Can drone surveying be used on small-scale sites? Four criteria to decide

Table of Contents

• Why Drone Surveying Is Attracting Attention Even on Small-Scale Sites

• Characteristics of small-scale sites suitable for drone surveying

• Four criteria to determine whether it can be used on small-scale sites

• Benefits of introducing drone surveying at small-scale sites

• Points to note before implementation at small-scale sites

• Cases Where Drone Surveying Is Unsuitable

• How to Proceed Without Failing on Small-Scale Sites

• Summary

Why Drone Surveying Is Gaining Attention Even on Small-Scale Sites

When people think of drone surveying, many imagine a technique aimed at vast development sites or large-scale infrastructure projects. It is true that being able to measure wide areas in a short time is one of drone surveying’s characteristic strengths. However, in practice, whether to adopt it is not decided solely by the size of the area. Depending on site conditions and objectives, it can be effectively used even on small sites.

In fact, in recent years, because there is a need to operate sites with limited personnel, the importance of shortening construction schedules and preventing rework has increased, and the demand to retain pre- and post-construction records as data has grown, more companies are considering drone surveying even at small-scale sites. In particular, sites where a rapid assessment of current conditions is needed, sites that include hard-to-access areas, and sites where earthwork quantity checks and as-built verification need to be made more efficient are increasingly likely to realize the value of introduction regardless of their size.

On the other hand, precisely because a site is small, doubts such as "Is it really necessary?", "Wouldn't it be faster to measure by hand?", and "Wouldn't preparing to fly be more trouble?" tend to arise. On small-scale sites, the deciding factors are less the area to be measured itself than conditions such as the surrounding environment, the deliverables you want to obtain, the required accuracy, and the personnel and time available at the site. In other words, whether to use drone surveying at a small-scale site should not be decided solely by whether it is large or small.

This article organizes a framework for practitioners researching drone surveying to determine whether it can be used on small-scale sites. Centered on four key decision criteria, it offers clear, practical explanations of the types of sites that are suitable, those that are not, and the considerations to keep in mind when implementing it. Rather than dismissing small-scale sites as infeasible, use this as a basis to judge which conditions make drone surveying effective and which conditions make alternative methods more reasonable.

Characteristics of small-scale sites suitable for drone surveying

Even among small-scale sites, the work involved varies widely. Residential land development, exterior works, slope repairs, temporary works planning, improvements to narrow roads, partial construction related to equipment upgrades, and on-site maintenance — even when the scale is the same, the site’s shape and purpose can differ greatly. For that reason, suitability cannot be judged by area alone.

A representative example of small-scale sites suited to drone surveying is a site where you want to capture terrain and elevation differences across an area. For example, at sites with partial cut-and-fill, it is easier to understand the situation by surveying the entire surface rather than by taking point measurements. In particular, when you want to see the differences between the current conditions and the plan, or compare changes before and after construction, recording the area as a surface with a drone will prove useful in later stages.

Furthermore, sites that include areas difficult for people to access are also suitable. When footing is poor, the ground is muddy, there are slopes, heavy machinery is operating, or there are many obstacles—situations in which walking to take detailed measurements is burdensome or hazardous—the value of efficiently acquiring data from the air increases. On small sites, where personnel are often limited, advantages in both safety and labor savings are easier to realize.

Furthermore, it is well suited to sites where photographic records alone are insufficient and where you may want to verify dimensions and shapes later. Even if construction photos remain, it is not uncommon that the extent or height relationships cannot be accurately traced afterward. If you preserve drone survey data in forms such as orthophotos and point clouds, it becomes easier to review the situation even after the site work is finished. This is extremely useful for client explanations, internal sharing, coordination with design, and responding to changes.

On the other hand, in cases where you simply want to check a few points on a small, flat area, the advantages of drones may be hard to realize. In other words, whether drone surveying is suitable for a small-scale site should be considered not in terms of narrowness but from the perspective of whether you need to capture information across an area, whether it can reduce risk or effort, and whether the data will be used in subsequent processes.

Four Criteria to Determine Whether It Can Be Used at Small-Scale Sites

Decision criterion 1: Is the deliverable you want surface data or point data?

