Open civic data
Public-sector datasets, including many cities' public art registries, published for anyone to use, build on, and redistribute.
Public art inventories are among the most re-used cultural datasets cities publish: they feed maps, apps, research, and tourism products the city could never have built or budgeted itself. Publishing the registry turns a spreadsheet into infrastructure. It runs the other way too: a public guide that reads the city's open data keeps its civic geography current without a second data-entry job.
Quality beats format. The datasets that actually get built on have coordinates that land on the artwork rather than the parking lot, photos with rights cleared for reuse, artist names spelled the way artists spell them, and, rarest of all, records that say when a work was removed. An open dataset nobody trusts is just an open liability.