What Can 3D Documentation and Preservation of Cultural Heritage Do? 7 Use Cases Explained

Table of Contents

• Why 3D documentation and preservation of cultural heritage is attracting attention

• Use Case 1: Record the current condition in 3D

• Use Case 2: Use to create comparative records of deterioration and deformation

• Use Case 3: Serve as material for planning and decision-making for conservation and repair

• Use Case 4: Use as reference materials for recovery after disasters or accidents

• Use Case 5: Advance research and information sharing

• Use Case 6: Use for exhibitions and educational outreach

• Use Case 7: Streamline ongoing management and registry maintenance

• How to successfully carry out 3D documentation and preservation of cultural heritage

• Summary

Why 3D documentation and preservation of cultural heritage is attracting attention

In the recording and preservation of cultural heritage, both accurate documentation and subsequent usability are required. For example, in buildings the relative positions of columns and beams, their tilts, deflections, and the connections between members are important, while for stone works, Buddhist statues, and inscriptions, fine losses and abrasion, surface undulations, and the depth of incised lines are important. A major feature of 3D recording is that it makes it easier to capture such information in three dimensions, which is difficult to convey with two-dimensional photographs or text.

Cultural properties each have different conditions and cannot be recreated. Moreover, their condition changes gradually over time. Factors behind these changes are varied, including weathering, cracking, tilting, settlement, loosening of components, surface flaking, and changes in the surrounding terrain. Therefore, recording the condition at a given point in time with high reproducibility is extremely important for future comparison, repair, and restoration.

Furthermore, there are many stakeholders involved with cultural properties—managers, administrative personnel, survey companies, designers, contractors, researchers, educators, and local residents—and the type of information they need and how they view it vary depending on their roles. 3D records make it easy to share shape and arrangement without visiting the site, and they are also effective as a basis for creating a common understanding. The fact that they can convey condition to people who are not familiar with reading drawings is also a major advantage in terms of consensus-building.

Moreover, in recent years, there has been a demand for multifaceted use of recorded data that goes beyond merely preserving cultural properties, encompassing public access and utilization, disaster prevention, tourism, education, and regional revitalization. Once 3D records are established, they can be deployed for many purposes not only for conservation and repair but also for exhibition interpretation, creation of teaching materials, remote sharing, comparisons over time, and disaster response. In other words, 3D record preservation should be regarded not as work for a single purpose but as the creation of an information infrastructure for passing cultural properties on to future generations.

Use Case 1: Preserve the Current Condition in 3D

The most basic and important use is to preserve the current state of cultural properties in three dimensions. This is the starting point of 3D record preservation and the foundation for all subsequent uses. A current-state record means preserving the appearance of the cultural property before you as objectively as possible and in a form that is easy to reuse.

In conventional documentation of existing conditions, photography, measured drawings, sketches, and written records were the primary methods. These remain indispensable today, but they have issues: viewpoints are limited, the locations that can be measured are limited, and the amount of information is affected by the judgment of the photographer or recorder. With 3D recording, because the entire form can be captured as spatial information, it becomes easier to check from different viewpoints later, extract required cross-sections, and consider additional measurements.

For example, with cultural properties such as stone pagodas and stone Buddhas, frontal photographs alone may not sufficiently reveal the extent of damage on the rear, the degree of tilt, or their relationship to the base. If 3D data is available, you can inspect the entire object to determine which faces have missing parts, how the center of gravity is shifted, and whether there are problems with the installation conditions. The same applies to buildings: because roof pitch, eave overhang, floor unevenness, and bulging of wall surfaces can be understood three-dimensionally, the level of understanding is deeper than from photos or drawings alone.

The value of current-condition records increases in the years after they are captured. This is because when deterioration progresses in the future or when you want to compare conditions before and after repairs, you can accurately look back at the past state. Even though maintaining the current condition is the basic principle for cultural properties, in reality they continue to be affected by natural environmental and human factors. For that reason, it is important not to treat the present state as a one-off record, but to preserve it as baseline information that can be reviewed in later years.

At this stage, what you should be aware of is not simply creating a good-looking 3D model, but determining the accuracy and spatial coverage required from a preservation perspective. Whether you need to capture the overall shape, examine wear in fine details, or include surrounding terrain will change the recording methods and photography plans needed. By clearly defining what and how much to preserve according to the type of cultural property and its purpose, the value of the current-condition record is greatly increased.

Use Case 2: Used to record and compare deterioration and deformation

In cultural heritage management, it is important not only to record a single moment but also to monitor changes over time. 3D recording and preservation is an excellent method for comparing such long-term changes. By regularly recording the same subject, it becomes easier to objectively identify changes that are difficult to notice by visual inspection.