The first thing to sort out is what deliverables are truly required on site. If you consider implementation while that remains unclear, it will become difficult to use even at sites where it could otherwise be useful. Drone surveying offers high value on small-scale sites when you want to understand the site as an area.

For example, if your objective is to update a current site map of the entire property, to view terrain differences before and after construction, to check the volume of fills and excavations, or to share an overall view of the site among stakeholders, drone surveying is a strong option. Conversely, if you only need to verify a few points near the boundary with high precision, to pinpoint equipment installation positions, or to record the elevations of just a few specific points, ground-based measurements can often be faster and more practical.

On smaller sites, if you start simply because it seems convenient to capture from above, expectations and results tend to diverge. The important thing is to clearly distinguish whether you want to be able to review the overall shape of the site afterward, or whether you only need the values at specific points. If it’s the former, drone surveying is a good match; if it’s the latter, there are situations where it’s better to base your approach on a different method.

In practice, if you make the wrong decision you often end up in a situation where, despite having flown the drone, you still haven't obtained the information you needed. Because smaller sites have limited time available for setup, it’s essential to start from the deliverable. Simply deciding up front whether you need photos, orthophotos, point clouds, earth-volume comparisons, or as-built verification makes it much easier to determine whether drone surveying is appropriate.

Evaluation Criterion 2: Is it an environment where filming from the air can be conducted safely and efficiently?

The next important factor is the flight and imaging environment around the site. Small-scale sites are often adjacent to urban areas or existing facilities, and in some cases the surrounding conditions can be more restrictive than at larger sites. Drone surveying is not something that can be achieved by aircraft performance alone; its feasibility is determined by whether there is space where it can be flown safely.

For example, at sites where power lines, trees, or buildings are close by, aerial flight routes are restricted. The smaller the site, the less room there is for takeoff and landing, and an impractical flight plan becomes a factor that reduces safety. Also, in environments that require consideration for nearby pedestrians, vehicles, and neighboring residences, operational planning can be more difficult than the flight itself. On small sites, even if the area to be measured is narrow, the area that must be watched over can be wide.

What should be judged by this criterion is not the size of the area but whether flight paths can be secured, visibility ensured, obstacles are present or absent, safety during operations can be maintained, and impacts on the surroundings can be controlled. Even if the site is small, it is easier to carry out if the surroundings are open and easy to manage; conversely, even if there is a certain amount of space, it can be difficult to carry out if obstacles are densely concentrated.

In addition, the effects of weather and lighting conditions cannot be overlooked. Strong winds, the way shadows fall, surface reflections, puddles, and monotonous surfaces can affect data quality and operability. At small sites people tend to think "it's fine because it will be finished quickly," but even on a short job poor conditions can leave the risk of having to re-shoot. It is important to check both whether it is safe to fly and whether you can achieve the required quality.

Criterion 3: Can efficiency be improved, including preparation and post-processing, compared to on-site work?

What is most easily misunderstood on small-scale sites is judging efficiency solely by on-site flight time. Even if drone surveying on-site acquisition is fast, true efficiency will not be apparent unless you take into account flight preparation, control point setup and reference verification, data organization, analysis, and production of deliverables.

For example, if a site is very confined, flat, and requires only a few verification points, it can be faster overall for someone to measure directly on site. Conversely, if you want to minimize on-site work, keep records so you can recheck on another day, or share the same information with multiple stakeholders, drone surveying can be more efficient overall even if some post-processing is required.

What should be considered here is not just the speed of a single measurement. You need to make a decision that includes data reuse: whether you plan to take multiple measurements before and after construction, whether the site undergoes frequent changes, whether the data will be used in reports or explanatory materials, or whether other personnel might need to verify it later. Because labor per job tends to be tighter on smaller sites, even if the first time takes a bit more effort, the benefits of adopting it are sufficient if that effort can be recovered through subsequent checks and sharing.

In other words, whether drone surveying is effective on small sites should be judged not by shorter flight times but by the total labor required, combining field work and office processing. Even if you save 30 minutes on site, it’s not worthwhile if the office work takes several times as long. Conversely, if the data collected on site can be leveraged across internal sharing, design verification, schedule checks, and record keeping, it can be meaningful even for small-scale projects.

