Tags/additions are based on BOM radar information pages _and_ WMO weather radar database data for approximate location, and traced satellite imagery for accurate location.

A small number of other fields (such as frequency and antenna configuration) are solely from the WMO weather radar database which is where BOM publish such data to, and seemingly not available anywhere else. This is factual data (essentially from a single primary source who could supply such data). Factual data cannot be copyrighted in Australia, and LWG have also generally decided in https://osmfoundation.org/wiki/Licensing_Working_Group/Minutes/2023-08-14#Ticket#2023081110000064_%E2%80%94_First_party_websites_as_sources that it is fine to import factual data such as opening hours into OSM due to its factual basis and inability to be copyrighted.