The WorldSoils activity aims at developing a global Earth Observation-Soil Monitoring System (EO-SMS) on a suitable cloud environment utilizing open source and information available from operational services (e.g. information layers from the Copernicus Land Monitoring Service (CLMS) such as impervious layers e.g. soil sealing, land cover and change, soil moisture, etc…), user exchangeable soil reference data (e.g. LUCAS Topsoil, local or regional reference data (e.g. Soil Spectral Libraries (SSLs)) and additional variables and/or indices derived from EO data together with blending and modelling techniques. The development of the EO-SMS shall be done in close cooperation with authoritative end users with a mandate on reporting on soils, the proximal soil mapping community, and EO experts. EO-SMS shall allow to monitor soil indices relevant for monitoring the global top soils as baseline information for downstream research, institutional and commercial applications and services (e.g. reporting, soil management systems, agricultural applications, …). This project is focused on topsoil organic carbon content.