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It would be nice to have the preview image be able to display the space's logo-image, especially as there are not files to preview, &that is what our users have come to expect.
We can presently search by any combination of repositories, via checkbox, which might be possible, but I'm not sure how it is done offhand.
I really like the metadata-search page, but 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.
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