Topic pages are used to organize communities and shared resources around specific topics, such as those listed on the Topics index, at https://publiclab.org/tags.
Card text and image
On the top of topic pages, a card is shown with the topic name, and a short text (as in the above screenshot), and a background image may be shown. This is drawn from the very first paragraph of the wiki page bearing the same name; so for the topic
balloon-mapping, the text is drawn from https://publiclab.org/wiki/balloon-mapping. The image is also taken from the lead image of the wiki page of that name.
If no matching wiki page exists, you'll see a prompt to create one.
Aliases and redirects
If you want the lead text and image to be drawn from a different wiki page, you can make the matching wiki page a "redirect page" by adding the tag
______ is replaced with the text from the URL of the page you really want.
For example, if you're on the topic page for
algal-blooms but want the text and image to be drawn from
algae, you can make a page at
https://publiclab.org/wiki/algal-blooms, but then add the tag
redirect:algae to that page. Then, anyone visiting
https://publiclab.org/wiki/algal-blooms will be redirected to
https://publiclab.org/wiki/algae, and the text and lead image of
/algae will be used on the card for the topic
algal-blooms. That is, the topic page can follow redirects to find the text and lead image to display.