StratiGraph D4.2 – Report on Local Network Services and Micro Servers

This deliverable documents Task 4.2 of Work Package 4: the local network services and micro servers that bring the StratiGraph environment to the excavation. Much stratigraphic evidence is produced on sites where connectivity is weak or absent and where documentation cannot be postponed, so the integrity of the chain from the first record in the trench to the published knowledge graph depends on what can be done on site, before any connection to the cloud is available. The report defines the Field Computing Node (FCN) and holds that it is not a separate field system: it is the same software ecosystem as the Institutional StratiGraph Node, deployed under different conditions, so that field work and institutional work become two situations of one continuum. It derives requirements from the case studies and from the volumes of data actually measured in the field; defines three reference hardware classes whose capacity depends mainly on how much artificial intelligence is needed on site, with their network, power and logistics; describes the services through which a team records, shares, aggregates, validates and protects its work on a local network; and sets out how that work reaches the Institutional Node through synchronisation and, through an explicit act of publication, the European Collaborative Cloud for Cultural Heritage (ECCCH). Three commitments run through it: continuity of field recording during connection interruptions or node failures, no silent dependence on external services, and no entry of automatically generated content without the acceptance of a responsible person. Open points, such as offline identity and the details of synchronisation, are stated as such and referred to the WP4 deliverables D4.1 and D4.3. Deliverable D4.2 of the Horizon Europe project StratiGraph – Knowledge Graphs for Stratigraphy (Grant Agreement No. 101232855, HORIZON-CL2-2024-HERITAGE-ECCCH-01-02), Work Package 4 (Abstraction Layer and Infrastructure). Lead beneficiary: CY Cergy Paris Université. Contractual due date: Month 13 (rescheduled). Dissemination level: PU – Public. This record holds the version of the deliverable as submitted to the European Research Executive Agency (REA) on 31 October 2026. It has not yet been through the granting authority's review; any revised version will be added to this record as a new version. Project website: https://stratigraph-eccch.eu/