What can point cloud data for cultural properties be used for? Explaining 6 use cases

The reason interest in point cloud data is rising in the field of cultural properties is not simply because it can be viewed in three dimensions. In practical work, great value lies in the ability to expand multiple purposes—preservation, investigation, repair, public access, education, and disaster prevention—from a single base dataset. Cultural property administrations and international organizations also note that proper recording of cultural heritage is important not only for everyday management but also as preparation for disasters and long-term environmental changes, and that three-dimensional data including point clouds form the basis for diverse deliverables such as 3D models, drawings, sections, and orthoimages. Furthermore, in Japan the digital archiving of cultural properties and museum collections is being promoted from the perspectives of preservation, inheritance, public access, and educational use.

Table of Contents

• Why point cloud data is attracting attention in the cultural property field

• Use case 1 High-precision current-state recording and long-term preservation

• Use case 2 Creating decision-making materials for repair and conservation work

• Use case 3 Advancing excavation surveys and academic research

• Use case 4 Development into exhibition, public access, and educational content

• Use case 5 Comparison after disasters/damage and support for restoration

• Use case 6 Tour guidance, on-site explanation, and integration with location information

• Practical points to note for successful use

• How to leverage point cloud data in the cultural property field

• Summary

Why point cloud data is attracting attention in the cultural property field

Point cloud data are three-dimensional data that record the surface geometry of an object as a collection of many points. They are characterized by being able to preserve building facades, stone walls, topographic undulations of remains, excavation situations, and terrain irregularities with a level of accuracy that photos alone cannot fully capture. In the cultural property world, the goal is not only to reproduce appearance attractively. There are always multiple requirements such as wanting to verify dimensions, compare deformation or damage, prepare for future repairs or restorations, and use materials for public access and education. For that reason, point cloud data are highly valued as a three-dimensional foundational dataset that can be repurposed later for different uses.

Especially for cultural properties, once damaged they often cannot be fully restored to their original condition. Preserving the current state at high accuracy itself becomes part of preservation. Materials from the Agency for Cultural Affairs also state that recording and storing high-resolution digital data can protect items from deterioration and weathering while enabling their use for restoration, reproduction, VR, AR, and more. In other words, point cloud data serve both as records for preservation and as a foundation for future use.

Moreover, cultural property practice deals with diverse targets: buildings, historic sites, gardens, stone objects, buried cultural properties, surrounding spaces of artworks and crafts, etc., and required accuracy and deliverables vary by target. Point cloud data are flexible enough to handle small objects to broad terrain, and they readily connect measurement-time visualization to cross-section confirmation, drawing creation, and three-dimensional modeling. That is why, for practitioners searching information under “cultural property point cloud data,” it is more important to understand what they can be used for and in which situations the investment will be effective than to debate whether to introduce them.

Use case 1 High-precision current-state recording and long-term preservation

The most basic and important use of point cloud data for cultural properties is recording the current condition. For example, recording the exterior and interior spaces of historic buildings, the shapes of stone walls and platforms, the topography of remains, and the surface condition of stone Buddhas and stelae as three-dimensional spatial information creates a fundamental resource that can be referenced into the future. While ordinary photographic records are visually easy to understand, they have limits in capturing depth-wise dimensions and overall shapes. With point cloud data, cross-sections or distances that were not anticipated at the time of measurement can be rechecked later.

In practice, this value is significant because the condition of cultural properties changes gradually over years. Wood deformation, surface wear of stone materials, terrain collapse, and changes in the surrounding environment can be hard to notice visually but become easier to detect by comparing with past data. If point cloud data are maintained with future comparability in mind rather than ending as a one-year survey result, the precision of continued management changes dramatically. Even if the person who recorded the data leaves the site due to transfer or retirement, the data themselves remain as an objective standard, which is particularly meaningful in public cultural property work.

Furthermore, point cloud data are an excellent entry for long-term preservation. Agency for Cultural Affairs materials indicate that the digital archiving of cultural properties and museum collections contributes to the preservation of physical items and disaster response, and also leads to continuity of activity records and expanded online use. It is not enough to simply store data on a server; organizing records of when, where, at what accuracy, and in which coordinate system the data were acquired increases their future reuse value. Point cloud data for cultural properties do not become assets the moment they are recorded; they become assets only after being organized and accumulated in a state that can be referenced.

