What can 3D measurement of Important Cultural Properties do? 7 application examples explained

In practical work related to the preservation and use of Important Cultural Properties, how accurately the current conditions of buildings, structures, sculptures, stone works, gates, walls, and garden components are understood and how well that information can be shared among stakeholders greatly affects subsequent decision-making. Traditionally, it has been common to manage these assets by combining photographs, measured drawings, inspection reports, and repair records, but in recent years 3D surveying has been added, and efforts to record current conditions more precisely and in three dimensions have been progressing.

Many people who search for "3D measurement of Important Cultural Properties" are not simply aiming to create 3D data itself; they want to know what it is useful for, how far it can be applied in practice, and what results can be achieved by introducing it. In fact, 3D measurement for Important Cultural Properties is not limited to producing visually appealing 3D models. It demonstrates value in a wide range of situations, such as examining repair plans, comparing changes over time, providing documentation for post-disaster recovery, public use, and building consensus among stakeholders.

Furthermore, for Important Cultural Properties, unlike ordinary buildings or infrastructure, it is often difficult to confirm conditions by dismantling, and there are many cases in which contact itself should be avoided as much as possible. For that reason, non-contact 3D measurement that can capture shape is a technique well suited to the characteristics of cultural properties. On the other hand, simply "converting to 3D" does not guarantee reassurance; unless you consider the measurement range according to your objectives, the required accuracy, the types of deliverables, and the methods of operation, even if you obtain data you may not be able to make full use of it.

In this article, we explain concretely what can be done with 3D measurement of Important Cultural Properties, broken down into seven application examples that are easy to visualize in practical work. In addition, we organize the concepts to keep in mind when introducing the technology and the steps for translating results into everyday practice. We focus on perspectives used on-site so the content can serve as decision-making material for those involved in preservation, repair, exhibition, or management.

Table of Contents

• Reasons why 3D measurement is required for Important Cultural Properties

• Main deliverables obtained from 3D surveying of Important Cultural Properties

• Use case 1: Preserve the current state in three dimensions with high precision

• Use Case 2 Comparing Age-Related Changes and Deterioration

• Use Case 3: Informing considerations of repairs and preservation maintenance

• Use Case 4: Prepare as recovery documentation for disasters and accidents

• Use Case 5: Expanding into public use and exhibition planning

• Use Case 6: Promoting Sharing and Consensus Building Among Stakeholders

• Use case 7: Support management planning that includes the surrounding environment

• How to Successfully Conduct 3D Measurement of Important Cultural Properties in Professional Practice

• Summary

Why 3D Measurement Is Required for Important Cultural Properties

In the preservation of Important Cultural Properties, protecting the actual object is the highest priority. However, in practical fieldwork, it is precisely to protect the object that it is necessary to accurately understand its current condition. For example, there is a great deal of information important for conservation: roof sagging, leaning of pillars, unevenness of wall surfaces, wear on stone surfaces, loss of fine details in carvings, settlement of floors and plinths, and differences in elevation relative to the surrounding ground. It is difficult to fully grasp these from photographs alone, and plan drawings alone can make their three-dimensional relationships hard to see.

The strength of 3D measurement is that it can preserve an object's shape and positional relationships as spatial information. Rather than relying on a single photograph or fragmented dimensions, it treats the entire space as a single foundational dataset, allowing you to cut cross-sections later to inspect, zoom in on arbitrary areas, or overlay and compare data from different times. In other words, it not only improves the quality of understanding current conditions, but also increases the information available for decisions about preservation and utilization.

Another characteristic of surveys of Important Cultural Properties is the large number of stakeholders involved. Not only owners and managers, but also those responsible for conservation and repair design, construction personnel, researchers, administrative officials, and exhibition staff—people with different roles—may convene to discuss the same object. In such cases, having 3D data makes it easier to share shapes and spatial relationships that are difficult to convey with words alone. A major advantage is that those familiar with drawings can view cross-sections and dimensional information, while non-specialists can be shown a three-dimensional visualization.

