2018-09-28 21:17:02 +03:00
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# Additional Data Sources
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This guide explains how data sources other than OpenStreetMap mentioned in
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the install instructions got obtained and converted.
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2020-07-01 18:38:44 +03:00
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## Country grid
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Nominatim uses pre-generated country borders data. In case one imports only
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a subset of a country. And to assign each place a partition. Nominatim
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database tables are split into partitions for performance.
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More details in [osm-search/country-grid-data](https://github.com/osm-search/country-grid-data).
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## US Census TIGER
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For the United States you can choose to import additonal street-level data.
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The data isn't mixed into OSM data but queried as fallback when no OSM
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result can be found.
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More details in [osm-search/TIGER-data](https://github.com/osm-search/TIGER-data).
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## GB postcodes
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For Great Britain you can choose to import Royalmail postcode centroids.
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More details in [osm-search/gb-postcode-data](https://github.com/osm-search/gb-postcode-data).
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## Wikipedia & Wikidata rankings
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Nominatim can import "importance" data of place names. This greatly
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improves ranking of results.
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More details in [osm-search/wikipedia-wikidata](https://github.com/osm-search/wikipedia-wikidata).
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