Use case 2 Creating decision-making materials for repair and conservation work

The second use is creating decision-making materials for repair and conservation work. In cultural property repairs, it is important to objectively understand where, to what extent, and in which direction deterioration has occurred. Visual judgments by experienced technicians are of course important, but having shape and displacement captured as three-dimensional data increases the precision of discussions. For example, bulging of wall surfaces, bowed stonework, deformation of components, and the extent of surface loss can be shared as information with position and shape rather than as qualitative impressions.

Agency for Cultural Affairs research also states that acquiring accurate point cloud data for historic buildings aids generation of 3D and related models, structural analysis, architectural and archaeological analysis, and that research is progressing to better support inspection, diagnosis, and repair decision-making. This indicates that point cloud data are positioned not merely as visualization materials but as an evaluation basis preceding repair planning.

A common issue on conservation sites is that stakeholders view the subject at different granularities. Design staff want to see the overall layout, conservation staff want details of damaged parts, managers want to judge priorities, and contractors want to confirm work extents—so the information needed diverges. When point cloud data are used as a base, the same subject can be shared at different scales and viewpoints, increasing the resolution of meetings. Elevation differences and complex shapes that are hard to convey in plan view can be confirmed in three dimensions, reducing unnecessary misunderstandings.

Also, point cloud data suit future repair history management. If data are kept for pre-repair, during, and post-repair stages, it becomes easier to verify what interventions were made later. Cultural property care is not finished after a single repair; passing lessons to the next inspection and the next repair is essential. If past states are vague, the next person in charge must judge from scratch each time. With point cloud data, previous states can be compared in three dimensions, providing an information base that supports continuity of conservation work.

Use case 3 Advancing excavation surveys and academic research

The third use is advancing excavation surveys and academic research. On sites with buried cultural properties, it is necessary to accurately record the positional relationships of features and artifacts, fine terrain undulations, and stratigraphic changes within a limited period. Conventional drawing and photographic records will remain necessary, but using point cloud data together allows the site’s state to be preserved at higher density. Cross-sections can be cut and examined later, and the data can be reanalyzed for other research themes, so they become research assets that do not end as a single-year result.

Agency for Cultural Affairs materials on buried cultural properties also present the idea of combining multiple 3D measurement methods—airborne LiDAR, handheld or backpack laser scanning, GNSS surveying, photogrammetric 3D reconstruction from photos—while conducting field surveys, additional measurements, and result utilization. In other words, in the cultural property field point cloud data are organized not as rare advanced cases but as methods that can be integrated into routine terrain understanding and on-site surveys.

A major research advantage is that point cloud data support re-examination. Fine steps overlooked on site, boundaries with natural ground, characteristics of stone placement, traces of drainage, and so on can potentially be reinterpreted from another perspective later. Because an excavation site cannot be returned to its original state once dug, the density of recording influences academic value. With point cloud data, it becomes easier to reconfirm terrain continuity and section continuity that might not be apparent from planar photographs alone. This complements limited field time and is important for improving research reproducibility.

Furthermore, it is advantageous that wide-area terrain capture and local detailed recording are easy to link. If a workflow is established that moves from broad micro-topography capture to detailed measurement only where necessary, it becomes easier to set investigation priorities. When examining traces of terrain alteration or possibilities of buried structures, being able to go back and forth between overall topography and local data scrutiny is effective. Point cloud data thus become a means to rationalize the investigation plan itself rather than just a one-time site record.

Use case 4 Development into exhibition, public access, and educational content

The fourth use is development into exhibition, public access, and educational content. Many cultural properties cannot be approached, entered, touched, or moved for preservation reasons. Such restrictions are natural from the perspective of protection, but they leave the challenge of how to convey value to users. Point cloud data provide material to fill that gap. Spaces and objects recorded in three dimensions can be shown from different viewpoints, viewed from positions normally not accessible, and combined with explanations, making them easy to use.

Agency for Cultural Affairs materials state that recording and storing cultural properties as high-resolution digital data enables use for restoration, reproduction, VR, AR, and so on. The digital archiving of museum collections is also organized as leading to opportunities for users who cannot visit in person, continuity of activity records, and expanded use beyond geographic and temporal constraints. Internationally, initiatives continue to publish point clouds and 3D resources of cultural heritage as archives accessible to managers, researchers, students, and the general public.

