Four Ways to Organize and Explain Solar Power Plant Survey Results to Clients

In the planning, design, construction, and maintenance of solar power plants, simply submitting survey deliverables is not always sufficient to convey the necessary information. In particular, point cloud data, orthophotos, terrain models, and as-built verification documents produced by drone surveys contain a large amount of information, making it easy for the client to be unsure where to look. What matters to site personnel is not presenting specialized deliverables as-is, but organizing and explaining them in a way that makes decision-making easy for the client.

This article explains four methods of organizing survey deliverables for solar power plants that are useful when explaining them to clients, presented in line with the practical workflow.

Table of Contents

• The perspectives to align first when presenting results

• Explain the purpose and prerequisites of the survey in a single, continuous flow on one sheet.

• Align drawings, on-site photographs, and point clouds to the same viewpoint.

• First, present the differences and risks necessary for making a decision.

• Organize the materials into a document structure so we can proceed to the next steps

• Summary

Key perspectives to align first when presenting results

When explaining survey deliverables for a solar power plant to a client, the first thing to keep in mind is that what the client wants to know and what the surveyor wants to explain are not necessarily the same. Surveyors tend to want to go into detail about the flight plan, control points, imaging conditions, point cloud processing, coordinate systems, and accuracy verification. What clients usually want to confirm first, however, is whether they can use the deliverables to make decisions about planning, construction, and operations.

For example, at a prospective development site, concerns include site elevation differences, anticipated earthwork volumes, drainage direction, how the site interfaces with surrounding roads, and the effects of existing structures and vegetation. During construction, important checks are whether the prepared surface is close to the design intent, whether the placement of mounting frames and access walkways is obstructed, and whether there are any abnormal changes on slopes or around drainage facilities. Around completion and during operation and maintenance, inspection targets include locations where settlement is suspected, scouring, sediment movement, vegetation overgrowth, and deformations or other abnormalities around equipment.

Therefore, at the beginning of the explanatory materials, it is important to clarify what decisions this survey is intended to inform, rather than focusing on the detailed specifications of the survey results themselves. In drone surveys of solar power plants, while it is easy to efficiently grasp a wide area from the air, the acquired data include areas that are visible and areas that are not. Ground surfaces that can be photographed from above—graded surfaces, access roads, drainage channels, slope faces, and the appearance of panel layouts—are relatively easy to organize. On the other hand, it is not appropriate to determine, based solely on drone surveys, buried underground objects, ground surfaces hidden by vegetation or structures, the interior condition of equipment, or detailed structural strength.

If you clarify what is visible and what is not before explaining, you can reduce misunderstandings with the client. Survey results are useful for decision-making, but they are not conclusive in every respect. When explaining the results, you need to separate and communicate what has been confirmed, what can be inferred, and what requires a separate on-site check. If this delineation remains unclear, the client may overestimate the results or, conversely, not know where they can be applied.

Also, at solar power plants, the perspectives that stakeholders emphasize differ. The client-side representative looks at the overall project's risks and schedule. Design personnel check the consistency of terrain, drainage, and layout. Construction personnel check whether machines and people can actually operate and whether there are causes for rework. Operations and maintenance personnel prioritize ease of inspection and early detection of abnormalities. When explaining survey results, it is important to be aware of who will use the materials and what they will decide, and to present explanations that lead to decision-making rather than mere data descriptions.

Explain the purpose and prerequisites of the survey in a single flow

The first method of organization is to summarize the purpose and assumptions of the survey up front. The deliverables from a solar power plant survey can be difficult for the client to interpret if they consist only of terrain data and imagery. If it is not clear why that area was surveyed, what point in time the conditions were recorded, and what accuracy and level of detail the materials are intended to represent, there is no consistent way to view the results.

In explanatory materials, first clarify the purpose of the survey. Whether it is to confirm the current conditions of a potential development site, to examine an earthwork or development plan, to compare before and after construction, to assess conditions after a disaster, or to keep regular records for maintenance, the points to focus on will differ. Even with the same orthophotos or point cloud data, the order of explanation changes depending on the purpose. Presenting the purpose upfront makes it easier for the client to understand the highlights of the deliverables.

Next, clarify the scope of the subject. For a solar power plant, there are multiple locations to check, not only the entire site but also the developed/graded areas, planned panel installation zones, around substation equipment, access/maintenance roads, drainage channels, slopes, and areas near boundaries with adjacent land. When explaining, rather than describing the scope only in words, it is easier to understand if you show on an overall map how far the current deliverables cover. In particular, roads and waterways outside the site and interfaces with adjacent land can affect business decisions, so it is advisable to explain separately whether these were included in the surveying scope or were only checked for reference.

