makes it easier to maintain the quality of records when the person in charge changes.

Inspection frequency should be determined based on the power plant’s location and risks. In areas where weeds grow easily, on slopes that are prone to rainwater effects, on sites where soil erosion is likely during land development, or where surrounding trees are close by, it is effective to carry out inspections timed to periods when changes are likely to occur. After typhoons, heavy rain, or strong winds, conducting drone surveys to check the perimeter, slopes, drainage, panel rows, and access roads makes it easier to quickly determine whether damage has occurred.

Accumulating records is also important. By keeping images and reports for each inspection, you can use them as a maintenance and management history for the power plant. For example, if you check the extent of weed growth at the same time each year, you can use that information to review the timing and scope of weeding. If you identify locations where poor drainage repeatedly occurs, you can consider not only partial cleaning but also revising the drainage plan itself.

In ongoing inspections, we also track the status of responses to anomalous locations. For anomaly candidates identified by drone surveys, we record whether they were verified on site, repaired, or set for follow-up observation. At the next inspection, we check whether those locations have improved or the issues have recurred. Establishing this flow makes inspections not merely a record-keeping task but an improvement cycle for maintenance management.

How information is shared among team members also requires careful planning. Although drone survey data are visually easy to understand, they contain a large volume of data, so if only the necessary information is not organized and shared, oversights can occur. For reports, clearly summarize the overall map, locations of anomalies, on-site photos, and the response plan. Store detailed data so it can be checked as needed, and in daily meetings share mainly the information necessary for decision-making.

Thus, to achieve results from continuous inspections, it is important to establish a workflow of image capture, verification, reporting, response, and re-verification. Drone surveying does not make inspections more efficient simply by being introduced. By creating operational rules, combining them with on-site checks, and comparing with past data, you can improve the quality of power plant management.

To Improve the Efficiency of Inspections at Solar Power Plants

In inspections of solar power plants, it is important to efficiently survey large sites while quickly detecting changes that affect power generation and safety. Drone surveying is an effective means for that purpose. By capturing the entire site from above, it becomes easier to check the condition of panel rows, weeds, drainage, slopes, access roads, fences, and the surrounding environment. In addition, keeping the acquired images and terrain data as records allows for comparisons with the past and for explaining conditions to stakeholders.

However, drone surveying is not sufficient if you only capture images. You must clarify the inspection objectives, confirm site conditions and flight rules, develop an appropriate flight plan, and organize the acquired data according to the inspection items. In addition, anomaly candidates identified by the drone should be verified by on-site ground inspections as necessary. By combining an aerial overview with close-up ground checks, you can achieve both inspection efficiency and reliability of judgment.

In solar power plants, conditions such as weeds, drainage, slopes, the site perimeter, and access roads change over time. Therefore, drone surveying is effective not only as a one-off inspection but when incorporated into ongoing maintenance. By standardizing imaging conditions and data-management rules and keeping records that can be compared periodically, early detection of anomalies and improved accuracy in repair decision-making can be achieved.

Practitioners aiming to streamline solar power plant inspections should first identify which parts of their inspection operations consume the most time and which information is frequently lacking. Even simply separating the items to be checked during on-foot inspections from those that should be identified first via drone surveys will make inspection planning easier to improve.

If you want to gain an overall understanding of a large power plant, check slopes and embankments, manage weeds and drainage, and streamline inspection records, an operational design based on drone surveying is effective. By acquiring survey data that are easy to use on site and establishing systems to apply them to inspection and maintenance, the management of solar power plants becomes more practical and reproducible. Before relying on specific equipment or services, it is important to clarify your objectives, required accuracy, safety conditions, and operational framework, and choose a method that fits your company's site conditions.