In practice, this use is not only about presentation techniques. It is infrastructure development to improve the quality of exhibition interpretation, deepen regional understanding, and connect with education. For example, the shapes of remains that are hard to discern from the ground surface at a historic site can be explained using point clouds or 3D models, greatly changing visitors’ understanding. Architectural details and spatial composition that are not visible along usual circulation lines can be shown from otherwise unseen viewpoints. In school education, they are easy-to-use teaching materials for three-dimensional understanding of local cultural properties and fit well with regional learning and inquiry-based learning.

Furthermore, public use ties into regional promotion. The Agency for Cultural Affairs’ practical guide explains that publishing digital archives increases opportunities for residents to engage with the meaning of cultural resources through education and learning, fosters pride in local history and culture, contributes to cultural tourism and regional revitalization, and promotes research. Point cloud data should not be used simply because they look novel; they should be positioned as a means to open the value of cultural properties that are hard to convey to society in a more understandable way.

Use case 5 Comparison after disasters/damage and support for restoration

The fifth use is comparison after disasters or damage and support for restoration. Cultural properties face various risks such as earthquakes, heavy rain, landslides, fires, aging, and changes in the surrounding environment. If you try to record damage after an incident without having pre-disaster records, it is difficult to accurately determine where and how much change has occurred. This is why maintaining point cloud data during normal times is important. If pre- and post-disaster comparisons can be made, it becomes easier to grasp the extent of deformation, prioritize emergency responses, and consider restoration policies.

UNESCO also states that appropriate documentation of cultural heritage is essential not only for emergencies but also for routine management and preparedness, and that digital technologies including point clouds can provide foundational data for emergency intervention planning, long-term monitoring, and education/awareness-raising. Domestically as well, digital archiving is regarded as contributing to disaster response. In other words, point cloud data are both research materials in normal times and preparedness resources in emergencies.

The essence of this use is not just restoring appearance for the sake of appearance. When deciding what should be protected as a cultural property and how far to intervene, objective pre-disaster information is required. Elevation differences, tilts, shape changes, and component positions that are difficult to judge from photos alone become easier to compare with point cloud data. For features such as stone walls, terrain, and building envelopes—where the degree of deformation is often decisive in discussions—three-dimensional data become the common decision-making basis.

From a disaster prevention perspective, it is meaningful not only for post-damage use but also for pre-damage risk assessment. Regularly recording and comparing time series of areas prone to displacement, terrain where rainwater flow concentrates, and surroundings of hard-to-see cracks makes it easier to revise preservation plan priorities. Point cloud data for cultural properties should be viewed not as data for post-damage cleanup but as a preventive information base to reduce damage.

Use case 6 Tour guidance, on-site explanation, and integration with location information

The sixth use is tour guidance, on-site explanations, and integration with location information. When people think of using cultural properties, many may imagine indoor exhibits or publishing digital archives, but point cloud data are also effective for enhancing on-site experiential value. For example, retaining on-site terrain and feature shapes as point cloud data and using them for explanatory displays, spatial reconstructions, and route guidance makes it easier to overlay visible scenery with invisible historical information.

The Agency for Cultural Affairs’ handbook introduces that combining location information measurement with cultural property utilization enables promotion of tours and on-site information dissemination. Point cloud data alone cannot provide current-location guidance, but when combined with location information, they can intuitively convey which feature a user is looking at, and what the terrain or structures used to be like depending on where the user stands. This is particularly effective for large historic sites, park-converted ruins, and areas where cultural properties are dispersed across multiple locations.

In practice, this use matters because the value of cultural properties is often best conveyed on site. However, in reality there are challenges: remains may blend with the ground surface and be hard to see, access restrictions prevent close approach, and explanation panels alone may not make shapes easy to imagine. If terrain undulations and structural outlines are visualized from point cloud data and linked to on-site location information, visitors can more easily understand “where to look.” This is not merely navigation but an enhancement of on-site interpretation that supports understanding.

Moreover, it aligns well with future maintenance. If the location-information infrastructure used for on-site guidance is established, it becomes easier to link survey records, inspection records, photo records, and 3D data as information tied to the same place. A system prepared for public use can directly improve the referencability of management ledgers and inspection histories. Successful use of point cloud data for cultural properties depends not on choosing preservation or utilization, but on whether place-linked information can be handled integrally.

