Is 3D Necessary for Cultural Heritage Documentation and Preservation? Six Basics to Know Before Implementation

Table of Contents

• Background: Why 3D Is Attracting Attention in Cultural Heritage Documentation and Preservation

• Basic 1: Use 3D to Preserve Condition, Not to Create Appearance

• Basic 2: Suitable Recording Methods Vary by Type of Cultural Property and Purpose

• Basic 3: Accuracy Should Be Determined by Purpose, Not Maximized Unconditionally

• Basic 4: 3D Data Only Becomes Valuable When Post‑acquisition Organization and Long‑term Preservation Are Planned

• Basic 5: 3D Does Not Stand Alone — Its Value Increases When Combined with Photos, Drawings, and Written Records

• Basic 6: Success Depends More on Operational Structure and Continuity Than on Equipment

• Conclusion

Background: Why 3D Is Attracting Attention in Cultural Heritage Documentation and Preservation

In cultural heritage documentation and preservation, a variety of methods have long been used, including photography, measured drawings, ledger maintenance, before‑and‑after repair comparison records, and literature research. These methods will remain important, and 3D will not completely replace them. However, there are certainly issues on heritage sites that are difficult to address with traditional materials alone.

For example, stone works or Buddhist statues with complex sculptural expressions can be difficult to convey sufficiently in terms of depth and contour changes using only planar photographs. For buildings, columns, beams, roof warping, tilting due to differential settlement, and detailed deformations are sometimes simplified in the process of creating drawings. In wide areas that include ruins and topography, there may be many partial photos but the overall positional relationships are not organized, making later re‑examination difficult. When disasters or deterioration progress, how accurately the state at a given point in time was recorded directly affects repair policy and restoration decisions.

The reason 3D attracts attention in such situations is that it allows the shape itself to be treated as spatial information. Because it can be preserved as surfaces, points, or three‑dimensional models, it becomes easier afterward to confirm dimensions, compare changes, or have other parties examine the same materials. Another major advantage is the ease of secondary use of the records. Acquired data can be used across multiple tasks: illustrations for survey reports, consideration of repair plans, visualization for exhibitions, creation of materials for education and outreach, remote sharing, and future additional analyses.

However, attention alone does not mean everything should be converted to 3D. What is truly important in cultural heritage documentation and preservation is to clarify what to preserve, why, at what level of granularity, for how long, and for whom. 3D is one effective method for those purposes, not the purpose itself. If you confuse the two, creating visually impressive models can become the main goal, and organizing the information necessary for preservation records will be postponed. The first perspective to grasp before implementation is to understand 3D’s value in terms of recordability rather than showiness.

Basic 1: Use 3D to Preserve Condition, Not to Create Appearance

When the term 3D gains attention in the cultural heritage field, many people imagine models that look three‑dimensional or rotatable images. Of course, there is value in making things easy to understand visually. However, what should be prioritized in practical record‑keeping is not visual appeal during viewing but how well the condition can be re‑verified.

In heritage preservation, the original object cannot necessarily be maintained forever. Environmental changes, aging, disasters, damage, and repair interventions gradually alter condition. Therefore, there is great significance in preserving the shape and surface condition at a given point in time in a way that can be verified later. The strength of 3D is not mere aesthetic three‑dimensional representation but the ability to retain spatially the positions, heights, surface undulations, shapes of missing parts, and relationships among components.

For example, when cracks or wear are observed on part of a cultural asset, photographs alone can be affected by shooting angle and lighting conditions, making it difficult to compare the amount of change. 3D records can serve as a foundation for time‑series comparison of shape changes. For buildings, they make it easier to grasp alignment, tilts, and fitting discrepancies of components. For stone works or inscriptions, they can be used as supporting materials to examine subtle surface undulations and the preservation of carved lines.

