File:OSM cross kitchen.jpg

Image combined from a georeferenced basemap of Helsinki in ECW format and in UTM N35 projection and a vector layer from OGC Web Feature Service serving the same data. Data was imported first into PostGIS database with osm2pgsql utility. Basemap was rendered with Mapnik and nik2img.py utility into one georeferenced 10000 by 10000 pixel sized image covering most of Helsinki with 2.5 meter pixel size. File size after conversion to ECW format with gdal_translate program is roughly 25 megabytes. Vector overlay comes from GeoServer WFS service. All lines with some highway tag, except highway=cycleway and highway=footway have been fetched from the service. Image and vectors have been combined with OpenJUMP GIS program and highways have been classified by their maxspeed tags. Resulting map visualises the maxspeed values, but it works also as a quality control tool by showing the ways which don't have any maxspeed tag yet with dashed red line.