Since 1991, the C-band scatterometers onboard the two European Remote Sensing satellites, ERS-1 and ERS-2 (ESCAT), and three Metop satellites (ASCAT), have provided an unparalleled long-term source of backscatter data with consistent frequency, viewing geometry and orbit characteristics. The upcoming Metop Second Generation satellites, carrying the SCA scatterometers, will extend this data collection into the 2040s, resulting in a 40-year continuous record from inter-calibrated sensors. This extensive dataset holds profound value for monitoring land surface dynamics and supporting climate applications. However, currently, there are no long-term products from combined ERS and Metop scatterometer observations available to exploit the valuable information in backscatter observables: backscatter, slope and curvature. Thus, the primary objective of the FDR4LDYN project is to design and develop a long-term fiducial data record from ESCAT data that is interoperable with ASCAT and SCA. A critical aspect of this is testing the robustness of backscatter observables from the ESCAT sensors, which have a lower observation density than the ASCAT sensors. This involves analyzing undersampled ASCAT backscatter triplets to mimic the temporal resolution of ESCAT and comparing them with original ASCAT data to assess the impact of measurement density on slope and curvature retrievals. Additionally, the interoperability of ESCAT and ASCAT data requires thorough analysis and careful tuning of existing inter-calibration methods. This project will also demonstrate the scientific potential of this data record for monitoring land surface dynamics through three use cases: soil moisture, vegetation monitoring, and the detection of surface water and flood dynamics. To ensure the sustainability and uptake of the FDR4LDYN product, we will also focus on user engagement and feedback through several key initiatives. These include visualizing results on a dedicated project website, providing Jupyter Notebooks with code examples, and ensuring the continuous operation and evolution of the product, which will be disseminated via the online data repository of TU Wien.