The common European Green Deal data space will interconnect currently fragmented and dispersed data from various sources (including in-situ, statistical, cartographical and remote sensing), both for/from the private and public sectors, to support the objectives of the European Green Deal. It will offer an interoperable, trusted IT environment for data processing, and a set of rules of legislative, administrative and contractual nature that determine the rights of access to and use of the data.
This document is the Deliverable 2.1 for the AD4GD project. It presents the initial results achieved in the context of Task 2.1 “Identification of the in-situ networks contributing to the Green Deal data” as part of Work Package 2 “In-situ networks, CitSci and Socioeconomic Data”. The reader should consider that a more elaborated version of this document will be released on month 20 the project as Deliverable 2.2.

The document provides an overview of the identified in-situ data sources and their relations with the Essential Variables (EVs) as a basis for a common semantic framework to better integrate heterogeneous in-situ data sources into the Green Deal Data Space (GDDS) following the FAIR principles. The implementation of FAIR can be completed by one or more nodes that will be dedicated devoted to data discovery and finding information: nodes of the OGC Web Coverage Service (and the OGC API Coverages) for data access of a subset of the coverage data; nodes implementing the OGC Web Feature Service (and the OGC API Features) for data access of a subset of the feature data collections; nodes implementing OGC Sensor Observation Service (or the OGC Sensor Things API) for data access of a subset of the observations and measurements; and a 
OGC definition service with a vocabulary of observedProperties. Another important component of interoperability and trust is the need for providing the data provenance and the data quality information. Another aspect of trust is to provide authentication and authorization with OpenID Connect, certificates and HTTPS can be used to ensure that services are genuine and have not been tampered with. For this, we should adopt solutions coming from the IT mainstream.