What Is 3D Measurement of Temple and Shrine Buildings? 6 Basics to Know Before Adoption

In the maintenance, inspection, repair planning, and archival documentation of temple and shrine buildings, there is a growing number of issues that cannot be fully captured by traditional drawings and photographs alone. Much of the information that needs to be verified in three dimensions—such as roof warping, leaning pillars, subtle variations in ornamental detail, the progression of aging, and the relationship with surrounding terrain—is difficult to grasp, and it is not easy for stakeholders to form a shared understanding. Against this backdrop, 3D measurement for capturing temple and shrine buildings as three-dimensional information has attracted attention.

That said, when people hear about 3D measurement of temple and shrine buildings, many practitioners feel it seems difficult and requires specialized equipment, that it’s hard to tell how far it can go, and that they might not be able to make full use of it even if they introduce it. In reality, 3D measurement is not simply about adopting the latest technology; it is important to consider it as a means to make on-site decision-making easier, improve the accuracy of records, and enhance the explainability of repairs and preservation.

This article organizes six basics to keep in mind before adopting 3D measurement for temple and shrine buildings, aimed at those considering it for the first time. It explains what can be done, what kinds of deliverables it leads to, in which situations it is useful, and what points to watch out for, presented in a way that makes practical decision-making easier.

Table of Contents

• Background: The need for 3D measurement of temple and shrine buildings

• Basic 1: 3D measurement is a method to preserve temple and shrine buildings as three-dimensional information

• Basic 2: The success of 3D measurement for temple and shrine buildings depends on how the objectives are set

• Basic 3: Clarify the required accuracy and the target scope at the outset

• Basic 4: Deliverables of 3D measurement are not limited to point clouds or models

• Basic 5: The ability to respond to on-site conditions is particularly important for temple and shrine buildings

• Basic 6: Consider implementation including the design for post-measurement utilization

• How to proceed when introducing 3D measurement for temple and shrine buildings

• Summary

Background: Why 3D Measurement of Temple and Shrine Buildings Is Needed

Temple and shrine buildings present challenges that differ from those of typical buildings. First, their designs are often complex and frequently are not made up solely of straight lines or simple planes. There are many elements that are difficult to convey with plan drawings alone, such as the curves of roofs, overlapping bracket complexes (kumimono), carvings and ornamentation, subtle unevenness in floors and columns, and continuity with the surrounding landscape. Second, because these buildings have existed for long periods, it is necessary to accurately capture their current state—which often differs from the original construction and includes a history of deformation and repairs.

Furthermore, in work on temple and shrine buildings, it is necessary not only to confirm the current condition but also to share that information with many stakeholders. There are many situations where people in different roles—managers, designers, construction personnel, surveyors, and experts involved in preservation—need to proceed with decisions while looking at the same subject. At those times, photographs alone may not capture the areas they want to see, and drawings alone may not convey the spatial relationships well. 3D measurement is effective as a means of reducing such discrepancies in information sharing.

Additionally, in recent years the importance of record preservation has come to be more strongly recognized. Even data that currently seem to have limited uses—such as comparisons before and after repairs, considerations for recovery in the event of disasters, confirmation of the positional relationships of components, and preparation for future re-surveys—can later prove to have great value. Temple and shrine buildings are highly unique subjects that cannot be exactly reproduced, which is precisely why it is so important to preserve their appearance at that point in time as accurately as possible.

However, introducing 3D measurement does not automatically solve problems. If you proceed while keeping unclear what you are measuring for, issues tend to arise such as having an excessive amount of data that is difficult to use, insufficient accuracy in the required parts, and missed captures on site. That is precisely why it is important to get the basics right before implementation.

Basic 1 3D measurement is a method for preserving temple and shrine buildings as three-dimensional information

3D measurement of temple and shrine buildings involves capturing the shape and positional relationships of the subject as three-dimensional information so that it can later be reviewed from arbitrary viewpoints, read for dimensions, or developed into drawings and models. A major feature is that information which is difficult to grasp from only two-dimensional outputs such as plans, elevations, and sections can be retained in a three-dimensional state.