What is important here is to shift the mindset when introducing 3D from making a finished product to preserving a record asset. The finished‑product mindset tends to value tidy appearance and ease of operation. In contrast, the record‑asset mindset values the history: what extent was captured, where the blind spots are, how reference points were established, what shooting or measuring conditions were used, and how much complementary processing was applied. In other words, not only the data itself but also the acquisition conditions and processing assumptions become part of the record.

When considering 3D, it is useful to first verbalize “which condition of this cultural property do we want to preserve?” Whether you prioritize an overall understanding of shape, fine surface detail, future comparative verification, supporting repair design, or double as material for public dissemination will change what data is needed. Thinking of 3D as something to preserve rather than something to display is the first step to preventing failed implementation.

Basic 2: Suitable Recording Methods Vary by Type of Cultural Property and Purpose

Cultural properties are extremely diverse. Subjects range from buildings, stone works, and sculptures to archaeological artifacts, ruins, gardens, ritual spaces, streetscapes, and landscapes including terrain — each differing in scale, material, and preservation challenges. Therefore, 3D recording methods cannot be considered uniform.

For example, targets that emphasize fine surface expression benefit from high‑density shape capture and high‑resolution image recording. Conversely, when you want to capture the overall building or its relationship with surrounding terrain, methods that efficiently cover wide areas are more suitable. Indoor versus outdoor conditions, scaffolding availability, closability for close access, material reflectivity or translucency, weather impact, and presence of surrounding obstacles all change the appropriate method.

Also, even for the same cultural asset, the record required changes with the purpose. If the main purpose is grasping the current state, it is important to capture the overall shape without omission. For repair planning, you need records that make it easy to confirm positions of deformation and deterioration, take measurements, and be shared among stakeholders. For exhibition or public display, accessibility and explanatory quality are emphasized. For academic research, raw data close to pre‑processing form and clarity of acquisition conditions are important.

A common pitfall to watch for is deciding the method first. A frequent failure is thinking “we want to 3D‑ize so we will use this method,” which can result in insufficient coverage, accuracy, or metadata organization that were actually necessary. The right approach is the opposite: decide “what needs to be preserved for this purpose,” and then choose the acquisition method and data format that meet those conditions.

For example, documenting heritage buildings may require multiple layers of information such as overall shape, elevations, sections, component dimensions, and positional relationships with surroundings. For stone monuments or cliff carvings, reading carved lines and understanding surface deterioration may be the challenge. For ruins, quickly preserving the state at the time of excavation may be the priority. You must consider the required recording granularity for each combination of subject and purpose.

Before implementation, organize at least the “size of the subject,” “required recording extent,” “information to prioritize,” “site conditions,” “future users,” and “reuse possibilities.” 3D is not omnipotent, but chosen to fit the purpose it can be extremely powerful. Conversely, if you introduce it while leaving subject and purpose ambiguous, you may end up with data that cannot support decision‑making.

Basic 3: Accuracy Should Be Determined by Purpose, Not Maximized Unconditionally

When considering 3D recording, many practitioners first worry about accuracy. Accuracy is of course important. However, in cultural heritage documentation and preservation, higher accuracy is not always better. What matters is designing accuracy to be neither excessive nor insufficient for the intended use.

Pursuing accuracy beyond what is necessary increases acquisition time, processing load, data volume, operational cost, and difficulty of sharing. Conversely, falling below the necessary accuracy leads to problems such as inability to confirm dimensions later, inability to use the data for comparative verification, or inability to form the basis for drawing. Therefore, accuracy should be judged not as an absolute number but in relation to the intended use.

For instance, if the main purpose is to understand broad positional relationships or layout, capturing the whole within a consistent coordinate system may be more important than detailed small surface undulations. On the other hand, if you want to examine surface wear or remaining carved lines, a coarse model is meaningless. For deformation assessment or repair planning for buildings, required accuracy may differ by component. In short, do not treat the entire cultural asset under a single accuracy standard; think by use case, component, or process.

