Purpose

Josm currently lacks an easy way to import features from an Standard WFS based service. So importing/updating for example buildings which are available in a lot of regions in the world is basically impossible on a large scale.

For Northrhine-Westfalia there was a solution with the "importer2" plugin and a C# based companion tool which downloads WMS image tiles, converts them back to vectors with the help of OpenVision and then passes it to josm. This solution seems to be basically unmaintained and does not work very well.

So the idea is to use a different plugin which is capable of importing vectors by point and click and simply rewrite the server component.

The plugin which works is plbuildings used for Building Import in Poland. By simply changing the URL one can use it for other regions, as long as the server returns expected output.

Installation

Webserver installation:

cd /var/www/
git clone https://github.com/flohoff/plbuildingsnrw/
cd plbuildingsnrw

Create config containing the database informations:

cp dot-config.plbuildingsnrw.json .config.plbuildingsnrw.json
vi .config.plbuildingsnrw.json

Configure apache2:

ScriptAlias /plbuildingsnrw /var/www/plbuildingsnrw/plbuildingsapi
<Location /plbuildingsnrw/>
	Options ExecCGI
	SetHandler fcgid-script
</Location>

Install postgres and create database:

su - postgres -c "createuser dbuser"
su - postgres -c "createdb hu_nrw -O dbuser"
su - postgres -c "psql hu_nrw -c 'create extension postgis'

Then download the Hausumringe NRW Shape:

https://www.opengeodata.nrw.de/produkte/geobasis/lk/akt/hu_shp/

Unzip it and load it into your new database with ogr2ogr

ogr2ogr -f "PostgreSQL" \
	-nlt MULTIPOLYGON \
	-a_srs "EPSG:25832" \
	-nln "hu_nrw" \
	PG:"dbname=hu_nrw" \
	hu_shp.shp

Now you should be ready and this command should return an osmxml file:

curl "https://localhost/plbuildingsnrw/v1?lat=51.904858&lon=8.3486155&daDta_source=bdot&search_distance=3.0"

Kataster Kreis Gütersloh

Download

https://geoportal.kreis-guetersloh.de/opendata/planen_bauen_kataster/ALKIS_Guetersloh_EPSG25832_SHAPE.zip

Extract

ogr2ogr -f "PostgreSQL" \
	-nlt MULTIPOLYGON \
	-a_srs "EPSG:25832" \
	-nln "hu_kreisgt_new" \
	PG:"dbname=plbuildings" \
	gebaeudeBauwerk.shp

Configuring JOSM

Install the plbuildings plugin from the JOSM plugins repository. Then go to Edit -> Preferences -> Advanced Preferences and search for plbuildings.server_url and replace it with

https://osm.zz.de/zzbuildings/v3/all/

when using Germany Northrhine-Westfalia, Kreis Gütersloh etc.

Alternatively you can use the "zzbuilding" plugin which is basically plbuildings renamed and checking of additional attributes removed and a changed default URI.

See

https://github.com/flohoff/josm-zzbuildings-plugin