Practical points to note for successful use

We have reviewed use cases so far, but point cloud data are not readily usable simply by obtaining them. A common practical failure is deciding on measurement methods before clarifying objectives. For example, whether the purpose is preservation recording, repair decision-making, or content for public access determines required accuracy, allowable measurement omission, need for color, importance of coordinate referencing, and the format of deliverables. If measurements are made with ambiguous objectives, problems often arise later such as inability to cut the desired cross-sections, insufficient density in necessary parts, or positions that do not align with other data.

The second point is operational design. If you do not decide who will store the data, who will update them, which naming conventions to use, and at what unit they will be published, reuse several years later will become difficult. Agency for Cultural Affairs materials also emphasize long-term stable management of digital archives, recording management status, distributing storage locations, and regular media migration. Point cloud data for cultural properties tend to become large, and management by an individual in charge cannot ensure continuity. It is necessary to design from the introduction stage where responsibility—municipality, museum, or survey entity—will be placed.

The third point is organizing the scope of disclosure. For some cultural properties, detailed data cannot be published without restriction for reasons of crime prevention, protection, rights, or local circumstances. On the other hand, if nothing is published, the societal value of the data will not be conveyed. Therefore, it is important to categorize raw data, internal-use data, educational-use data, and general-public data in stages and decide in advance what to release and to what extent. To balance preservation and use, a practical approach is not full disclosure or full non-disclosure but organization according to intended use.

The fourth point is handling coordinates and on-site information. For point cloud data of cultural properties, clarity about what location was recorded is more important than how beautifully the data look on their own. Especially for wide-area historic sites and measurements spanning multiple years, coordinate consistency, relationships with control points, and correlation with photos and drawings determine the efficiency of later use. For research, repair, public access, or disaster prevention, three-dimensional data with vague positions will have limited value. To make point cloud data for cultural properties truly usable assets, it is important not to separate geometry data from location information.

How to leverage point cloud data in the cultural property field

To advance point cloud data use on the ground, it is also important not to assume only large-scale, highly advanced measurements. Of course, some targets require high-density laser scanning and specialized analysis. But in practice you cannot apply the same effort to every cultural property. That is why it is important to first clarify the places that should be recorded, ensure required location information is reliably captured, and keep data in a form that facilitates later comparison and sharing.

In particular, during the initial phase of a field survey, the ability to quickly grasp where you recorded, how it links with existing drawings and photos, and where additional measurement is needed determines subsequent efficiency. In cultural property practice, not only measurement accuracy itself but also ease of handling on site, consistency of records, and ease of sharing are equally important. Because the scope of point cloud data use is wide, there is great value in simplifying entry tasks such as position recording and on-site coordinate acquisition.

In that sense, when aiming to make on-site recording more practical, systems such as LRTK—smartphone-attached GNSS high-precision positioning devices—are promising. For large historic sites and outdoor cultural property surveys, performing photos, simple surveying, and position confirmation separately increases workload and post-processing burden. If positions can be recorded on site at high accuracy, point cloud data, photos, and survey notes can be handled in the same coordinate context, improving later organization, comparison, and sharing efficiency. As a preliminary step before fully deploying point cloud data use, accumulating reliable on-site position records has significant value.

Summary

Point cloud data for cultural properties are not flashy technology merely for three-dimensional display. They are foundational data that crosscut many practical situations: high-precision current-state recording and long-term preservation, decision-making materials for repair and conservation, advancement of excavation surveys and research, development into exhibition and education, comparison and restoration support in disasters, and tour guidance with location information integration. The important thing is not to make data collection itself the goal. Only by organizing why you record, who will use it and how, and how to link it with location information and existing materials does point cloud data become a living asset for cultural properties.

And if you aim for truly usable data operation in the cultural property field, the key is how reliably, feasibly, and continuously you can conduct the initial on-site recordings. The more you envision advanced uses of point cloud data, the more important on-site position recording and coordinate management become. If you want to build a practical foundation that balances preservation and utilization of cultural properties, beginning by using smartphone-attached GNSS high-precision positioning devices such as LRTK to improve the accuracy and efficiency of on-site coordinate confirmation and simple surveying is also effective. Being able to secure accurate positions on site raises the overall future quality of point cloud data use.