When discussing accuracy, it is also important not to judge by numbers alone. 3D data quality is determined by multiple factors: point density, surface smoothness, how images are mapped, paucity of blind spots, amount of noise, stability of alignment, consistency with reference points, and documentation of acquisition conditions. A visually pleasing model may have a lot of interpolative processing and not faithfully reflect the actual condition. Conversely, slightly coarse but well‑documented measurement data that is easy to re‑verify can be more valuable as a preservation record.

To design accuracy in the field, it is effective to first envision the deliverables. Consider what scale you want drawings at, what you will compare against, what degree of dimensional confirmation is necessary, and which departments will use it in the future — these clarify the required accuracy level. Then assemble acquisition methods, reference point placement, shooting plans, and verification methods to achieve an operation without major excesses or deficiencies.

What cultural heritage documentation and preservation truly require is not the highest possible accuracy but usable accuracy. Aim for accuracy that can be handled in the field, explained, and reused — this is most important in practice.

Basic 4: 3D Data Only Becomes Valuable When Post‑acquisition Organization and Long‑term Preservation Are Planned

A commonly overlooked aspect when considering 3D introduction is post‑acquisition organization and preservation. Since this is cultural heritage documentation and preservation, it is meaningless if the data is used only once immediately after acquisition. The data must be kept in a state that can be referenced and reused years or decades later, even after personnel changes.

3D data generally has large file sizes and multiple formats. Raw data, processed point clouds, meshed models, image data, cross‑sections, orthophotos, deliverables, and acquisition condition notes — related files tend to proliferate. If these are not organized, you may face issues where file names don’t reveal contents, it is unclear which is the official deliverable, the coordinate system is unknown, or processing history cannot be traced.

In the cultural heritage field, future personnel often were not present at the original site, so without recorded contemporaneous judgments and conditions, interpreting the data is difficult. You need to record in a form that can be understood later: what extent was targeted, where data is missing, where complementary parts were added, shooting or measuring dates, weather conditions, standards used, reference point locations, coordinate systems, rationale for scale, and correspondences with related photos and drawings.

Therefore, 3D recording should be considered not merely as model creation but as creating a record package. A record package is a set that includes the data itself plus surrounding information needed to interpret that data. If this is well organized, it is easier to utilize for future repairs, comparative studies, exhibition planning, or report preparation.

From a long‑term preservation viewpoint, it is also important not to be overly dependent on a specific viewing environment. If data can only be viewed in a proprietary environment, reuse barriers will increase over time. Decide from the outset who will store the data, which files are the authoritative originals, which are for sharing, how backups are handled, and the rules for updates.

The value of heritage documentation lies more in being able to retrieve it when needed than in the moment of creation. 3D data is no exception. Only by designing organization, naming, documentation, storage, and succession as part of the process will it function as a preservation record.

Basic 5: 3D Does Not Stand Alone — Its Value Increases When Combined with Photos, Drawings, and Written Records

When 3D attracts attention, traditional photography, drawings, and written records can sometimes seem outdated. However, in cultural heritage documentation and preservation, 3D rarely stands alone. Rather, 3D’s value grows when linked with photographs, drawings, written records, survey forms, ledgers, location information, and repair histories.

For example, a 3D model alone does not fully convey observations about material, hypotheses about causes of damage, past repair histories, investigator judgments, or correspondences with literature. While shape can be grasped visually, without interpretive context it remains mere three‑dimensional data. Conversely, parts whose positional relationships are difficult to convey in text alone become easier to understand when tied to 3D. Photographs supplement surface color, texture, and appearance of dirt; drawings organize necessary dimensions and representations; written records preserve background information and the rationale for judgments. This division of roles is crucial.

In practice, it is often easier to operate by positioning 3D as one of several materials rather than placing all other materials subordinate to 3D. For example, by standardizing survey or component numbers and enabling mutual reference among photos, drawings, point clouds, and written records, retrieval later becomes easier. For before‑and‑after repair comparisons, arranging 3D alongside close‑up photographs and descriptive records for the same components helps fulfill accountability.

