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I really like the metadata-search page, but most of most our repos (&other aggregators) also allow for selecting a geo-bounded box from a map. As almost all our datasets have lat/lon coordinates in their jsonLD metadata. It will be a feature this geoscience based search will need.
We continue to make use of science-on-schema.org & DCAT2 which has a schema.org mapping. This along w/CSVW also makes the data discoverable via google dataset search. Though our more focused faceted search should be of even more use to the EarthCube search users.