Should You Hire a Surveying Company for Drone Surveys? 5 Criteria for Choosing a Provider

Among practitioners considering drone surveying, many will feel, now that drone platforms and analysis environments have become more accessible, that "we might be able to do it in-house." Indeed, if you only look at the flow of photographing a site from the air to understand terrain and as-built conditions, the barrier to adoption is lower than before. However, what is required in practice is not simply collecting aerial images. It is important to compile the results into deliverables that can be used on site—with the required accuracy, covering the required extent, and delivered at the required timing.

Therefore, drone surveying should be judged not by whether you can fly it, but by whether it can consistently produce results that meet operational requirements. In particular, when used for construction management, earthwork volume estimation, terrain verification, progress management, or maintenance management, you must consider everything from the flight/photography plan and the approach to aerial control markers, to the handling of coordinates, supplementary surveying, safety management, and the organization of deliverables. If these points remain unclear and you proceed, you may be able to capture images, but the data will not be usable and you will ultimately have to redo the work.

What becomes important is correctly determining when you should engage a surveying company and clarifying the criteria for choosing one if you do. In this article, after outlining the reasons for outsourcing drone surveying to a surveying company, we explain five practical criteria to help you avoid mistakes when selecting a provider.

Table of Contents

• How to decide whether to commission drone surveying to a surveying company

• Benefits of commissioning drone surveying to a surveying company

• Selection criterion 1: Do they have proven experience suited to the site conditions?

• Selection criterion 2: Are the survey plan and safety management explained in concrete detail?

• Selection criterion 3: Can they handle everything through to the desired deliverables consistently?

• Selection criterion 4: Do they take ground surveying and supplementary work into account?

• Selection criterion 5: Is coordination with the site and handling of revisions easy?

• Common pitfalls when commissioning drone surveying

• Summary

How to Decide Whether to Hire a Surveying Company for Drone Surveying

Whether you should outsource drone surveying is not determined solely by whether your company owns aircraft. The first thing to consider is the level of deliverables required for the task. For example, if you only need a rough understanding of the overall site, relatively simple aerial photography may suffice. On the other hand, if the work will be used for as-built verification, earthwork volume calculation, slope geometry assessment, pre- and post-development change detection, or preparing documents for clients or prime contractors, coordinate accuracy and data consistency become important. What is required here is not only imaging technique but also the knowledge and operational procedures necessary to make the work valid as surveying.

Also, drone surveying is a task that is highly affected by site conditions. Locations exposed to wind, areas with many surrounding structures, terrain with large undulations, zones with many trees, places with overhead obstacles, and urban areas requiring consideration for nearby residents — the difficulty varies by site. You cannot operate the drone the same way at every site and obtain the same quality of results. Rather, the more challenging the site, the more experience makes a difference in flight decision-making, setting imaging conditions, and arranging supplementary work.

Furthermore, drone surveying is not finished simply by capturing images. Only after post-processing—point cloud generation, orthomosaic creation, noise filtering, coordinate transformation, cross-section verification, quantity checks, and integration into drawings and reports—does it become usable in operations. If you do not plan for these downstream processes, you can easily end up with data that cannot be used for decision-making or reporting.

In short, the criteria for deciding whether to hire a surveying company are not whether your company has the equipment, but the accuracy requirements, the format of deliverables, the site conditions, the schedule, and the level of accountability. If any of these factors is demanding for a task, it is more worthwhile to hire an external surveying company.

Benefits of Hiring a Survey Company for Drone Surveying

The greatest benefit of hiring a surveying company is not their ability to fly drones, but that they can prepare deliverables in a form that constitutes a proper survey. On site, you must be able to explain to your supervisors, clients, and partner companies why the figures are what they are, what area was covered, and at what point in time the terrain represents. By contracting a surveying company, it becomes easier to clarify the preconditions that lead to those explanations and to ensure consistency of the deliverables.