The important point here is that the essence of 3D measurement is not merely "making three-dimensional objects look good." In practical work, there are many cases where factors such as positional consistency, ease of dimensional verification, reconfirmation of site conditions, comparison of changes over time, and clarity as material for discussions are more important than visually appealing three-dimensional representations. In other words, 3D measurement is both a representation technique and a recording technique, and it serves as a foundation for decision support.

For temple and shrine buildings, it is important to understand not only the main structure but also the surrounding environment, such as stone steps, base platforms, approach paths, retaining walls, elevation differences within the precincts, and the relationship with surrounding trees. Traditionally, buildings were treated as buildings, terrain as terrain, and photographs as photographs, so information tended to be separated, but 3D surveying makes it easier to organize these elements in a way that preserves their spatial relationships. This also helps with stormwater management, verifying circulation paths, planning temporary works, and arranging repair work.

Also, by preserving it as three-dimensional information, the range of things that can be checked without repeatedly visiting the site expands. Of course, there are situations where on-site verification is necessary for final decisions, but at the stage of initial studies or stakeholder briefings, being able to reconfirm the current conditions digitally alone can lead to significant efficiency gains. It is especially useful when consulting with distant stakeholders or when you want to compare with past conditions.

On the other hand, 3D measurement is not a cure-all. It cannot capture everything at once — the internal condition of timber elements, the structure of unseen parts, or the inner details of material deterioration. Its primary role is to capture external geometry and visible conditions with high reproducibility. Therefore, it is premised on being used in combination with other investigation methods such as tapping, visual inspection, photographic records, and review of existing documentation. The first step in introducing it is not to place all expectations on 3D measurement alone, but to understand what information it can supplement and use it accordingly.

Basic 2 The success of 3D measurement of temple and shrine buildings depends on how the objectives are set

The most important thing for successfully performing 3D measurements of temple and shrine buildings is defining the objective. Even for the same temple or shrine building, the required coverage, accuracy, the way data are produced, and how the team operates on site can change greatly depending on the purpose of the measurement. If you proceed with an unclear objective, you may later encounter problems such as "the necessary parts were not captured," "the way accuracy was applied was wrong," or "it's difficult to convert the results into the desired deliverables."

For example, if the primary purpose is to record the current condition, priority should be given to capturing the overall shape of the building comprehensively. If it will be used as preliminary documentation for repair design, emphasis should be placed on checking deformations, surface unevenness, the positional relationships of members, and how details fit together. If it will be used as explanatory material for preservation or reuse, readability and ease of operation that convey information to non‑experts become important. If it is retained for recovery or comparison in the event of a disaster, it should be recorded with a view to making future reuse easy.

On-site at temple and shrine buildings, stakeholders can have subtly different expectations. Managers may want to use the data to support future maintenance, designers may emphasize producing drawings and checking cross-sections, and contractors may want to use it for scaffold planning and construction procedures. If these expectations are not clarified at the outset and work proceeds, the collected data tends to end up being inadequate for anyone.

Therefore, when introducing it, it is important to clarify "which decision it will be used for", "at what point it will be used", and "who will use it." As on-site operational staff, rather than simply commissioning 3D measurement, you should verbalize which information will be needed in which situations. There is no need to organize this using difficult technical terms; practical, work-focused expressions such as "want to check the overall shape", "want to see tilt and height relationships", "want to be able to verify dimensions later", and "want to use it for stakeholder explanations" are sufficient.

Also, it is important not to limit the purpose to just one. For subjects such as temple and shrine buildings, there are many cases where you want to produce records in a single field survey that can serve multiple uses. However, the more uses you add, the more requirements arise, so you need to set priorities. Deciding what to prioritize makes it easier to determine the level of precision to apply and how to choose the scope of coverage. Purpose setting should be regarded not as a preliminary step before 3D measurement, but as a central process that determines the overall quality of the measurements.

