Geoportals using geospatial web services have been created for the sharing and analysis of geospatial data. Details of several may be found in my new publication Implementing Geospatial Web Services: A Resource Webliography. Those specifically centered on geoscience or marine and atmospheric sciences may be found in the Geoscience or MASIC (Marine and Atmospheric Sciences Information Center) LibGuides.
Center for International Earth Science Information Network (CEISIN)
FGDC Metadata
GOS (Geospatial One-Stop)
National Biological Information Infrastructure (NBII)
USGS: The National Map Seamless Server
European Commission: INSPIRE Geoportal
IDEC Infraestructura de Dades Espacials de Catalunya
