Digital heritage is the use of digital technologies to document, preserve, and provide access to cultural places, objects, and traditions — from photogrammetric 3D models of buildings at risk to virtual tours that open closed or destroyed sites to anyone with a screen. It is both a conservation discipline and a new form of public access. This is a short guide from Cultural Heritage Online.
What counts as digital heritage
The term covers two related but distinct things. First: the digital documentation of physical heritage — 3D scanning, photogrammetry, high-resolution imaging, and GIS mapping used to record built structures, archaeological sites, artworks, and landscapes. Second: born-digital heritage — websites, digital art, social media archives, and software that are themselves cultural artefacts and face their own preservation challenges. UNESCO’s 2003 Charter on the Preservation of the Digital Heritage addresses the second category; the 1972 World Heritage Convention, as interpreted for digital recording, covers the first.
How physical heritage is digitised
The main techniques for recording three-dimensional structures and sites are:
- Photogrammetry. Hundreds of overlapping photographs, processed by software, generate a textured 3D mesh. Accessible with a camera and open-source software; the standard method for smaller objects and buildings.
- LiDAR scanning. A laser measures millions of distances per second to produce a high-density point cloud of the subject’s geometry. Faster than photogrammetry for large structures; used for entire buildings, sites, and — from aircraft — landscapes under dense vegetation (as at the Maya sites of Caracol and Lidar-discovered cities in Mexico).
- Structure from Motion (SfM). A computational method that derives 3D structure from 2D images taken from multiple positions; overlaps with photogrammetry in practice.
Virtual access: what it can and cannot do
A virtual tour of a heritage site — whether a 360-degree photo sequence, a game-engine walkthrough of a reconstructed city, or a flat video — gives access to places that are closed, inaccessible, or destroyed. The Cyrene Project has reconstructed ancient Roman Cyrene (Libya) from archive photographs; Poland’s Virtual Shtetl documents 400 destroyed Jewish communities. For living sites, virtual access complements rather than replaces the physical visit: it introduces the site to people who have not yet visited and serves those who cannot travel.
CHO documents more than a thousand place_cards linked to virtual-tour resources — 360-degree walkthroughs and panoramas available from the site’s page. Explore them through the interactive map.
The preservation paradox
Digital records of heritage are themselves fragile. File formats become obsolete, storage media degrades, and online content disappears: the average lifespan of a web page before it changes or disappears has been measured at months rather than years. The UNESCO Charter on the Preservation of the Digital Heritage identifies “digital obsolescence” as a primary threat and calls on institutions to migrate formats, maintain multiple copies, and document provenance. A 3D scan that exists only in a proprietary format on a single hard drive is not preserved heritage; it is deferred loss.
Frequently Asked Questions
What is digital heritage?
Digital heritage refers to both the digital documentation and preservation of physical cultural heritage (using 3D scanning, photogrammetry, and virtual tours) and the preservation of born-digital cultural artefacts (websites, digital art, social archives). Both are recognised by UNESCO as pressing challenges for cultural memory institutions.
What is photogrammetry and how is it used in heritage?
Photogrammetry is a technique that derives a 3D model from overlapping photographs. In heritage, it is used to record buildings, sculptures, and archaeological sites at a fraction of the cost of laser scanning. The resulting model can be measured, annotated, and archived, providing a baseline record if the physical structure is damaged or destroyed.
Can I visit a digital heritage site if I cannot travel?
Many heritage institutions and platforms provide 360-degree virtual tours, photorealistic 3D models, and video walkthroughs. Europeana aggregates digital content from 3,000 European cultural institutions. CHO links to virtual-tour resources from individual place_cards across more than a thousand sites on its interactive map.
How long does digital heritage documentation last?
Without active maintenance, often not long. File formats become obsolete; storage media deteriorates; websites disappear. Best practice requires regular format migration, multiple off-site copies, and provenance metadata. A 3D model in a current open format, with documented provenance, held by multiple institutions, will outlast one in a proprietary format on a single server.
Sources used in this article
- UNESCO — Charter on the Preservation of the Digital Heritage (2003).
- Europeana — About Europeana (50M+ digital objects from 3,000 institutions).
- ICOMOS — Principles for the Recording of Monuments, Groups of Buildings and Sites.
- CHO magazine — What is cultural heritage?
- CHO — Interactive map with virtual tour links.
