My very first exercise with TopoJSON and D3 - just a municipal map showing some basic information when you hover over the individual municipalities. Nothing really fancy, but, hey, you have got to start somewhere...
###Steps followed to create the file nlgemeenten2009.json:
Step 1. download input file gem_2009_gn3.shp from the Dutch Statistical Office: Wijk- en Buurtkaart 2009
Step 2. convert shapefile to GeoJSON with ogr2ogr:
ogr2ogr \
-f GeoJSON \