Survey date and on-site conditions are also important. The appearance of a solar power plant site can change depending on the season, weather, vegetation condition, and progress of land development. When grass is tall, the ground surface may be difficult to see, and immediately after rainfall puddles and flow paths may be easier to identify while showing conditions different from normal. If construction is underway, temporary stored materials, heavy machinery, and unconstructed areas can also have an impact. When presenting results, briefly indicate the survey date, weather, site conditions, and construction stage to make clear at what point in time the results were recorded.

Even for coordinate systems and reference points, you need to avoid using too many technical terms when addressing the client. Of course, how coordinates are handled is very important for cross-checking with design drawings and construction management. However, when explaining to the client, it is important to first convey whether it has been organized so it can be checked by overlaying it with the design drawings, whether positioning is aligned using on-site reference points, and whether there are parts that should be treated as reference drawings. Summarize detailed surveying specifications in separate sheets or supplementary materials, and in the main part of the meeting focus on the key points necessary for decision-making so that explanations proceed smoothly.

Even when explaining accuracy, definitive expressions should be avoided. The reliability of drone surveying results varies depending on shooting conditions, ground surface conditions, the arrangement of control points, processing methods, and verification methods. Therefore, rather than saying "it is always accurate," it is more practical to convey something like, "For the purposes of this project, we have organized the scope that needs to be checked and the way of thinking about accuracy as follows." Clients want to know to what extent survey results can be used for design changes, quantity calculations, construction decisions, and maintenance records, so explaining how the results should be treated for each use will make them easier to accept.

By organizing the purpose, scope, survey date, site conditions, coordinate handling, and accuracy considerations into a single flow like this, the subsequent detailed explanations become easier to understand. If the assumptions are aligned in the initial explanation, the client will have criteria for evaluating the deliverables. Conversely, if the assumptions remain ambiguous and point clouds or drawings are presented, follow-up checks such as "Is this area included?", "Is this elevation acceptable compared to the design?", and "Is this change truly a field change?" will increase, making explanations unnecessarily roundabout.

Align drawings, site photos, and point clouds to the same viewpoint

The second method of organization is to link and explain drawings, site photographs, and point cloud data from the same viewpoint rather than showing them separately. In drone surveys of solar power plants, multiple deliverables are produced, such as orthophotos, point clouds, three-dimensional models, cross-sections, contour lines, and materials for verifying areas and distances. Simply lining these up as documents makes it difficult for the client to understand which deliverable shows what.

A clear explanation for the client is one that links the on-site location with the meaning of the deliverables. For example, when explaining the slope of a maintenance road, first show the road’s location on an overall map, then use an ortho image to show the actual ground and surrounding conditions, and finally explain changes in elevation with point clouds or cross-sections. In this order, the client can sequentially understand “which location is being discussed,” “how it appears on site,” and “what the survey results reveal.”

In solar power plants, similar terrain and facilities can repeat across a large site. Because panel rows, access paths, drainage channels, slopes, retention ponds, and surrounding roads appear repeatedly, it can become difficult to understand their positional relationships. Therefore, it is effective to standardize area names and reference numbers in explanatory materials. For example, using consistent labels throughout the documents—such as north slope, east drainage channel, central access path, around the substation, and near the entrance road—makes conversation during meetings easier.

When explaining point cloud data, it's important not to rely too much on visual impact. Point clouds are effective for understanding the three-dimensional form of a site, but if the client is not familiar with how to read point clouds, they may not know which colors, heights, or densities to pay attention to. In presentations, it's a good approach to first indicate the locations to be checked on drawings or images before showing the point cloud itself, and then use the point cloud to confirm the height, slope, irregularities, and interfaces of those locations.

Also, correlating with on-site photographs is important. Drone survey results are centered on an aerial perspective, but the client may also want to know the situation from a ground-level viewpoint. In particular, drainage channel blockages, the surface condition of slopes, level differences with roads, conditions around fences, and the interfaces with existing structures can be difficult to assess from aerial images alone. Therefore, combine ground photos and field notes as necessary and organize them so that the same location can be reviewed from aerial, plan, cross-section, and ground viewpoints.

When presenting results, attention should be paid to the sense of scale in the drawings. If the entire solar power plant site is shown on a single sheet, small elevation differences, drainage flows, and local irregularities become difficult to see. Conversely, if only enlarged detail views are shown, it becomes unclear where on the overall site the problem is located. Structuring the presentation to move from an overall plan to detail views, and from detail views to cross-sections or photographs, enables the client to follow the content without confusion.

In explanatory materials, when indicating the same location across multiple deliverables, it is important to ensure that the name, number, orientation, and extent do not diverge. If a drawing labels it as "Point A", a photo as "Inspection Location 1", and the point cloud uses a survey point number, the client will spend time reconciling them. Standardizing location numbers and area names during the preparation of materials will increase the credibility of the results during presentations.

