UPDATE: Preview images for legacy Charts, Maps, and Datalenses have been depreciated on our platform. More information can be found here
On a dataset's Primer page and in the Catalog, featured content can be configured to highlight specific assets on a domain. For external resources, preview images can be manually configured for the added content.
However, all Socrata assets will have a standard icon generated from the asset. Any derived view that is a chart, calendar, map, or data lens will generate an icon based on the asset. Any preview images associated with legacy assets will also be replaced with an icon.
For example, if a map, dataset, and datalens are added to featured content on a domain's catalog page, icons that are representative of the selected assets will render as shown in the screenshot below.