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MARVIC Deliverable 2.7 (D2.7) assesses the availability, accessibility, and interoperability of farm-level data across 26 test cases in 12 European countries under the MARVIC project. This task supports the development of harmonized Monitoring, Reporting and Verification (MRV) systems for estimating changes in soil organic carbon (SOC) and greenhouse gas (GHG) emissions. By mapping available farm data sources, identifying data gaps, and reviewing data-sharing platforms, this deliverable evaluates the digitisation and accessibility of farm data for upscaling MRV systems and identifies platforms that could enhance data flows for reducing farmers’ administrative burden.This report is relevant to stakeholders engaged in agricultural data, MRV, and soil carbon monitoring, including EU and national policymakers, researchers, land managers, advisory services, and organizations or private companies operating MRV and compliance systems. The results are particularly important for decision-makers working on climate-smart policies, Carbon Removal and Carbon Farming Certification (CRCF) Regulations, Corporate Sustainability Reporting Directive (CSRD) and the Common Agricultural Policy (CAP).Two main activities underpin this deliverable. First, an overview of common farm data sources was compiled, including the Integrated Administration and Control System (IACS), the transition from Farm Accountancy Data Network (FADN) to Farm Sustainability Data Network (FSDN), Farm Management Information System (FMIS) platforms, national statistics, and initiatives such as the Common European Agricultural Data Space (CEADS). This overview documents both the strengths of these systems and their limitations in data availability, accessibility, and interoperability. Second, a structured survey across the test cases assessed data availability, accessibility and interoperability in six main categories, i.e. farm data, crop data, tillage, water management, soil data, and fertilisers/amendments. Additionally, it also inventoried relevant technology and tools for data sharing and monitoring. The survey was developed through iterative consultation and training was provided to ensure consistency in how it was completed. After completion, the responses underwent an expert review to verify that they accurately reflected regional conditions.Key findings include: IACS remains the cornerstone of EU-wide farm and parcel data, but accessibility and interoperability differ widely between Member States, with most of them providing open access datasets and more than half being interoperable through open Application Programming Interfaces (APIs). Crop type at parcel level are broadly available, but data on management practices (e.g. sowing/harvest dates, tillage, irrigation, fertilisation) are sparse, fragmented, and often only recorded in FMIS or on-farm logs. These are rarely interoperable and frequently restricted by legal or consent-based conditions. Examples of platforms like DjustConnect illustrate how trusted, API-based data exchange can enable secure and farmer-controlled data flows, reduce administrative burden, and improve interoperability. We also identified several opportunities to help address the data gaps: Improving the reuse of IACS datasets: Member States are improving IACS datasets under the High-Value Dataset regulation. From 2025, the Area Monitoring System (AMS), using satellite data and geotagged photos, must be used to enhance monitoring and verification within CAP declarations across all Member States. Together with AMS, the Land Parcel Identification (LPIS) and the Geo-spatial application (GSA) remain core IACS elements, providing essential data on parcel boundaries and crop sequences and supporting automated data entry, the reduce of duplication, and a lower administrative burden for land managers. Making these monitoring and verification data accessible and interoperable for MRV systems, would significantly reduce administrative burden and costs for carbon farming projects. Transition from FADN to FSDN: The shift to FSDN will expand sustainability indicators, including those based on soil and nutrient management. Although it lacks parcel‑level detail as IACS, FSDN will provide national and regional farm‑level averages supporting MRV system implementation. Data collection has begun in 2025 and will be evaluated in 2027. Development of the Common European Agricultural Data Space (CEADS): CEADS aims to enable trusted, EU-wide data sharing by extending the ‘collect once, use many times’ principle to the European level, gradually integrating national and regional nodes (e.g. DjustConnect) under the Data Governance Act and Data Act to support smoother and more reliable MRV data flows. The conclusions of this report underline both opportunities and challenges. While EU-level systems such as IACS and FADN/FSDN provide essential data for MRV purpose, they are not yet sufficient to deliver the level of accuracy, operational management details and interoperability required for automated data entry and large-scale MRV implementation. Stronger EU coordination is required to establish common standards, harmonised definitions, and governance protocols. Complementary data sources, such as FMIS, sensors, and remote sensing, must be better aligned with MRV needs.Looking forward, modular MRV systems tailored to regional contexts, coupled with secure data governance frameworks, will be essential. Building farmer trust through transparent and interoperable solutions can reduce reporting burdens and increase participation. For policymakers, priorities include operationalizing the FSDN, accelerating CEADS development, and enforcing open access to IACS as a high-value dataset. These measures will strengthen EU efforts to monitor soil health targets, support CRCF, and ensure robust CAP performance monitoring.Overall, this report provides a structured overview of European farm data availability, accessibility and interoperability, highlights persistent data gaps, and assesses the feasibility for scaling MRV. It also identifies alternative data sources and outlines practical pathways for robust MRV systems through improved interoperability, advanced monitoring technology and tools, and trusted data sharing infrastructures.