Life cycle of 3d data for cultural heritage: Identify how and when 3D data is produced. Choose 3D file formats for archiving. Define a robust process for producing 3D data and preserving it

International audience; 3D is now commonly used for Cultural Heritage study, valorization and preservation. The gathered experiences make possible to define standard processes and practices to ensure data quality and their preservation. Under the supervision of the French national infrastructure for digital humanities (Huma-Num), the 3D Consortium has thus defined a life cycle of such data from creation up to archiving. It was part of its missions that are: bring together groups working in the field of archaeology and cultural heritage and with experience of using 3D technologies and producing 3D models; define the vocabulary associated with 3D technologies for HSS; develop specific open-source 3D tools; disseminate good practices and commissioning a conservatory dedicated to 3D data. We have formalized the different steps of data life Cycle. The first step consists in collecting data production from capture device (laser scanner, digital camera…). Such data which are denominated A0. The second step consists in processing the data (cleaning, meshing,…) to create the initial models V0. Finally, new modeling may be added to add new hypotheses for the restitution. This step may be iterated creating V1n versions up to the V2 that is the final version. A supplementary step may be added when valorization is considered. All versions from A0, V0 up to V2 are candidates for archiving. We have formalized this process with a sequential graph that introduces a metadata new schema dedicated to the long-term archiving of 3D models for HSS. We have also created a software aLTAG 3D, that leverage the usual complexity of documentation to create metadata and of checking that the 3D files are suitable for archiving. It creates an archive that can be pushed to the CINES – the French national infrastructure for high-performance computer, and for long-term digital preservation.