Basic 3: Begin by clarifying the required accuracy and the target scope

In 3D measurement of temple and shrine buildings, people tend to assume that the higher the accuracy the better and the wider the coverage the more reassuring, but in practice it’s not that simple. Trying to increase accuracy raises the burden of on-site work and processing, and expanding the coverage increases the volume of data. What’s important is to set the accuracy and coverage that are necessary and sufficient for the intended use.

For example, the required point density and level of detail differ depending on whether you want to grasp the overall arrangement of a building and its connection to surrounding terrain, or whether you want to check the fit of components and the shapes of fine decorative details. In the former, overall consistency is important, while in the latter some localized, highly detailed capture is necessary. If you do not distinguish between these and try to measure everything the same way, both the time required and the volume of data tend to balloon.

Practically, it is easier to organize if you separate measurements that capture the whole from measurements that focus on selected areas in detail. In temple and shrine buildings, it is common for priorities to differ: the entire exterior including the precincts, the building’s overall exterior appearance, major interior spaces, damaged areas, distinctive design features, and junctions/details that are important for construction. Rather than trying to record everything at the same resolution, deciding in advance which parts are for overall understanding and which are for detailed inspection makes it possible to create a plan with minimal excess or deficiency.

Furthermore, it is important not to understand the term "accuracy" solely as numeric values. In practice, the approach changes depending on whether absolute positional alignment is required or whether relative shape capture is sufficient. When dealing with the entire site or the relationship to surrounding structures, the handling of control points and coordinates can become important. Conversely, when inspecting internal details or decorative elements, the reproducibility of shapes within the subject may be prioritized. In short, accuracy is not uniform; the aspects to consider vary according to the intended purpose.

In temple and shrine buildings, there are many conditions that make measurement difficult: places that cannot be seen without scaffolding, locations at height that are hard to approach safely, areas shaded by trees or eaves, dark spots, and materials prone to reflection or transmission. Therefore, rather than defining the scope based on ideals alone, it is necessary to organize it realistically while taking site conditions into account. The important point here is not to leave places that cannot be captured ambiguous. If there are locations that are difficult to acquire, you should either supplement them with alternative methods on that premise or decide how they will be handled in downstream processes. Organizing accuracy and scope is not merely setting work conditions but a design task to prevent problems later.

Basic 4 3D measurement deliverables are not limited to point clouds and models

Many people find it hard to understand what deliverables they will get when considering 3D measurement of temple and shrine buildings. Well-known examples are point clouds containing large amounts of positional information within the space and models representing three-dimensional shapes, but in practice those are not the only important things. Rather, it is important to think through how to translate them into a form that is ultimately easy to use on site.

For example, three-dimensional data can be used to produce plan, elevation, and section drawings. With conventional drafting, it was necessary to verify dimensions on site many times, but if 3D measurements are taken first, it becomes easier later to change section positions for review or to check the dimensions of areas you want to see. In temple and shrine buildings, because the structures are not necessarily geometrically regular, simply having three-dimensional information as the basis for drawing is itself highly significant.

It is also valuable as visualization material for stakeholder briefings. By showing complex roof shapes, the positional relationships between buildings, and the extent of repair target areas in three dimensions, they become easier to understand. In discussions about preservation and reuse, clear explanations for non-expert stakeholders are often required, and materials derived from 3D measurements serve as that bridge.

Furthermore, it is also well suited to time-series comparisons. If you want to compare how things changed before and after repairs or where changes occurred over a given period, having 3D data recorded to the same standards makes it easier to organize differences that are difficult to discern from photographs alone. Because temple and shrine buildings are conserved over long periods, it should not be overlooked that this approach enables uses that are not limited to a single point in time.

One thing to be careful about here is not to treat the delivery of point clouds or models as the end of the deliverable. Certainly those are important as source data, but what practitioners interact with on a daily basis is often review drawings, explanatory documents, comparison materials, or easily shareable viewing formats. In other words, you need to anticipate from the outset what the source data will be transformed into and who will use it in which situations.

