The Smithsonian Institution is making significant strides in preserving history through its innovative 3D Digitization Program. The program, which incorporates cutting-edge lidar (light detection and ranging) technology, photogrammetry, and structured light scanning, is reshaping how museums preserve, share, and interact with their vast collections. From ancient fossils to space-age artifacts, this initiative is revolutionizing the way the public can access and explore objects in the Smithsonian’s holdings, all from the comfort of their own homes or research labs.
Lidar Technology: A Precise Tool for Capturing History
Lidar lies at the core of the Smithsonian’s 3D digitization efforts. Tripod-mounted terrestrial lidar scanners (TLS) can create precise point clouds that accurately reflect the shape and size of an object. This level of detail is essential for historical preservation, ensuring that even the smallest features are accurately recorded.
While the Smithsonian has not publicly disclosed all the specific scanners they use, a high-precision lidar scanner, such as the Surphaser HSX100, would be well-suited for capturing detailed scans of large artifacts with geometric accuracy. The ability of TLS lidar to provide precise 3D models makes it an ideal choice for large or intricately detailed objects like a FULL woolly mammoth skeleton! A mammoth includes not only large bones but also many smaller, spatially complex bones that require high precision to capture their position in 3D space.
Credit to The Smithsonian Institute: https://3d.si.edu/object/3d/mammuthus-primigenius-blumbach:341c96cd-f967-4540-8ed1-d3fc56d31f12.
Photogrammetry: Enhancing Detail with Camera-Based Imaging
Photogrammetry adds an additional layer of richness to digital models. Photogrammetry uses high-resolution cameras to capture overlapping images of an object from multiple angles. Software then processes these images to create detailed 3D models. While lidar is excellent at creating a 3D mesh of an object, it doesn’t capture finer details like color gradients.
By combining lidar data with photogrammetry, the Smithsonian can generate fully textured models that are both geometrically accurate and visually rich, offering a more lifelike representation of artifacts. This is especially important for objects like sculptures, textiles, and other items with complex surface features that require high-fidelity texture mapping.
Structured Light Scanning: Capturing Fine Details
Structured light scanning is another critical technology likely employed by the Smithsonian for digitizing artifacts with exceptional precision. Structured light scanners project a series of light patterns, usually stripes or grids, onto an object. As the light deforms when it hits the surface of the object, cameras capture these distortions and use them to calculate the shape of the object in 3D space.
Structured light scanning excels in capturing fine surface details and is often used for smaller objects or delicate artifacts that require careful attention to detail. For instance, the Smithsonian used structured light scanning to digitize ancient clay tablets (used to file one of the first documented complaints) and other smaller items that might be too complex or fragile for traditional lidar scanning.
Expanding Access
The Smithsonian’s use of lidar, photogrammetry, and structured light scanning has fundamentally transformed its workflows. Conservators are now able to monitor the condition of artifacts more effectively by comparing digital scans taken over time. These scans provide detailed records of an artifact’s physical condition, allowing for early detection of wear and tear or environmental damage. This proactive approach to preservation is critical in maintaining the Smithsonian’s vast collection for future generations.
Curators are also using 3D models to enhance exhibits and provide visitors with interactive, immersive experiences. Digital models allow museum-goers to zoom in on artifacts, rotate them, and explore them in detail, something that would be impossible with physical objects due to their fragility or size.
3D Printing
3D printing plays a key role in the Smithsonian’s digitization efforts by turning detailed 3D models into tangible replicas of historical objects. This allows educators, researchers, and the public to interact with accurate, scaled-down versions of artifacts they might never get to see in person. It also helps preserve delicate items by creating replicas that can be handled and studied without risking damage to the originals.
Preserving the Past for the Future
The Smithsonian’s 3D Digitization Program is preserving the past with remarkable accuracy. By making these objects accessible in new and innovative ways, the Smithsonian is enabling a deeper understanding of history while ensuring that these stories remain alive for years to come. Whether you want a 3D-printed life-size model of Neil Armstrong’s spacesuit in your living room or a replica of the first documented complaint, a 3,700-year-old clay tablet, to give to your coworkers when they get on your nerves, the Smithsonian has you covered.
Check out the Library of 3D Scans HERE!: https://3d.si.edu/