Although deterioration can be captured by comparing photographs, the appearance is easily affected by shooting position, lighting conditions, and differences in lenses, and there are limits to quantitatively measuring dimensional differences and displacements. With 3D records, you can overlay past and present data to more easily identify surface retreat, bulging, tilting, settlement, and the widening of defects. This helps both in determining whether repairs are necessary and in budgeting and prioritizing.

For example, with stone cultural properties, abrasion from wind and rain and surface flaking progress little by little. Each change may be slight, but over the course of several years it can affect the legibility of inscriptions and patterns. If 3D records are continuously maintained, it becomes easier to determine which surfaces are particularly vulnerable, at what heights drip marks and salt effects are concentrated, and whether improvements to the installation environment are necessary.

Even for wooden structures, being able to track differential settlement, deformation of structural members, floor tilt, and changes in the roof line over time improves diagnostic accuracy before repairs. Changes that people can only describe as “feeling slightly tilted” become explainable information when comparative data are available. Even if the person in charge changes, referring to past and current data makes it easier to share the continuity and urgency of the changes.

To make comparative recording successful, it is important to design operations on the assumption of continuity. Simply creating a single high-quality record will not enable comparisons over time. By preparing in advance the scope of coverage, recording frequency, reference standards, storage formats, administrators, file naming, and so on, the value increases as data accumulate. 3D documentation and preservation of cultural heritage is most effective when considered not as a one-off annual task but as a framework for medium- to long-term management.

Use Case 3: For Planning and Decision-Making in Conservation and Repair

In conservation and repair work, careful judgment is required about where and to what extent to carry out treatments, whether to prioritize maintaining the current condition, and how to determine the scope of reinforcement and restoration. In that context, 3D documentation and preservation not only improve the accuracy of condition assessments but also serve as a basis for decision-making that facilitates smooth communication among stakeholders.

In the restoration of cultural heritage, there is much information that is difficult to convey with drawings and photographs alone. For example, complex joinery arrangements, wall surface distortions, the way stones meet one another, unevenness of the plinth, and how fine ornamental details are chipped are easier to understand with three-dimensional information. With 3D records, it becomes easy to extract the necessary cross-sections, view the overall balance from a distance, and enlarge and share only the problematic areas.

There is another important reason for accurately recording the current condition before repair. It makes it possible to evaluate the work afterwards. Because it becomes easier to explain where and how improvements were made, which components were in which positions, and to what extent intervention took place, the transparency of the repair records increases. In the conservation repair of cultural properties, being able to explain the appropriateness of the work to future generations is more important than carrying out the work itself. 3D documentation provides material that supports that accountability.

Also, in projects with many stakeholders, there are situations where you want to proceed with discussions while reducing the number of on-site inspections. If 3D data can be shared, the need for additional measurements and explanations of parts is reduced, making it easier to establish a common basis for discussions. The usefulness of 3D records is especially high under conditions such as confined sites, the need for work at height, access restrictions, or many stakeholders located remotely.

Of course, 3D records do not automatically determine repair strategies. Final judgments require on-site observations, material investigations, historical research, and structural assessments. However, preserving 3D records has very practical value in organizing the basic information needed for decisions without omission or excess and in creating a situation where stakeholders can view and discuss the same subject.

Use Case 4: Creating recovery documentation after disasters or accidents

An aspect to place particular emphasis on in the documentation and preservation of cultural properties is the perspective of preparing for disasters and accidents. Earthquakes, heavy rain, landslides, fires, lightning strikes, fallen trees, and collision accidents — there are many risks surrounding cultural properties. If you begin recording only after damage has occurred, the original condition cannot be restored. By maintaining 3D records during peacetime, you can secure the information needed to make recovery decisions in the event of an emergency.

At disaster sites, securing safety is the top priority, and it can be difficult to gain an overall understanding of the damage. This is because components may be scattered, access may be restricted, and there may be risks of additional collapse. In such cases, pre-disaster 3D records make it easier to confirm which components were where, how much they had deformed, and what the surrounding terrain and installation conditions were. This is useful both for formulating recovery policies and for preparing damage reports.

For example, even if a stone structure has toppled, having pre-disaster data makes it easier to develop a restoration plan by referring to its original orientation and tilt and to its positional relationship with the foundation. When parts of a building are lost, past records can also be used as clues to dimensions and how elements fit together. This is particularly significant for cultural heritage that includes decorative components or traces of handcrafting, where the presence of pre-disaster three-dimensional information is extremely important.