Criterion 4: Do the required accuracy and site conditions match?

Finally, be sure to confirm whether the required accuracy matches the measurement conditions that can be achieved on site. Drone surveying is a convenient technique, but it does not deliver the same quality of results under all conditions. On small sites, conditions that can affect accuracy—such as close to buildings, in tight spaces, or around obstacles—tend to be concentrated; if these are left vague, the outcome can easily fall short of expectations.

For example, if you need an overall understanding, an estimate of earthwork volumes, or before-and-after comparisons of construction, acquiring area-wide data provides great value. On the other hand, when precise positioning to within a few centimeters or fine-grained management that includes areas with poor line of sight is required, complementary ground surveying and securing positional control are essential. It is important to determine at the outset whether drone surveying alone will suffice or whether it should be combined with ground surveying.

Also, accuracy is not determined by equipment alone. Capture conditions, ground surface conditions, the method of establishing control points, surrounding obstructions, flight planning, processing methods, and other factors combine and affect the results. On small sites, people tend to assume "it's easy because it's confined," but in reality they are more susceptible to surrounding influences and can actually be more difficult.

Therefore, the higher the required accuracy at a site, the more necessary it is to determine in advance whether the conditions will allow achieving sufficient quality for the intended purpose. To succeed in drone surveying at small sites, it is important not to treat it as a universal solution, but to adopt a design mindset that determines how much of the required accuracy will be handled by the drone and where complementary methods will provide support.

Benefits of Implementing Drone Surveying at Small-scale Sites

Even on small sites, drone surveying can offer significant benefits when conditions are right. First, it makes it easier to quickly share an overall view of the site. Even if the on-site person can mentally grasp the terrain and the scope of work, that understanding can be hard to convey to other in-house staff, the design team, the client, or partner companies. With data captured from above, it becomes easier to explain the site from a bird's-eye view and reduce gaps in understanding.

Second, it makes it easier to track changes before and after construction. Small sites have short schedules and often require many adjustments, so if records are vague it can be difficult to verify things later. By using drone surveying to capture the current site as an area-wide record, it becomes much easier to compare what has changed and where. This is also effective for preventing rework and for fulfilling accountability.

Third, improved safety. On sites where it is risky for people to walk around closely—slopes, mud, unstable embankments, or around heavy machinery—being able to assess the situation from above alone is valuable. Because smaller sites often operate with fewer personnel, the ability to reduce entry into hazardous areas should not be underestimated.

Fourth, the ease of re-measurement and re-verification. It's not uncommon after on-site work is finished to find yourself thinking, "I wish we'd looked at that from another angle," or "I wish we'd quantified this area as well." If drone surveying preserves a consistent dataset, it broadens what can be reviewed later. This is a major advantage for making effective use of limited site visits at small-scale sites.

As such, drone surveying at small sites offers multiple values beyond simple labor savings: recordability, shareability, safety, and reusability. Rather than deciding it is unnecessary because the area is small, it is important to consider what improvements it can bring to overall site operations.

Key Considerations to Keep in Mind Before Implementing at Small-Scale Sites

On the other hand, there are also points to be cautious about when introducing it to small-scale sites. First, the smaller the site, the more directly a lack of preparation tends to affect the results. When the area to be flown is small, you may be tempted to proceed based on on-site judgment, but if you are careless about nearby obstacles, takeoff and landing locations, work flow, notifying surrounding people, and ensuring safety, it will actually become inefficient.

Also, care must be taken to avoid making data acquisition an end in itself. It is meaningless if what was measured cannot be converted into the required deliverables, cannot be used within the company, or cannot be handed over to the next process. On smaller worksites, site personnel often fulfill multiple roles, so you need to plan for how the data will be operated and used after acquisition.

Furthermore, it is important not to underestimate the effects of weather and the surrounding environment. Even if you think the job will be quick because the area is small, wind, shadows, obstacles, and nearby traffic can prevent things from going as planned. At sites where re-shooting is difficult, the opportunity to take measurements itself is valuable. You should prepare on the assumption that you must obtain the required quality in a single attempt.

