3D scanning firm completes full digital record of Japan's Odawara Castle

Using a combination of three scanning systems to produce a single, continuous point cloud, a team of 3D scanning engineers has completed a comprehensive digital survey of Odawara Castle. This is one of Japan's most storied feudal landmarks, with the perimeter stretching a total of nine kilometres.

The project, carried out by Artec 3D's support team during a trade mission to Japan, was designed to create a lasting digital record of the castle for heritage preservation and future restoration work. Built more than 500 years ago during the Kamakura period, the era that gave rise to Japan's first Shogun, the site has endured centuries of conflict, seismic damage and partial demolition. It was only formally protected as a heritage site in 1938.

Efficient approach

The central challenge was one of scale. Odawara Castle is both a national landmark and an active visitor attraction, meaning the team had to work quickly and unobtrusively. Rather than relying on tripod-mounted equipment, engineers mounted the primary scanner, Artec's Jet system, to a backpack and walked the grounds much like any other visitor, capturing the full site from ground level at a range of up to 300 metres.

Keynan Tenenboim, a scanning expert at Artec 3D, described the efficiency of the approach: "Artec Jet scans in a linear fashion. If it takes you two minutes to walk, it'll take two minutes to scan – the complexity of the scene has little bearing. In the same time it took for Leo to scan two to three walls, Ray II scanned a building, and Jet digitized an entire castle."

For sections requiring greater precision, including the inner courtyard, entrance gate and a nearby mediaeval wall, the team supplemented Jet's wide-area capture with Artec's Ray II terrestrial scanner and Leo handheld unit. The combination allowed fine surface details such as tile patterns, ironwork rivets and carved lettering to be recorded in full.

Tenenboim noted that no single scanner would have been sufficient alone. The castle's layout offered no clear vantage point from which its main facade could be captured at distance, ruling out a purely static approach. Jet's range solved that problem by eliminating the need for scaffolding or elevated platforms, though he acknowledged that drone deployment could further improve roof coverage in future surveys.

From point cloud to preservation tool

Raw data was transferred to Artec's Luxembourg headquarters via cloud sharing for processing in Artec Twins, the company's software platform for handling large-scale scan datasets. The output is a high-density, navigable point cloud that can be merged into a full 3D mesh and exported to architectural platforms such as Autodesk Revit.

Possible applications include virtual museum experiences allowing remote visitors to explore the castle in three dimensions, and a baseline dataset against which future surveys can be compared to detect structural changes over time. Routine monitoring of this kind could support faster responses to deterioration, such as sagging in the castle's traditional timber rooflines.

The Odawara project reflects a broader push by heritage authorities and cultural institutions to establish permanent digital records of at-risk sites before damage or decay occurs. It also illustrates how commercial scanning technology developed for industrial and construction use is increasingly finding application in cultural preservation.