https://developers.google.com/search/docs/appearance/structured-data/image-license-metadata?authuser=1
Google Images SEO: Image Metadata | Google Search Central | Documentation | Google for Developers
When you specify image metadata, Google Images can show more details about the image, such as who the creator is, how people can use an image, and credit...
google imagesmetadata searchdocumentation forseocentral
https://geodati.gov.it/geoportale/eng/metadata-search-results?keyword=INSPIRETheme_s:(%22Risorse%20minerarie%22%20OR%20%22Mineral%20resources%22)&paged=2
RNDT - Metadata search results
metadata searchresults
https://geodati.gov.it/geoportale/eng/metadata-search-results?keyword=INSPIRETheme_s:(%22Regioni%20biogeografiche%22%20OR%20%22Bio-geographical%20regions%22)&paged=1
RNDT - Metadata search results
metadata searchresults
https://geodati.gov.it/geoportale/eng/metadata-search-results?keyword=INSPIRETheme_s:(%22Geologia%22%20OR%20%22Geology%22)
RNDT - Metadata search results
metadata searchresults
https://search.crossref.org/
Crossref Metadata Search
crossrefmetadatasearch