This report addresses deliverable D1.4 of the DigiMon project, which covers the preprocessing workflow for datasets acquired by Distributed Acoustic Systems (DAS). The workflow seeks to capture the key stages required to prepare the raw seismic data for the main processing stages and demonstrates their application using both synthetic and real-world data. A description of the synthetic datasets can be found in DigiMon deliverable D1.3 report, while details of the real-world datasets are included in DigiMon reports D1.1 and D1.2
