Data sources
City API combines many public and commercial sources into one dataset. Onde merges the most reliable facts, fills the gaps, and checks each release.
No single source has correct cities, names, and borders for all countries.
How Onde builds the dataset
- For each place, the build takes the most reliable facts from the sources.
- Onde adds what the sources do not have, such as common names, local names, and districts.
- Onde corrects errors by hand. Each correction that changes a fact cites its source.
- Each release must pass quality gates before it goes live. The gates check search, autocomplete, reverse lookup, a list of named cases, and the response time.
- A release keeps the ID of each city from the previous release.
Open data
Some of the sources are open data. Onde changes and extends the data of these sources:
- GeoNames, under CC BY 4.0.
- Wikidata, under CC0 1.0.
- Natural Earth, in the public domain.