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document import style variants

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Sarah Hoffmann
2018-12-04 22:22:19 +01:00
parent 31bf7443a6
commit 4c10294a29
1 changed files with 47 additions and 10 deletions
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docs/admin/Import-and-Update.md
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@@ -58,10 +58,56 @@ Nominatim can use postcodes from an external source to improve searches that inv
cd $NOMINATIM_SOURCE_DIR/data
wget https://www.nominatim.org/data/gb_postcode_data.sql.gz
## Choosing the Data to Import
In its default setup, Nominatim is configured to import the full OSM data
set for the entire planet. Such a setup requires a powerful machine with
at least 32GB of RAM and around 800GB of SSD hard disks. Depending on your
use case there are various ways to reduce the amount of data imported. This
section discusses these methods. They can also be combined.
### Using an extract
If you only need geocoding for a smaller region, then precomputed extracts
are a good way to reduce the database size.
[Geofabrik](https://download.geofabrik.de) offers extracts for most countries
and also daily updates which can be used with the update process described
below. There are also
[other providers for extracts](https://wiki.openstreetmap.org/wiki/Planet.osm#Downloading)
Please be aware that some extracts are not exactly cut along the country
boundaries. As a result some parts of the boundary may be missing and
Nominatim cannot compute the areas as a result.
### Reverse-only Imports
If you only want to use the Nominatim database for reverse lookups or
if you plan to use the installation only for exports to a
[photon](http://photon.komoot.de/) database, then you can set up a database
without search indexes. Add `--reverse-only` to your setup command above.
This saves about 5% of disk space.
### Filtering Imported Data
Nominatim normally sets up a full search database containing administrative
boundaries, places, streets, addresses and POI data. There are also other
import styles available which only read selected data:
style Import time DB size after drop
admin 5h 189 GB 20 GB
street
address
full
You can also customize the styles further. For an description of the
style format see [the developement section](../develop/Import.md).
## Initial import of the data
**Important:** first try the import with a small excerpt, for example from
**Important:** first try the import with a small extract, for example from
[Geofabrik](https://download.geofabrik.de).
Download the data to import and load the data with the following command:
@@ -98,15 +144,6 @@ you also need to enable these key phrases like this:
Note that this command downloads the phrases from the wiki link above.
### Reverse-only Imports
If you only want to use the Nominatim database for reverse lookups or
if you plan to use the installation only for exports to a
[photon](http://photon.komoot.de/) database, then you can set up a database
without search indexes. Add `--reverse-only` to your setup command above.
This saves about 5% of disk space.
## Installing Tiger housenumber data for the US