Care must also be taken regarding mismatches with accuracy requirements. What drone surveying excels at and what needs to be handled on the ground are different. Depending on the required control accuracy and the intended use of the deliverables, it is more rational to assume a combined approach. Small-scale sites tend to prioritize speed, but increasing the amount of data that is ultimately unusable is counterproductive.

Cases Where Drone Surveying Is Not Suitable

Drone surveying is convenient, but it is not suitable for every small-scale site. A typical example of where it is not appropriate is a site where the information you need is limited to just a few points. For example, if the main purpose is to check the height or position at a few points and you do not need area-based records or later reuse, ground-based surveying can be simpler and faster.

Also, sites where aerial shooting conditions are poor are unsuitable. If obstacles are densely clustered around the site, securing takeoff and landing areas is difficult, it is hard to adequately manage impacts on third parties, or constraints from the surrounding environment are significant, you should not force the use of drones. Safe execution is a prerequisite, and at sites where it is unclear whether flight is possible, alternative methods are more realistic.

Furthermore, sites that require immediate and precise positioning, or sites where detailed understanding of unseen areas is important, can be difficult to handle with drones alone. What is visible from above differs from the information that must be captured directly on site. Because the required outputs are often more specific on smaller sites, it is important to choose methods that match the purpose.

Moreover, if there is no framework to utilize the data after collection, it becomes difficult to realize the benefits of implementation. Even if you go to the trouble of collecting data, if it cannot be reviewed internally, incorporated into drawings or reports, or used for comparative operations, it may not justify the labor spent on small sites. Drone surveying is not a method that ends with shooting; its value is determined by how the data is ultimately used.

How to Proceed Without Failing at Small-Scale Sites

To successfully carry out drone surveying on small-scale sites, it's important not to overreach from the outset. Begin by focusing on a single purpose for which you will use it—this makes failure less likely. Whether it's for assessing current site conditions, creating construction records, comparing earthwork volumes, or preparing explanatory materials, once the purpose is determined the necessary deliverables become clear.

Next, conduct a thorough check of the site conditions. If you organize in advance the surrounding environment, safety measures, permissible shooting hours, the presence or absence of obstacles, and ground surface conditions, your on-site decisions will be steadier on the day. On small-scale sites you may be tempted to simplify the preparation, but in reality the quality of the pre-check determines success or failure.

That said, it's also important not to be fixated on the idea of completing everything with drones alone. Assigning roles—for example, using drones for area-wide assessment and ground teams for necessary standard checks and supplementation—makes it easier to strike a balance between accuracy and efficiency. This combined approach is especially effective on small-scale sites.

Also, it is essential to consider how data once collected can be leveraged in subsequent site operations. Rather than treating it as a one-off shoot, if it can be used for pre- and post-construction comparisons, progress sharing, reports, and stakeholder briefings, the benefits of adoption will be substantial even on small sites. When you consider not only the efficiency of each individual site but also the reusability across overall operations, the value of drone surveying becomes much clearer.

Summary

Drone surveying is often thought to be only for large sites, but it can be effectively used on small sites as well when conditions permit. The points for judgment are not whether the site is confined, but four factors: whether you need to capture the area as a surface, whether it can be safely photographed from above, whether you can streamline the process including preparation and post-processing, and whether the required accuracy and conditions are met.

Especially on small sites, the surrounding environment, the purpose of the deliverables, and whether the data will be used are more important than the small area. If a simple point check is sufficient, other methods are more rational; but if you prioritize sharing current conditions, before-and-after construction comparisons, verifying earthwork volumes, improving safety, or enhancing record-keeping, the value of drone surveying increases. The success or failure of adoption depends not on flying itself, but on clearly defining what you want to obtain and selecting the appropriate approach according to site conditions.

If you want to make surveying and position checks on small sites more practical and efficient, it becomes easier to operate if you consider combining not only an overhead, area-wide overview but also high-precision ground-based positioning. For example, if you want to make on-site coordinate acquisition and simple surveying more accessible, there are options like LRTK, an iPhone-mounted GNSS high-precision positioning device. Organizing the situations where drone surveying should be used and those where quick ground checks are needed, and choosing a method that fits your company’s site size and operational structure, leads to a smooth adoption.