Moreover, Important Cultural Properties include elements that cannot be restored once damaged. For that reason, it is especially important to create highly accurate records during normal times. Situations in which records will be needed inevitably arise later—for future repairs, disaster response, insurance and recovery policy deliberations, academic research, and explanations to local communities. To avoid finding oneself thinking “We should have measured it more thoroughly” at that time, 3D measurement is gaining attention as a foundation for preservation.

Main Deliverables Obtained from 3D Surveying of Important Cultural Properties

When it comes to 3D measurement of Important Cultural Properties, people often imagine only the finished 3D model, but the actual deliverables are much broader and are used according to their purpose. One of the most common is point cloud data. A point cloud records the object's surface as a collection of many points and can preserve the current condition at high density, making it the basis for shape analysis, dimensional verification, and creating cross-sections. It is also effective when you want to retain fine surface irregularities and distortions.

Next, there are 3D models that reproduce the appearance of surfaces by combining photographs, and textured three-dimensional representations. These are useful for exhibitions, presentations, and review meeting materials, and help verify surface color and texture in addition to shape. Furthermore, 3D data can be used to produce 2D deliverables such as orthophotos, plans, elevations, sections, and development drawings. Because demand for 2D drawings remains high on site, 3D measurement rather contributes to improving the accuracy of 2D drawing production.

By associating coordinates with measurements, they can be managed in combination with surrounding topography, site boundaries, circulation routes, drainage, temporary construction plans, and so on. The ability to treat them not only as standalone cultural properties but as spatial information that includes their surrounding environment is extremely important when considering maintenance and conservation.

In this way, 3D measurement of Important Cultural Properties is not about 'creating a 3D model' as the goal. Because it can be developed into a variety of deliverables—point clouds, drawings, comparative materials, explanatory visuals, coordinate-referenced base data, and so on—it can be widely used across preservation, repair, public display, and management tasks.

Use Case 1 High-precision 3D Preservation of Existing Conditions

The most fundamental and important approach is preservation of the current condition. Important Cultural Properties have value in their present appearance itself. The current condition—including not only the original design at the time of construction but also long-term maintenance and repair history and changes due to aging—serves as the basis for future preservation decisions. Therefore, it is important to record the condition at a given point in time as objectively as possible.

By using 3D measurement, you can record in three dimensions information that is difficult to grasp from photos alone—such as roof warping, eaves overhang, slight tilts of columns and beams, uneven stone steps, wall bulging, and surface abrasion of sculptures. Moreover, because you can later create cross-sections at required positions or measure relationships between distant parts, it becomes easier to carry out verification work without having to re-enter the site.

Preserving the current condition is especially effective when there are no immediate plans for repairs. Even if there are no major construction plans at present, keeping 3D data as a baseline record for the future allows you to compare with past conditions if a defect is discovered several years later. A conventional photo log may only preserve "what was visible at the time," whereas 3D measurement provides the value of being able to verify from the "viewpoint you want to see later."

Important Cultural Properties age over time under the influence of multiple factors, such as visitor circulation, the growth of surrounding trees, changes in drainage conditions, and subtle settlement. Precisely for that reason, preserving the three-dimensional state of a space at a given point in time is equivalent to having a starting point for conservation. Preservation of the current condition may appear modest, but it serves as the starting point for all future uses.

Use Case 2: Comparing Changes Over Time and Deterioration

One highly practical application in the management of Important Cultural Properties is comparing data acquired at different times to identify changes. Progression of cracks, changes in tilt, widening of surface wear, settlement of foundations, bulging of stone walls, and deformation of wooden components—such condition changes can be difficult to assess from a single observation. In particular, changes that progress gradually day by day can be overlooked if one relies solely on the on-site staff’s sense.

By regularly acquiring 3D measurement data, you can compare the same locations over time. This makes it easier to spatially grasp which positions have changed and by how much, rather than relying on a vague impression of “it feels worse than before.” When considering the need for preservation and repair, being able to show whether changes have occurred and their progression strengthens the persuasive power of the evidence for decision-making.