Another advantage is that it makes it easier to choose methods suited to the site from the planning stage. A large development site and a narrow urban area require different flight plans and safety considerations. Even between a flat fill/embankment area and places where slopes and level changes are continuous, the shooting method and the way of verifying results differ. An experienced surveying company can design not just the aerial capture itself but also the required density, overlap, approach to control points, and the need for additional checks specific to that site. That difference greatly reduces rework in later processes.

Furthermore, it is important that complementary on-the-ground work is anticipated. Drone surveying is not infallible, and areas beneath trees, behind structures, under bridges, in tight spaces, or at abrupt change points can be difficult to capture adequately. If the contractor is inexperienced, there is a risk that unseen parts will be left unseen in the final deliverables. Conversely, a surveying company with strong field experience will determine at an early stage which areas to capture by drone and which to supplement on the ground. As a result, it becomes easier to balance accuracy and practicality.

Additionally, a major advantage is that it can reduce the burden on on-site personnel. When drone surveying is conducted in-house, many processes arise: flight preparation, surrounding-area checks, coordination with stakeholders, conducting the imaging, data verification, analysis, and organizing the deliverables. When carried out alongside routine construction management and coordination tasks, the workload on staff can easily increase. By entrusting the work to a surveying company, the site team can more easily focus on sharing necessary requirements and confirming the deliverables.

Criterion 1 for Choosing a Service Provider: Do they have a track record that matches the site conditions?

When choosing a service provider, the first thing you should check is not simply whether they have experience in drone surveying, but whether they have experience under conditions similar to the sites your company manages. If you leave this unclear, you may end up choosing a provider who, despite having extensive experience, does not match your site.

For example, a company that excels at understanding the topography of development sites and a company that specializes in infrastructure inspection may differ in their preferred shooting conditions and in how they compile deliverables. For slope management, as-built control, earthwork volume estimation, progress recording, verification of confined sites, and creation of records for maintenance management, the points to focus on vary depending on the intended use. If your company needs surveying deliverables that can be used for on-site decision-making rather than merely attractive images, it is important to confirm whether they have experience relevant to that purpose.

When evaluating past performance, the sheer number of projects is not sufficient. You need to verify what kinds of terrain, under what conditions, and what types of deliverables were produced. For example, whether they have experience working in heavily wooded areas, are accustomed to processing data in locations with large elevation differences, or have experience consolidating work in a short time on active construction sites. By checking these specifics, you can see the difference between mere promotional achievements and accomplishments backed by on-site responsiveness.

It is also important that the contractor understands the principles of surveying. Even if they are skilled at operating drones, if their accuracy control and verification procedures required for survey deliverables are weak, the results will be difficult to use in practice. When reviewing their track record, don’t let the conversation focus only on flight operations—check whether they also discuss control points, verification methods, supplemental work, and how they organize and deliver the results. Companies that can speak to these matters are more likely to understand what is required on site.

Selection Criteria for Choosing a Contractor 2: Are the Survey Plan and Safety Management Explanations Specific?

The second criterion is whether the surveying plan and safety management are explained concretely. Because drone surveying is easy to visualize, people tend to focus only on the drone's performance and whether flights are feasible. However, what matters in practice is that it is made clear in advance under what conditions, over what area, with what level of accuracy, and how the data will be acquired.

A reliable contractor can, at the stage of asking about site conditions, concretely explain the flight altitude, flight route, required overlap, methods for ground verification, and policies for handling areas that cannot be photographed. Of course, there are aspects that cannot be determined before on-site confirmation, but companies that can still verbalize which elements are uncertain and what they will look at to make a judgment provide a sense of reassurance. Conversely, if the explanation centers on something like “we’ll know once we try flying,” the quality of the results tends to be left to the site conditions, increasing the risk of needing to redo the work.

A safety-management mindset is also indispensable. Drone surveying requires consideration for nearby people and vehicles, neighboring facilities, and worker movement. Especially on active sites, if flight timing, access restrictions, the need for escorts or guidance, and potential interference with operations are not sorted out, the surveying itself can become a burden on the site. A good service provider does not treat safety as a mere formality; they plan with consideration for how it will affect site operations.

