Description 4DHydro is a project funded by ESA which aims to provide a study of selected geospatial and climate data to improve the understanding, observation and monitoring of the availability of water resources planet earth. This GitHub project has been created to collect the metadata of the EO, LSM or Insitu data involved in this study, Features Centralizing the collection of metadata from all consortium partners Possibly open up the metadata contribution to other contributors at the end of the project. Verify the validity and consistency of metadata according to project specifications. Create a STAC catalog from this metadata, which will be automatically updated when new metadata is added. You can find the full tutorial on the following links https://github.com/4dhydro/4dhydro-open-science-catalog-metadata