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Getting ready

You should import the shapefile representing the cities from the USA that we generated in a previous recipe (the PostGIS table named chp03.cities). In case you haven't done so, download that shapefile from the https://nationalmap.gov/ website at http://dds.cr.usgs.gov/pub/data/nationalatlas/citiesx020_nt00007.tar.gz (this archive is also included in the code bundle available with this book) and import it to PostGIS:

$ ogr2ogr -f PostgreSQL -s_srs EPSG:4269 -t_srs EPSG:4326 -lco GEOMETRY_NAME=the_geom -nln chp03.cities PG:"dbname='postgis_cookbook' user='me' password='mypassword'" citiesx020.shp

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