Also, when explaining the overlay of drawings and survey results, you need to convey not only the overlaid outcome but also the assumptions behind the overlay. Design drawings, current-condition surveys, post-construction surveys, and past survey data may differ in their creation dates and reference systems. To avoid misunderstanding whether a discrepancy is due to an actual change on site or a difference in data references, it is important to clearly state the timing of the compared data and how they were treated.

The purpose of this organizational method is to enable the client to visualize the site while reviewing the deliverables. Survey deliverables can appear abstract to those unfamiliar with the site. By linking drawings, images, point clouds, cross sections, and photographs from the same viewpoint, the client can more easily understand "what is happening at this location" and "to what extent things have been verified."

Present the differences and risks necessary for decision-making first

The third way to organize is to first present the differences and risks necessary for the client's decision-making. Survey deliverables contain a lot of information, but the client does not need the details of every point or image. What is important is where the differences that affect planning, design, construction, and maintenance are, and how they will lead to decisions.

In solar power plants, differences in topography can affect drainage plans and site formation plans. If the slopes within the site differ from what was assumed, the flow of rainwater may change. If there are locally low spots around access paths or mounting racks, they can lead to puddling or muddy conditions. If the shape of slopes or embankments has changed, it may be necessary to check surface water runoff and soil movement. These points need to be organized as matters for the client to decide, not merely as survey measurements.

When explaining differences, make clear what is being compared. The meaning changes depending on whether the difference is from the design drawings, from the previous survey, between before and after construction, or between before and after a disaster. For example, even if a location appears to have changed in elevation since the previous survey, it is necessary to distinguish whether that change is a planned alteration due to construction, a change caused by rainwater or sediment movement, or simply a difference in appearance due to different data acquisition conditions. In explanations, it is important not only to state that a difference exists, but also to provide the assumptions needed to interpret that difference.

Care is also needed in how risks are presented. When explaining to the client, there is no need to unduly alarm them, but it is also inappropriate to leave areas that require verification vague. For example, rather than asserting "This is dangerous," use expressions such as "This location is lower than the surrounding area and requires checking for ponding during rainfall" or "Because changes in the surface shape near this slope have been observed since the last inspection, an on-site inspection and confirmation of drainage conditions are advisable," which will prompt further action.

In survey results for solar power plants, alignment of drainage, slopes, roads, boundaries, equipment foundations, and developed surfaces is particularly likely to be addressed. Regarding drainage, confirm where rainwater will flow, whether there are topographic depressions that tend to retain water, and whether there are locations where sediment accumulation in drainage channels or side ditches is suspected. For slopes, rather than determining susceptibility to failure based solely on survey results, it is necessary to organize the information to guide on-site verification of geometry changes, signs of erosion or scouring, surface water flow, and vegetation condition. For roads, document the gradients, widths, level differences, and areas prone to becoming muddy for access roads and maintenance tracks. Near boundaries, check height differences with adjacent land, water flow, and the positions of features that could be mistaken for encroachment.

When documenting differences, it is effective to arrange the order of explanations for each inspection point so that the client can more easily judge their importance. First, indicate where the inspection points are within the whole; next, show what they are being compared to; then explain the expected impacts and the recommended next checks. By following this flow, the client receives the survey results as material for decision-making rather than as mere remarks.

Also, areas where no changes are observed have explanatory value. The client may want to know not only the locations with problems but also those progressing according to plan or those showing no significant change at this time. Especially in reports during construction or maintenance, listing only problem areas can make the overall situation appear worse than it actually is. Within the inspected scope, dividing descriptions into areas with little change, areas to continue monitoring at the next inspection, and areas that require additional checks now will make the report more balanced.

At the same time, it is important to explicitly state what cannot be determined from the survey results. The ground beneath vegetation, the backsides of structures, underground buried objects, the interiors of equipment, and the condition of material deterioration are examples of things that may not be adequately assessed by drone surveys alone. To preserve the reliability of the results, communicate to the client the distinction between "areas that can be confirmed with the current results" and "areas that require on-site inspection or confirmation by other methods."

Organizing the presentation by showing differences and risks first also helps make the client's meeting time more effective. Rather than explaining a large number of deliverables in sequence, sharing the items that require decisions up front and then presenting the survey results as the basis for those decisions makes the discussion more concrete. Survey results are both the main focus of the explanation and the supporting evidence for decision-making. Being mindful of this positioning makes the materials more effective in communicating with the client.

Organize the materials into a structure that enables the next steps

The fourth way of organizing is to structure the materials so that the client who heard the explanation can proceed to the next steps. Explaining surveying results does not end with reporting them. The client will, based on that content, request confirmation from the design team, consult with the contractor, decide whether additional surveys are needed, and reflect the results in maintenance plans. Therefore, the explanatory materials need to be not only understandable during meetings but also easy to use afterward.

