move zoom_to_rank computation to extra file

[nominatim.git] / docs / develop / Database-Layout.md

diff --git a/docs/develop/Database-Layout.md b/docs/develop/Database-Layout.md
index c2d4d4654a0569ea2667396c6aa6eb41a19b9259..98413a0bfa9864dbc5e83673841f68ff31db8df9 100644 (file)
--- a/docs/develop/Database-Layout.md
+++ b/docs/develop/Database-Layout.md
@@ -119,19 +119,19 @@ to compute the address relations between places. These tables are partitioned.
 Each country is assigned a partition number in the country_name table (see
 below) and the data is then split between a set of tables, one for each
 partition. Note that Nominatim still manually manages partitioned tables.
 Each country is assigned a partition number in the country_name table (see
 below) and the data is then split between a set of tables, one for each
 partition. Note that Nominatim still manually manages partitioned tables.

-Native support for partitions in PostgreSQL only became useable with version 13.
+Native support for partitions in PostgreSQL only became usable with version 13.

 It will be a little while before Nominatim drops support for older versions.
 
 ![address tables](address-tables.svg)
 
 It will be a little while before Nominatim drops support for older versions.
 
 ![address tables](address-tables.svg)
 

-The **search_name_X** table is used to look up streets that appear in the
+The **search_name_X** tables are used to look up streets that appear in the

 `addr:street` tag.
 
 The **location_area_large_X** tables are used to look up larger areas
 (administrative boundaries and place nodes) either through their geographic
 closeness or through `addr:*` entries.
 
 `addr:street` tag.
 
 The **location_area_large_X** tables are used to look up larger areas
 (administrative boundaries and place nodes) either through their geographic
 closeness or through `addr:*` entries.
 

-The **location_road** table is used to find the closest street for a
+The **location_road_X** tables are used to find the closest street for a

 dependent place.
 
 All three table cache specific information from the placex table for their
 dependent place.
 
 All three table cache specific information from the placex table for their


@@ -155,9 +155,9 @@ Nominatim also creates a number of static tables at import:
    default languages and saves the assignment of countries to partitions.
  * `country_osm_grid` provides a fallback for country geometries
 
    default languages and saves the assignment of countries to partitions.
  * `country_osm_grid` provides a fallback for country geometries
 

-## Auxilary data tables
+## Auxiliary data tables

 
 

-Finally there are some table for auxillary data:
+Finally there are some table for auxiliary data:

 
  * `location_property_tiger` - saves housenumber from the Tiger import. Its
    layout is similar to that of `location_propoerty_osmline`.
 
  * `location_property_tiger` - saves housenumber from the Tiger import. Its
    layout is similar to that of `location_propoerty_osmline`.