The service is defined to satisfy two IERs, which were derived from the Deliverables D5 (Report on User Requirements) from EUNADICS-AV H2020 project (see www.eunadics.eu; https://archief06.archiefweb.eu/archives/archiefweb/20201119112158/http…). IER: 1 To send an email notification to inform about the availability of SO2LH datasets (Situation Awareness). IER 2: To provide SO2LH datasets for Data Integration. The OPAS datasets are provided in NetCDF format.