This application is particularly effective for important cultural properties located outdoors. For objects that are susceptible to external factors such as wind and rain, changes in temperature and humidity, earthquakes, snowfall, contact from visitors, and the influence of vegetation, it is important to have a system in place that can track changes even in normal times. 3D measurement is valuable not as a one-off record but because it can be used as a monitoring platform.

Moreover, comparative analysis of changes is also effective for post-repair verification. If differences in shape before and after repair, the fitting of reinforcement areas, and changes in surface appearance can be confirmed, the quality of the construction record will be improved. In conservation repairs, it is important not only to record what was repaired and how, but also to leave to posterity what the repaired result was. In that sense, comparable 3D data raises the quality of long-term management.

Use Case 3: Informing repair and preservation maintenance planning

In repairs and conservation of Important Cultural Properties, the accuracy of preliminary surveys determines the quality of the planning. The more complex an object's geometry is, the more frequently situations arise where existing drawings alone are insufficient. Conducting 3D measurements therefore allows you to extract the information needed at the planning stage from multiple perspectives.

For example, for buildings you can grasp in three dimensions the shapes of eaves and roofs, offsets of column centers, floor level differences, the positional relationships of openings, and how members intersect. Even when stonework or monument-like elements are included, it becomes easier to check surface conditions, their relationship with foundations, and their connection to the surrounding ground. This in turn makes it easier to proceed more realistically with defining the scope of repairs, considering scaffolding and temporary works, anticipating construction procedures, and identifying hazardous locations.

Also, because elevations and sectional drawings can be generated from 3D data with high accuracy, it helps streamline the preparation of drawings. In the restoration of cultural heritage, irregular shapes are not uncommon. Creating drawings from scratch by hand is time-consuming, and omissions in measurements can become problems later. By using 3D measurement as a foundation, it becomes easier to create additional required drawings and to accommodate design changes or rework.

Furthermore, in considering preservation and maintenance, not only the object itself but also its relationship with the surrounding spaces is important. It is necessary to confirm coordination with the surroundings—visitor circulation routes, the placement of explanatory panels, barrier-free routes, temporary walkways, drainage planning, and the distance to plantings. 3D measurement aids examination of the entire space, so it serves as a foundation for planning support rather than merely a recording task.

Use Case 4 Preparing recovery documentation for disasters and accidents

One critical aspect not to be overlooked in the preservation of Important Cultural Properties is preparedness for disasters and accidents. Earthquakes, heavy rain, typhoons, debris flows, fires, fallen trees, falling objects, accidental collisions—unexpected events can occur at any time. It is not uncommon, after damage has occurred, to realize that the original condition should have been recorded more accurately.

If 3D measurement data are available beforehand, you can objectively confirm the pre-disaster shapes and positional relationships. This is extremely important when drawing up restoration plans. For example, it can be used to determine which component was in which position, what the relative positions of stones and other elements were, and whether surface damage is new or pre-existing. Photographs alone have limitations for interpreting depth and dimensions, but 3D data can be referenced as spatial information.

Also, if overlaid with data acquired after the disaster, it helps to grasp the extent of the damage. Which parts have shifted and by how much, the extent of displacement due to subsidence or collapse, and how to prioritize restoration — these all inform emergency response decisions. For important cultural properties, mistakes in initial judgments can increase the difficulty of later repairs, so maintaining records during normal times is not merely archiving but crisis management itself.

Furthermore, in disaster response, stakeholders must gather quickly and determine a course of action while sharing situational information. With 3D data, explanations can be given that show the differences before and after damage, supporting rapid decision-making. In the preservation of important cultural properties, 3D measurements taken during peacetime not only have an insurance-like significance but can also be regarded as a practical asset that influences the quality and speed of restoration.

Use Case 5: Expanding into Public Use and Exhibition Planning

3D measurement of Important Cultural Properties is not used only for preservation and repair. It is also highly effective as a means of expanding public use and exhibition planning. Parts that can only be seen by visiting the site, areas with restricted access, and parts that are difficult to observe because they are high up or in confined spaces can be more easily conveyed to visitors and stakeholders if 3D data is available.