Also, quick decisions are sometimes needed on site. Prioritizing simple photographic and positional records on the spot and performing detailed 3D acquisition only on critical areas is an effective approach. Attempting to complete everything with one method increases site load and can reduce overall record quality. The important thing is to create overlapping information. If you record in multiple formats, one format can compensate if another is insufficient.

To successfully introduce 3D, think not in terms of “replacing with 3D” but “strengthening existing records.” By adding 3D while leveraging photos, drawings, and written records, you can preserve the condition of cultural properties from multiple perspectives. This combined perspective creates a record system that is useful in practice.

Basic 6: Success Depends More on Operational Structure and Continuity Than on Equipment

When considering 3D introduction, attention naturally tends to focus on equipment and software. Tools are of course important. However, in cultural heritage documentation and preservation, what really makes the difference is not how new the equipment is but who operates it, what procedures are followed, and what rules govern operations. In other words, success is determined by system design and continuity.

For example, if only one person understands how to operate the equipment, operations may stop when that person is transferred or leaves. If acquisition rules are vague, quality varies between projects and comparability declines. If storage locations aren’t unified, related data for the same cultural property may scatter across multiple places and become hard to find. If deliverables from outsourced work lack acceptance criteria or delivery rules, they will not accumulate effectively within the organization.

Therefore, in the early stages of introduction, what you should establish is the workflow rather than the operation manual alone. Decide which projects will use 3D, who will decide, what to check before acquisition, minimum on‑site requirements, what the deliverable structure should be, how to link with photos and reports, and who bears storage responsibility.

Also, a tip for continuity is not to try to make everything sophisticated from the beginning. In heritage work, practices that cannot run smoothly within daily operations will not take root. It is more realistic to start by narrowing targets, introducing 3D for cases with relatively high necessity, and standardizing through practice. For example, begin with cases prone to record omission, cases with high value from linking to location information, or cases likely to require future comparison — doing so helps share 3D’s usefulness within the organization.

From the perspective of continuity, human resource development is also indispensable. Rather than relying solely on highly specialized technicians, it is preferable to have site staff capable of basic acquisition and checks and to be able to collaborate with specialists or external partners when needed. Cultural heritage documentation and preservation is not a temporary project but part of long‑term management.

Ultimately, introducing 3D is not about acquiring equipment but updating record‑keeping operations. Whether the organization can sustain the system determines success. Steady rule making yields greater long‑term impact than flashy demonstrations.

Conclusion

When asked whether 3D is necessary for cultural heritage documentation and preservation, the answer is not a simple yes or no. While not essential for all projects, 3D provides value that traditional methods may struggle to supplement in situations where shape, spatial relationships, condition comparison, and reusability are prioritized. What matters is making decisions from the perspective of preservation practice — what to preserve, how to use it, and how to pass it on — rather than adopting technology because it is trendy.

The six basics covered in this article form the foundation for such decisions. Use 3D to record condition rather than for appearance. Change methods according to the type of cultural property and purpose. Design accuracy to fit the intended use. Plan for post‑acquisition organization and long‑term preservation. Combine 3D with photos, drawings, and written records. Prioritize operational structure and continuity over equipment. Addressing these six points alone will greatly reduce failures in 3D implementation.

Going forward, the linkage between location information and 3D records will become increasingly important in cultural heritage documentation and preservation. Making clear where a record was acquired and improving on‑site reproducibility and comparability requires handling spatial information. As a practical means to advance such fieldwork, smartphone‑mounted high‑precision GNSS devices like LRTK are effective. They make it easier to record the investigation point, shooting position, and positional relationships of targets with high accuracy while linking these to 3D and photographic records, helping to balance precision and operability in record keeping. If you aim to develop 3D use for cultural heritage into a record infrastructure that can be handed down rather than mere visualization, consider including such positional information infrastructures to build a more practical and reusable preservation system.