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fixup typos and linking of data-source docs

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Can't create symbolic links to a directory and then
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Sarah Hoffmann
2018-12-01 22:40:37 +01:00
parent c68833cd7f
commit 9a13086122
2 changed files with 6 additions and 5 deletions
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data-sources/country-grid/README.md
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@@ -31,7 +31,7 @@ Each place is assigned partition, which is a number 0..250. 0 is fallback/other.
During place indexing (`sql/functions.sql: placex_insert()`) a place is assigned the partition based on its country code (`sql/functions.sql: get_partition(country_code)`). It checks in the `country_name` table.
Most countries have their own parition, some share a partition. Thus partition counts vary greatly.
Most countries have their own partition, some share a partition. Thus partition counts vary greatly.
Several database tables are split by partition to allow queries to run against less indices and improve caching.
@@ -45,13 +45,13 @@ Several database tables are split by partition to allow queries to run against l
## Data files
### `data/country_name.sql`
### data/country_name.sql
Export from existing database table plus manual changes. `country_default_language_code` most taken from [https://wiki.openstreetmap.org/wiki/Nominatim/Country_Codes](), see `utils/country_languages.php`.
### `data/country_osm_grid.sql`
### data/country_osm_grid.sql
`country_grid.sql` merges territories by country. Then uses `function.sql: quad_split_geometry` to split each country into multiple [Quadtree](https://en.wikipedia.org/wiki/Quadtree) polygons for faster point-in-polygon lookups.