First, placing an overall summary at the beginning of the document is effective. In the summary, briefly outline the purpose of this survey, the scope covered, the main findings, any areas that require additional verification, and the proposed next actions. Even for long explanatory documents, if the key points for decision-making are summarized up front, the client can more easily grasp the overall picture. In particular, when the document is used for internal sharing or reporting to superiors, the presence or absence of a summary affects the document’s usability.

Next, organize the detailed materials by inspection point. For each inspection point, list the location, on-site conditions, survey results, decision points, and next items to be checked in the same order so the reader will not be confused. For example, for a slope inspection point follow this flow: overall location, enlarged images, verification of cross-sections and heights, anticipated points of caution, and a proposal for on-site verification. If you use the same structure for drainage channel inspection points, the client will immediately understand how to read the materials.

When presenting materials, you don't need to avoid technical terms excessively, but it's important to ensure that their meanings are conveyed. Terms such as point clouds, orthoimages, cross-sections, elevation differences, control points, and coordinate systems are necessary in practical work. However, continuing to use them without explanation can place a burden on clients who are not familiar with surveying. Provide a brief explanation at the outset, and then use the same terms consistently so that the entire document is easier to read.

You should also organize the submission formats for survey deliverables. Explanatory materials for the client to review, drawing documents to be referenced in design and construction, raw data for later re-analysis, and photos and forms kept as records all serve different purposes. If you cram everything into the same document it becomes difficult to use, so it is best to separate them into viewing, verification, and archival categories. When explaining to the client, saying "We will use this summary document in meetings and refer to the attached drawings and data for detailed checks" will clarify the role of each material.

In drone surveying deliverables for solar power plants, time-series management is also important. When data are accumulated from before development, before site preparation, during construction, at completion, and during operation and maintenance, it becomes easier to track changes at the same location. When explaining to the client, clarifying whether the current deliverable is a one-off document or a baseline for future comparison will convey the importance of storage and updates. In particular, because comparisons with past data are effective for post-disaster inspections and checking terrain changes, including an explanation of the data management method will be useful in practice.

To make materials usable for the next steps, it's important not to leave confirmation items ambiguous. Documents that simply state "Requires confirmation" do not make it clear who should confirm what. For example, use wording that specifies the next actions, such as "Confirm on site the flow status of the drainage channels", "Compare the design drawings with the elevations of the finished ground", "Discuss with the contractor how to handle the access-route gradients", and "Verify the same locations as comparison points during the next survey".

When explaining to the client, it is also important not to rush to a conclusion. By separating and explaining the facts visible from the survey results, the possibilities that can be inferred from them, matters that require additional verification, and the options for decision-making, the client can make a considered judgment. In particular, for issues such as possible topographical changes, poor drainage, and deformations around slopes, it is appropriate to explain them in a way that leads to on-site verification and consultation with stakeholders rather than definitively attributing causes or countermeasures based solely on the survey results.

At the end of the documentation, it is good to summarize the potential uses of the results obtained. Clarifying which purposes they can be used for—such as design review, construction planning, as-built verification, maintenance, comparative materials for post-disaster analysis, and internal reporting to the client—makes it easier to communicate the value of the survey results. Rather than a report that simply says "we measured it," present it in the form "these results enable the following decisions"; by doing so, the material becomes a practical resource for the client.

Summary

When explaining the surveying results of a solar power plant to a client, it's important not only to consider the quantity and appearance of the deliverables but also whether they are organized in a way that makes it easy for the client to make decisions. Even if drone surveying makes it easier to grasp the condition of a large site, simply handing that information over as-is can make it difficult to translate into decisions for planning, construction, and maintenance.

First, organize the survey objectives and assumptions, and clarify what decisions this deliverable is intended to inform. Next, link drawings, site photographs, point clouds, and cross sections from the same perspective, structuring the material so the client can understand it while visualizing the site. On that basis, present up front the discrepancies and risks that affect design, construction, and maintenance, and finally arrange the documentation to lead to the next actions.

At solar power plants the sites are large, and many factors are involved, such as topography, drainage, slopes, access routes, equipment layout, and the surrounding environment. When explaining to the client, you need not only to present survey results as technical data but also to translate them into information for decision-making. If you separate and communicate what has been confirmed, what remains an estimate, and what requires additional verification, the reliability of the survey results will increase and misunderstandings among stakeholders can be reduced.

To leverage drone survey results in client briefings, it is essential to create a workflow that clearly records site conditions, manages them so they are easy to compare, and leads to subsequent decisions. If you want to use survey results across a series of tasks—from understanding the current condition of a solar power plant, construction verification, and maintenance management to post-disaster inspections—it is important to organize the purpose, survey scope, approach to accuracy, and areas that cannot be confirmed, and compile them into explanatory materials that make it easy for the client to make decisions.