How can I get all roads/ways from an osm2pgsql shema? - postgresql

Question

I'm trying to create a list of every road in Germany (With latitude,longitude and Streetname).
So far I have imported the german osm file with the help of osm2pgsql into a postgres Database.
So what I am looking for is a query that allows me to query every road.

Answer 1

First of all I would suggest using the psql tool. So assuming your database is called gis enter the following command at the terminal:
psql gis
from within the psql tool you can query the database but first it is a g0od idea to get an idea of which tables were created by osm2psql, do this be entering:
\d
this should give you output like this:
List of relations
Schema | Name | Type | Owner
--------+--------------------+-------+----------
public | geography_columns | view | postgres
public | geometry_columns | table | gis
public | planet_osm_line | table | user
public | planet_osm_nodes | table | user
public | planet_osm_point | table | user
public | planet_osm_polygon | table | user
public | planet_osm_rels | table | user
public | planet_osm_roads | table | user
public | planet_osm_ways | table | user
public | spatial_ref_sys | table | gis
(10 rows)
There we can see a likely looking candidate in planet_osm_roads, enter:
\d planet_osm_roads
this will show you the structure of the roads table, which will look something like this:
Table "public.planet_osm_roads"
Column | Type | Modifiers
--------------------+----------+-----------
osm_id | bigint |
access | text |
addr:housename | text |
addr:housenumber | text |
addr:interpolation | text |
admin_level | text |
aerialway | text |
aeroway | text |
amenity | text |
....
waterway | text |
wetland | text |
width | text |
wood | text |
z_order | integer |
way_area | real |
way | geometry |
From there we can formulate our query. Something like:
SELECT osm_id,name,way FROM planet_osm_roads LIMIT 1;
will get you the first road in the list. The documentation at http://www.postgresql.org/docs/ will help you with decoding the way geometry string.