Additionally, it is worth checking whether the decision-making criteria for bad weather or poor shooting conditions are clearly defined. On days with strong winds, unstable lighting conditions, or when the ground surface is difficult to see, forcing a shoot may not lead to good results. A provider who can share in advance how they would consider postponement or mitigation measures in such cases can be said to have a strong commitment to maintaining quality.

Criteria for Choosing a Vendor 3: Can they consistently handle everything through to the desired deliverable?

The third criterion is whether it can consistently handle everything through to the actual deliverable your company truly wants. The deliverable referred to here is not limited to the delivery of image data or point cloud data. What is needed on site is information organized in a form that stakeholders can use immediately.

For example, if the goal is to understand current conditions, clear orthophotos and an overall view of the terrain can be important. If the goal is quantity control, the data needs to be organized in a format that makes it easy to perform change detection and calculate volumes. If the data will be used for construction management, it's important that it be delivered in a format that can be easily reconciled with existing drawings and management documents. If it will be used for maintenance management or internal reporting, the results need to be presented in a way that non-specialists can understand. In short, even with the same drone survey, what should be delivered depends on the intended purpose.

However, if this understanding is misaligned at the commissioning stage, even abundant received data can easily become unusable on site. You may have images that look good but are difficult to use for quantity checks, point clouds that exist but make cross-sectional verification time-consuming, or drawings that are hard to align with coordinates. Therefore, when choosing a service provider, you should not only ask "In what formats can you deliver?" but also check whether they will help you sort out "What will likely be needed for our operations?"

A truly reliable vendor does more than simply accept requests; it can also propose designs for deliverables tailored to the project’s objectives. A company that anticipates how downstream processes will use the outputs—uses that on-site personnel may not have noticed—and compiles them in a form that is neither excessive nor lacking will, as a result, improve the efficiency of the entire operation. The key to successful drone surveying lies not only in the skill of the capture but also in the design of how the deliverables will be used.

Provider Selection Criterion 4: Are They Considering Ground Surveys and Supplementary Work?

The fourth criterion is whether there is an assumption that the work cannot be completed using drones alone. This is extremely important, yet often overlooked. Because of the term "drone surveying," some people assume that photographing from the air will capture all the information they need. In reality, however, how the ground appears and surrounding conditions can result in aspects that drones alone cannot adequately capture.

For example, in areas where trees are densely packed, acquiring ground-surface data becomes difficult, and features such as the shadows of structures, areas along walls, the undersides of bridges, and narrow spaces can be hard to capture from aerial photography alone. Also, if a site has continuous elevation changes or many small points of variation, additional verification may be required depending on the intended later use. In such cases, it is risky to work with a client who insists on relying solely on drones.

A reliable service provider thinks from the outset about which parts should be captured by drone and which should be supplemented on the ground. Companies that are prepared to combine ground surveying and close-range verification as needed produce results that are more practically useful. This does not mean that drone surveying is less capable; rather, it means they have the mindset to use the right tool in the right place. In practice, a company that understands the limitations and can present complementary measures is more trustworthy than one that offers all-purpose assurances.

Also, it's worth checking whether they can clearly explain to the on-site team the need for any supplementary work. Companies that can clearly communicate why that additional work is necessary and which parts contain uncertainty demonstrate a strong sense of responsibility for quality. Conversely, if they make it look as if there are no problems on site but constraints only become apparent after delivery, practical usability will suffer.

Criterion 5 for Choosing a Contractor: Ease of Coordination with the Site and Handling Revisions

The fifth criterion is how easy it is to coordinate with the field and how easy it is to handle revisions after delivery. Drone surveying is not a job that ends once the deliverables have been submitted. As the site progresses, you may want to check from different angles, or you may want to change how quantities are viewed. You may also want to change the presentation to match reporting materials. How flexibly these practical adjustments can be accommodated affects satisfaction.