For example, decorative elements on roofs that are normally inaccessible, ceiling‑level structures, the depth of interior spaces, and fine surface carvings can be explained using three-dimensional displays and cross-sectional views. This approach is easy to apply not only to explanations in exhibition facilities but also to school education, community learning, raising awareness of preservation activities, and informational materials about donations and support. The value of Important Cultural Properties is supported not only by the physical presence of the objects themselves but also by how that value is communicated to society.

Also, creating clear illustrations and videos based on 3D measurement data makes it easier for visitors without specialized knowledge to understand. Because you can visually indicate which parts are later additions, which are older elements, how the structure is formed, and which areas were treated during repairs, the quality of the explanations improves. This also makes it easier to foster an understanding of the conservation activities for cultural properties themselves.

In the public display of Important Cultural Properties, it is essential to balance that with protection of the original object. You cannot allow people to approach without limit simply because you want to show them. In that respect, public presentation using 3D measurement data is a method that can broaden the range of information provided without increasing the burden on the original object. As a foundation for making preservation and public display compatible rather than opposed, 3D measurement is a highly suitable technique.

Use Case 6: Promoting Sharing and Consensus Building Among Stakeholders

In work related to Important Cultural Properties, the points that should be considered differ by stakeholder. Those who prioritize preservation, those who carry out construction, those who plan for public use, and those responsible for management and operation focus on different aspects even when looking at the same subject. For that reason, discrepancies in understanding easily arise at each consultation, and the quality of discussions can vary greatly depending on how the materials are prepared.

3D measurement data has the advantage of readily serving as a common foundation for reducing such misalignments in understanding. Spatial relationships that are difficult to grasp from drawings alone become easier to share when visualized in 3D, and conversely, for detailed examination they can be interpreted as cross-sections and dimensions. In other words, it can be presented in a format that is easy to explain to both experts and non-experts.

For example, when explaining the scope of repairs, you can display the target parts in 3D while confirming their relationship to the surrounding areas. When explaining temporary construction plans, it becomes easier to visually communicate delivery routes, scaffold locations, and whether work interference will occur. When considering maintenance open to the public, stakeholders can more easily share viewing routes and what is visible from viewpoints. All of these are valuable not as visually appealing materials for meetings, but as a common language necessary for building consensus.

Furthermore, even when personnel change, if 3D data remains it becomes easier to transfer information. The management of cultural heritage is not something that ends in the short term; it is handed down over the long term. Being able to inherit spatial information that is difficult to convey with photographs and documents through 3D measurement is a major advantage in terms of reducing future operational burden.

Use Case 7: Supporting management planning that includes the surrounding environment

To protect Important Cultural Properties, it is not enough to look only at the property itself. They must be managed with consideration of their relationship to the external environment—such as surrounding topography, differences in elevation within the site, drainage routes, approach paths and walkways, the positions of trees, adjacent structures, visitor circulation, and obstacles to security. In particular, for Important Cultural Properties located outdoors or for cultural properties that include grounds, surrounding conditions have a major impact on their state of preservation.

If 3D measurements are expanded to include the surrounding environment, issues that were not apparent from the object alone become visible. For example, low-lying terrain where rainwater tends to collect, circulation routes where visitors are likely to get too close, trees and structures that are likely to interfere during temporary installations, and delivery access routes that are difficult for vehicles to enter. Although these are not direct targets of conservation and repair, they are very important considerations in practice.

Also, if 3D data that includes the surrounding environment is available, it will be useful for examining future maintenance policies. It becomes easier, based on current conditions, to consider the location of interpretive facilities, the placement of safety fences, signage plans, drainage improvements, lighting installation, and the review of inspection routes. Because the preservation of Important Cultural Properties must be supported not only by protecting the individual asset but also by addressing both environmental and operational aspects, 3D surveying that includes the surroundings improves the accuracy of management plans.

