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docs/data-sources/overview.md
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This guide explains how data sources other than OpenStreetMap mentioned in
the install instructions got obtained and converted.
## Country grid
Nominatim uses pre-generated country borders data. In case one imports only
a subset of a country. And to assign each place a partition. Nominatim
database tables are split into partitions for performance.
More details in [osm-search/country-grid-data](https://github.com/osm-search/country-grid-data).
## US Census TIGER
For the United States you can choose to import additonal street-level data.
The data isn't mixed into OSM data but queried as fallback when no OSM
result can be found.
More details in [osm-search/TIGER-data](https://github.com/osm-search/TIGER-data).
## GB postcodes
For Great Britain you can choose to import Royalmail postcode centroids.
More details in [osm-search/gb-postcode-data](https://github.com/osm-search/gb-postcode-data).
## Wikipedia & Wikidata rankings
Nominatim can import "importance" data of place names. This greatly
improves ranking of results.
More details in [osm-search/wikipedia-wikidata](https://github.com/osm-search/wikipedia-wikidata).