When selecting a surveying company, the quality of communication is as important as technical capability. Whether they can grasp your objectives and communicate accordingly, whether they can explain things in language that site personnel can understand rather than merely listing technical jargon, and whether they make an effort to understand the background of your requests are all crucial for a long-term relationship. Drone surveying is not a process that will automatically take shape after a single initial briefing. There are many occasions when adjustments are required depending on site conditions and how the equipment will be used.

What I particularly want to confirm is the provider’s attitude toward handling additional questions or minor adjustments that arise after delivery. In practice, it’s often only after the team starts using the delivered work that they notice issues. A company that responds carefully while understanding the background at that point can greatly reduce the operational burden. Conversely, if the provider is completely inflexible after delivery, the on-site team may end up having to handle extra adjustment work.

Ease of on-site attendance and coordination with stakeholders is also important. When adjustments with the site safety officer, construction manager, or partner companies are required, a company that can coordinate efficiently and in an organized way is less likely to disrupt the overall workflow. The quality of drone surveying depends not only on analysis but also on the smoothness of on-site operations on the day. For that reason, collaborative capability should not be overlooked as a selection criterion.

Common Pitfalls When Requesting Drone Surveys

So far we have reviewed the criteria for choosing a service provider, but in the field failures can also occur because of the way requests are made. A common mistake is issuing a request that simply says, "Please measure with a drone." That does not convey why the measurement is needed, what level of accuracy is required, or how the results will be used. Even if the service provider is competent, vague prerequisites make it difficult for them to propose the optimal solution.

For example, whether the objective is assessing current conditions, managing earthwork volumes, or verifying as-built conditions will change the required design. Even though site personnel may have the same sense of "measuring," from the recipient’s perspective the required capture conditions and the way results are organized differ greatly. Before making a request, at a minimum clarify the target area, intended use, required timing, site conditions, and whether the results need to be submitted to anyone; doing so will improve the quality of proposals.

Another common mistake is to treat drone surveying as a cure-all. Being able to grasp wide areas from the air in a short time is a major advantage, but it doesn’t mean you can obtain every piece of information at the same quality on every site. There are conditions it struggles with, such as trees, structures, narrow spaces, occlusions, and fine inspection points. Assuming these limitations and considering alternative methods when necessary will ultimately result in more consistent quality.

Furthermore, postponing confirmation of the deliverables is risky. If you do not share with the contractor what deliverables you will receive and how you will use them before the shoot, differences in understanding will surface at the delivery stage. Pre-aligning on the formats needed for on-site use, the organization required for reporting, and forms that are easy to share internally is essential to preventing failures.

Summary

Whether you should outsource drone surveying to a surveying company should be judged not simply by whether your organization can operate the aircraft in-house, but by whether you can consistently obtain the deliverables required for the work. Even for relatively simple uses such as current-condition checks, specialized measures may be necessary depending on site conditions and downstream processes. All the more so, for tasks that involve accuracy and accountability—such as as-built management, earthwork volume assessment, and incorporation into reporting materials—the importance of choosing a provider with a surveying-oriented approach increases.

When choosing a service provider, it is important to evaluate them against five criteria: whether they have a track record suited to the site conditions, whether their survey plan and safety management explanations are specific, whether they can consistently handle the deliverables you want, whether they take ground surveying and supplementary work into account, and whether coordination with the site and handling of revisions is easy. Simply covering these five points makes it easier to avoid the mistake of selecting a provider based only on superficial appearance.

Furthermore, drone surveying is well suited to efficiently capturing large areas, but on site there are many situations where you need to quickly perform setting out of positions and point checks on the ground as well as aerial measurements. If you take those daily operations into account, it is also important to have a system that allows field personnel to handle high-precision positional information at hand. For example, by utilizing an iPhone-mounted GNSS high-precision positioning device such as LRTK, you can streamline daily inspection tasks and position recording. By appropriately balancing occasions when drone surveying is outsourced and situations where quick on-site positioning is required, you can further improve the overall productivity of surveying operations.