In 3D measurement of temple and shrine buildings, acquiring data itself is not the outcome. Only by considering how the obtained information will flow into survey, design, construction, preservation, explanation, and documentation does the implementation become truly effective. If the definition of the deliverables remains vague, they become difficult to use after delivery. It is important to work backwards from what is actually needed on site and concretely define the deliverables.

Principle 5: Adaptability to Site Conditions Is Particularly Important for Temple and Shrine Buildings

In 3D surveying of temple and shrine buildings, the ability to adapt to on-site conditions is required even more than for ordinary buildings. The reason is not only that the subject itself is complex, but also that the measurement environment has unique constraints.

For example, the precincts may contain trees, stone lanterns, walls, and auxiliary structures that can limit lines of sight. There may be insufficient clearance around the building, and care must be taken not to obstruct the flow of visitors. Brightness and the way shadows fall can also change significantly depending on the time of day and the weather.

Furthermore, temple and shrine structures often include many locations that are difficult to measure, such as high areas, under eaves, low positions close to the floor, narrow passageways, and dark interior spaces. In places with characteristics like the color and surface condition of wood, reflections from metal components, or glass- or water-like surfaces, it can be difficult to capture information as it appears visually. If you plan without understanding these conditions and proceed with the same mindset used for ordinary buildings, the more important elements are more likely to be missed.

Therefore, in 3D surveying of temple and shrine buildings, designing the workflow — such as the order in which to move around the site, which locations to prioritize, and which times of day are appropriate — is extremely important. Rather than simply taking equipment and measuring, it is necessary to develop a data acquisition plan that takes into account the shape of the subject and the on-site conditions. In particular, when dealing with elevated areas or fine ornamental details, one must consider balancing safety and data acquisition quality.

Moreover, temple and shrine buildings are religious facilities and places of high cultural value, so they require greater care than ordinary buildings. Considerations beyond technical matters—such as work hours, access areas, overlap with events, impacts on worshippers and other stakeholders, and preventing contact with equipment and fittings—directly affect the quality of the work. If prior coordination is insufficient, it may be impossible to enter the planned areas, work time may be shorter than expected, or movement may be restricted due to the need for quiet.

Considering this, 3D measurement of temple and shrine buildings is not determined solely by equipment performance. The ability to read on-site constraints and flexibly construct a measurement plan to match them influences the outcome. As practitioners, it is important to clarify which locations are critical, which time periods cause the least disruption, and which actions require special consideration, and to share this with stakeholders. Understanding local site conditions is a prerequisite for improving quality and is an especially indispensable perspective for temple and shrine buildings.

Basic 6 Consider introduction that includes design for post-measurement utilization

A common pitfall in 3D measurement of temple and shrine buildings is that attention becomes focused on the day of measurement, and plans for how to utilize the data afterward remain vague. In reality, the value is determined after the data are acquired. If you do not clarify how the data will be stored, who will view it, which operations it will be handed over to, and how future reuse will be considered, the hard-won data will not be put to use.

In work on shrine and temple buildings, records may be referred to over a long period. Uses include before-and-after comparisons of repairs, re-surveys several years later, verification of current conditions after disasters, and accumulation as management records; these uses are not one-off. Therefore, it is important to organize information in a way that remains easy to understand even if the person responsible changes. Ensuring it is clear which area was measured, when, and for what purpose, and what the standards and conditions were, can greatly affect its future value.

Also, the viewing environment is important. If data is provided only in specialized formats, only a limited number of people may be able to handle it. If it will be used for stakeholder briefings, internal sharing within agencies, or on-site verification, it is necessary to convert it into a form that anyone can easily understand. Conversely, in situations where it will be used for drawing creation or detailed examination, the accuracy and positional alignment of the original data become important. In other words, even for a single dataset, you need the mindset of tailoring how it is presented to the user.