Furthermore, prompt explanations are required in disasters. It is necessary to organize for administrators, public authorities, experts, contractors, and local stakeholders how extensive the damage is, what has been lost, and what responses are needed. 3D records are easier than photographs to share the before-and-after differences of damage and are more persuasive as explanatory materials.

From a disaster-prevention perspective, the important thing is not to be reassured by merely recording data. Unless you design operational procedures that include where the data are stored, backups, viewing permissions, and procedures for retrieving data during disasters, you will not be able to use them when needed. 3D documentation and preservation of cultural heritage is both a preservation activity in normal times and a preparedness measure for emergencies. Adopting this mindset greatly alters the priorities for implementation.

Use Case 5 Advancing Research and Information Sharing

Cultural properties should not only be preserved but also have their value clarified through research, and those findings should be shared. 3D documentation and preservation are effective as research data and provide a foundation that enables multiple stakeholders to advance their examinations while referring to the same object.

For example, aspects such as the depth of score lines, the direction of tool marks, differences in surface finishes, the consistency of member dimensions, traces of additions or renovations, and joint detailing—some of the information that traditionally had to be confirmed on site—become easier to grasp on 3D data. Of course, physical inspection is ultimately necessary, but even just improving the accuracy of preliminary examinations can greatly enhance the efficiency of investigation planning.

Moreover, when researchers or specialists are located remotely, being able to share the same subject with high fidelity is a major advantage. Parts that are easily overlooked or prone to differing interpretations in photographs can be discussed on a common basis when three-dimensional information is available. Such a common foundation is important in evaluations of cultural properties and in deliberations about repair or restoration policies.

The effects of information sharing are not limited to experts. It also makes it easier to intuitively convey the condition and value of cultural properties to administrators, local residents, educators, and during presentations to councils. Information that is hard to communicate with drawings and technical terms alone can be organized based on 3D records, making it easier to explain why preservation is necessary, which parts are deteriorating, and what kinds of interventions are required. This also contributes to building understanding of preservation projects.

Furthermore, the idea of utilizing 3D records as a repository for accumulating survey results is also important. While information tends to become scattered when relying solely on individual reports, linking various survey outcomes to 3D data as a common reference makes later reuse easier. Research and investigation of cultural properties are not something that can be completed in a single effort. As a foundation for connecting information that spans multiple years, multiple personnel, and multiple disciplines, the value of preserving 3D records should increase going forward.

Use Case 6: Utilizing for Exhibition Displays and Educational Outreach

The 3D documentation and preservation of cultural properties has great potential not only for conservation management but also for public exhibition and educational outreach. Cultural properties are inherently meant to convey their value widely to society, but due to conservation constraints they face challenges such as being untouchable, inaccessible, only displayable in low-light conditions, or having limited exhibition periods. With 3D records, it becomes easier to devise ways to convey information while protecting the originals.

For example, presenting normally hard-to-see backs, tops, internal structures, and fine design details in three dimensions deepens visitors' and learners' understanding. Even areas that are difficult to inspect on site can be explained by navigating between the overall view and the details using 3D documentation. This is effective not only for conveying the appeal of cultural heritage but also for helping people understand the importance of its preservation.

In educational settings, 3D documentation is an easily usable resource. When turning local cultural properties into teaching materials, even subjects that are difficult to grasp spatially with photographs alone can more readily spark interest in their shapes and structures if three-dimensional information is available. Especially in local studies and history education, it provides an opportunity to understand cultural properties not merely as old objects but as entities connected to people’s livelihoods, technologies, beliefs, and the regional environment.

In addition, even cultural properties that are difficult to make accessible for preservation reasons, or cultural properties located in remote areas that are hard to visit, can have their access barriers lowered by using 3D records. This not only expands opportunities for public access, but also has the advantage of being easier to adapt to situations with movement restrictions, such as disasters or infectious disease outbreaks. It does not replace the value of the original object, but it is extremely effective as an auxiliary means to bring people closer to the real thing.

The key point here is not to overly prioritize flashy presentation meant merely for show. In the public use of cultural heritage, accuracy and the presentation of context are more important than entertainment value. Even when using 3D recording, it is necessary to carefully consider which information to emphasize, what scope to reproduce, and what not to omit. It is important to position 3D record preservation as a means of balancing conservation and public access.

Use Case 7 Streamlining Ongoing Management and Ledger Maintenance

In the management of cultural properties, not only large projects such as surveys and repairs, but also routine tasks—daily inspections, register updates, condition checks, handovers, and report preparation—account for a significant portion of the work. 3D documentation and preservation also help streamline the efficiency of such ongoing management.