If you record the surroundings with coordinates, it will be easier to link them with future additional surveys or supplementary measurements. By using previously acquired data as a foundation and adding measurements only where necessary, you can update incrementally, making it easier to build a system suited to continuous management. 3D measurement of Important Cultural Properties should be regarded not as a one-time recording of the object but as an approach to establishing spatial infrastructure for long-term management.

How to Successfully Implement 3D Measurement of Important Cultural Properties in Practice

So far we have introduced seven use cases, but to actually achieve results the approach before measurement is important. The first thing to establish is why you are conducting 3D measurements. Whether the primary objective is preserving the current condition, obtaining baseline data for repair design, or considering use for exhibition will change the required accuracy, scope, and deliverables. If you proceed with an unclear purpose, you are likely to collect data that is either insufficient or excessive, making it difficult to use later.

The next important point is to consider the measurement range, including not only the object of interest but also its surroundings. For Important Cultural Properties, there are many situations where judgments must include not only the object's appearance and structure but also the surrounding ground, wiring, drainage, and temporary installation conditions. If you clarify in advance how far things should be treated as a single unit, the resulting data will more readily be useful in later stages.

Furthermore, designing the deliverables is indispensable. Deciding in advance whether you need point clouds, 2D drawings, or visualization materials for explanation makes it easier to determine the post-acquisition processing strategy. Especially for Important Cultural Properties, the materials required differ among preservation managers, design personnel, construction personnel, and public outreach personnel, so it is important to clarify who will use what.

In terms of on-site operations, it is important to avoid physical contact with the subject, ensure the safety of visitors and nearby users, check weather and lighting conditions, and coordinate with relevant parties as necessary. In cultural heritage surveys, careful preparation and planning influence outcomes even more than at typical building sites. 3D measurement is an advanced technique, but one must not forget that how well objectives are defined and operations are designed has a far greater impact on the results than the measurement itself.

Another important point is not to let the acquired 3D data sit unused. Once captured, the data can be reused for a variety of tasks—not only for repairs but also for routine inspections, preparing explanatory materials, disaster response, and consideration of surrounding maintenance. To enable this, it is effective to plan in advance for coordinate management, naming rules, storage methods, and update policies. Practical 3D measurement is not finished once the data is acquired; it means creating a state in which the data can continue to be used.

Summary

What 3D measurement of Important Cultural Properties can achieve is not mere three-dimensionalization. From preserving the current condition with high precision, comparing changes over time and deformations, informing the planning of repairs and conservation maintenance, serving as recovery documentation in case of disasters or accidents, developing public use and exhibition planning, facilitating sharing and consensus-building among stakeholders, to even contributing to management plans that include the surrounding environment, it offers a wide range of practical value directly applicable to professional work.

For Important Cultural Properties in particular, it is important to record information while minimizing impact on the original object and to establish a foundation that can be used over the long term. 3D measurement is a powerful means for this purpose and can serve as a common platform linking conservation, repair, exhibition, and management. For any use, the key is to measure with the accuracy and scope appropriate to the purpose and to design the deliverables with subsequent operations in mind.

In addition to high-density 3D documentation of the Important Cultural Property itself, accurately capturing positional information for the surrounding site, circulation routes, control points, related facilities, and temporary construction plans will significantly improve the overall coordination of the work. To develop 3D data into spatial information that can be used on-site, proper handling of coordinates and supplementary on-site surveying are indispensable.

In such situations, using LRTK — a GNSS high-precision positioning device that can be attached to an iPhone — makes it easier to obtain on-site location information, perform supplementary surveying, record surrounding facilities, and align with 3D data. By combining precise 3D measurement of the Important Cultural Property itself with agile acquisition of location information that includes the surrounding site, it becomes easier to practically organize the spatial information needed for preservation and use. To develop 3D measurements of Important Cultural Properties into assets that can be used continuously rather than ending as one-off records, there is considerable value in also considering field-friendly measurement methods like LRTK.