Furthermore, when designing how to use it, it is important to consider the question, “Which decisions will this speed up?” On-site at temple and shrine buildings there are practical challenges such as wanting to reduce the number of site revisits, make stakeholder consultations smoother, and reduce misunderstandings about repair targets. The value of 3D measurement becomes clear when it is tied to those concrete operational improvements. The mere fact of having introduced the latest technology is not a reason to continue its adoption.

That is why it is important, at the pre-implementation stage, to plan out who will use the measurements and how they will use them after they are taken. 3D surveying of temple and shrine buildings should be regarded not as a one-off task that ends with data acquisition, but as part of creating a system that links documentation and practical use. Adopting this perspective naturally makes it easier to organize the required deliverables, the necessary accuracy, and the on-site priorities.

How to Proceed When Introducing 3D Measurement for Temple and Shrine Buildings

We have reviewed six basics so far, but when advancing implementation on actual sites, it becomes easier to make decisions if you organize your thinking step by step. The first thing to do is to clarify the target and the purpose. Decide which building, how comprehensively, and for what purpose you want to document it. At this stage, it is important to put into words whether it is meant as a current-condition record, for repair planning, for preparing explanatory materials, or for future comparison.

Next, decide on the required deliverables. What you need to prepare will vary depending on whether you require the 3D data itself, are aiming to produce drawings, or need comparison materials or viewing materials for sharing. If this is left vague, additional work is likely to arise later. For complex subjects such as temple and shrine buildings, you cannot freely convert everything after data acquisition, so it is essential to think backwards from the intended outputs.

On that basis, we develop a plan that takes site conditions into account. We organize the circulation routes within the precincts, entry/access conditions, allowable working hours, the effects of season and weather, shielding by trees and structures, the presence or absence of high or dark areas, and decide the order in which measurements will be taken. For temple and shrine buildings, site conditions affect quality even more than for ordinary buildings. It is important to have not only measurement techniques but also a site-management perspective.

And the design should include post-acquisition data management. Decide where it will be stored, who will be allowed to view it, how it will be connected to future comparative use, and how it will be linked with related materials, so that it is less likely to end up as a one-off record. In particular, because temple and shrine buildings are subjects of ongoing conservation, it is necessary to adopt a mindset that does not treat information obtained once as a one-off.

In the initial stage of implementation, it's important not to try to make everything perfect all at once. Start with tasks that have clear purposes—such as surveying the current condition of the entire building or focused recording of areas planned for repair—as this makes it easier to gain understanding within the company and among stakeholders. By actually using the system, you will see how much accuracy is required, which deliverables are useful, and what should be improved next time. 3D measurement of temple and shrine buildings should be regarded not as a one-off implementation but as an ongoing effort to refine operations to suit the site, which increases its effectiveness.

Summary

3D surveying of temple and shrine buildings is not merely an advanced digital technology, but a practical means to grasp the current condition three-dimensionally, record it, share it, and pass it on to the future. The effectiveness of 3D surveying is especially high for temple and shrine buildings, where shapes are complex, understanding the current condition including aging is important, and many stakeholders are involved.

Before implementation, you should grasp: correctly understanding what 3D measurement means; clearly setting objectives; defining the required accuracy and scope; thinking about deliverables from the end use; prioritizing responses to on-site conditions; and considering implementation to include planning for post-measurement use. If you understand these six fundamentals, it will be easier to implement 3D measurement in a way that can actually be used on-site rather than adopting it vaguely.

In surveys and maintenance of temple and shrine buildings, there are often cases where you want to capture not only the shape of the building itself but also the surrounding terrain and the positional relationships within the precincts. In such situations, having a setup that can accurately handle positional information alongside three-dimensional records makes on-site decision-making and record organization easier. If you are considering an operation that emphasizes current 3D capture and positional alignment, combining options such as LRTK, a smartphone-mounted GNSS high-precision positioning device, can make recordkeeping for temple and shrine buildings easier to implement in practice. If you are about to introduce 3D surveying for temple and shrine buildings, thinking not only about whether to measure but also about how to record on-site, how to geolocate the data, and how to link it to subsequent tasks will greatly affect the outcomes.