Cultural property ledgers and survey records document a great deal of information, such as location, dimensions, materials, age, condition of preservation, and repair history. However, there are often aspects that remain difficult to grasp from text alone, and each time the person in charge changes, the burden of on-site verification can arise. If 3D records are maintained as standard reference information, it becomes easier to visually share the object's shape, arrangement, and damage locations, improving the quality of handovers.

Also, even if you retake photographs at each regular inspection, it can be difficult to compare them with past ones. By using 3D records as a baseline, you can more easily organize inspection records and more clearly convey the locations and extent of abnormalities. This is a benefit that tends to be felt most strongly at sites where a small team manages multiple cultural properties.

In addition, in areas where cultural properties are scattered, it is useful as reference material to check before visiting the site. It makes it easier to organize the information needed to prepare for on-site surveys—for example, from which directions the site can be accessed, whether there are obstacles nearby, and the size of the object and its installation condition. As a result, it also helps prevent oversights in on-site work.

What matters in ongoing management is not creating data, but managing it in a form that can continue to be used. If file formats are too specialized, storage locations are individualized, there are no naming rules, or the relationships with related documents are unclear, even valuable 3D records cannot be fully utilized. If you introduce the preservation of 3D records for cultural properties, it is essential to organize the relationships with registers, inspection records, photographic records, and reports, and to incorporate that perspective into your workflows.

How to Successfully Implement 3D Documentation and Preservation of Cultural Heritage

As you have seen so far, there are many possible applications for 3D documentation and preservation of cultural properties. However, simply introducing it will not automatically produce results. To minimize failures in the field, there are key points to address at the outset.

First and foremost, it is important not to narrow the purpose too much. For example, if you start solely with "to create figures for a report," the resulting data may not be suitable for future comparisons or public use. Conversely, aiming for万能 data that can do everything places a heavy burden on the field. It is realistic to organize the primary and secondary objectives—such as preserving the current condition, enabling comparisons, supporting repairs, disaster prevention, and public release—and then decide the required accuracy and scope.

Next, it is also important to consider how much of the surrounding environment to record, not just the object itself. Cultural properties do not exist in isolation; their value and conditions for preservation are deeply related to elements such as the base platform, ground, precincts, access routes, surrounding topography, and positional relationships with buildings. If you record only the object in isolation, you may lack information that would be useful later.

Also, continuity is key in operations. Rather than treating it as a one-year project deliverable, it is important to standardize naming conventions, storage locations, persons responsible for updates, and the way metadata is written so that records can be linked for comparison and additional entries in subsequent years. In the practice of cultural property, information needs to be left on the assumption that a different person will be using it several years later. It is not sufficient for it to be understandable only to the current person in charge.

It is also necessary to consider measures to reduce the burden on site. At cultural property survey sites, constraints such as time, weather, location, safety conditions, and access restrictions are significant, and work cannot always be carried out as ideally planned. Therefore, it is desirable not to make equipment and methods overly complicated, and to operate in a way that can ensure a consistent level of quality even within limited time. Systems that can only be handled by a small number of personnel with special skills are difficult to sustain.

Above all, 3D recording is a means, not an end. What matters is preserving cultural properties more effectively, conveying them appropriately, and supporting necessary decision-making. Instead of focusing on creating visually attractive data, always being aware of which challenges in conservation practice you want to address is the quickest route to successful implementation.

Summary

What 3D documentation and preservation of cultural properties can achieve is not limited to merely creating three-dimensional representations. It can objectively record the current condition, compare changes over time, serve as a basis for decisions about conservation and repair, provide recovery materials after disasters, share survey and research findings, be used for exhibitions and education, and even streamline ongoing management—the range of potential uses is very broad.

For practitioners, the important thing is to view 3D recording not as a trendy technology but as foundational information for the long-term protection of cultural properties. By positioning it not as a replacement for traditional records—photographs, drawings, and written documents—but as a means to complement them and to elevate them into forms that are more reusable and easier to explain, the rationale for adopting it becomes clear.

Going forward, conservation sites for cultural properties will increasingly demand not only accuracy in records but also mobility and continuity. If you want to efficiently carry out documentation that includes on-site location information, preparing an environment that enables high-precision positioning alongside 3D data and photographic records will be an operational advantage. If you want to record cultural property surveys and their surrounding conditions more reliably, adopting a system like LRTK, an iPhone-mounted GNSS high-precision positioning device, can make it easier to enhance the reproducibility and operability of field records. Rather than treating 3D record preservation as a one-off effort, consider integrating the development of recording methods and position information acquisition as part of building a system that can be used continuously.