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add links to official secondary importance file

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This commit is contained in:
Sarah Hoffmann
2024-05-04 13:13:00 +02:00
parent 332de72045
commit bc84db6460
2 changed files with 16 additions and 7 deletions
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9
docs/admin/Import.md
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@@ -75,14 +75,17 @@ This data is available as a binary download. Put it into your project directory:
cd $PROJECT_DIR
wget https://nominatim.org/data/wikimedia-importance.sql.gz
wget -O secondary_importance.sql.gz https://nominatim.org/data/wikimedia-secondary-importance.sql.gz
The file is about 400MB and adds around 4GB to the Nominatim database.
The files are about 400MB and add around 4GB to the Nominatim database. For
more information about importance,
see [Importance Customization](../customize/Importance.md).
!!! tip
If you forgot to download the wikipedia rankings, then you can
also add importances after the import. Download the SQL files, then
run `nominatim refresh --wiki-data --importance`. Updating
importances for a planet will take a couple of hours.
run `nominatim refresh --wiki-data --secondary-importance --importance`.
Updating importances for a planet will take a couple of hours.
### External postcodes

14
docs/customize/Importance.md
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@@ -12,7 +12,7 @@ customize them.
The main value for importance is derived from page ranking values for Wikipedia
pages for a place. For places that do not have their own
Wikipedia page, a formula is used that derives a static importance from the
places [search rank](../customize/Ranking.md#search-rank).
place's [search rank](../customize/Ranking.md#search-rank).
In a second step, a secondary importance value is added which is meant to
represent how well-known the general area is where the place is located. It
@@ -21,7 +21,13 @@ importance values.
nominatim.org has preprocessed importance tables for the
[primary Wikipedia rankings](https://nominatim.org/data/wikimedia-importance.sql.gz)
and for a secondary importance based on the number of tile views on openstreetmap.org.
and for [secondary importance](https://nominatim.org/data/wikimedia-secondary-importance.sql.gz)
based on Wikipedia importance of the administrative areas.
The source code for creating these files is avaible in the Github projects
[osm-search/wikipedia-wikidata](https://github.com/osm-search/wikipedia-wikidata)
and
[osm-search/secondary-importance](https://github.com/osm-search/secondary-importance).
### Customizing secondary importance
@@ -41,8 +47,8 @@ table will be ignored. You must furthermore create an index as follows:
CREATE INDEX ON secondary_importance USING gist(ST_ConvexHull(gist))
```
The following raster2pgsql command will create a table that conforms to
the requirements:
The following raster2pgsql command will create a table from a tiff file
that conforms to the requirements:
```
raster2pgsql -I -C -Y -d -t 128x128 input.tiff public.secondary_importance