TWIAV

A web application based on Leaflet showing Dutch public data from PDOK.

• TMS Backgound map: BRT achtergrondkaart
• TMS Aerial photo - please note this aerial photo can be used for non-commercial uses only (CC-BY-NC)
• WFS National Parks

This example relies heavily on a gist published by Edward Mac Gillavry (Webmapper): Leaflet.js showing TMS in RD and WFS in WGS-84 - gist and block.

This example has been extended a little bit with a layer control and tooltips showing attribute information on the WFS layer.

TWIAV

An example using topojson.mesh() to distinguish between municipal (white) and provincial (black) boundaries.

An arc is stroked as a provincial boundary (black) if

1. the arc is shared by two geometry objects (i.e. a !== b) AND they do not have the same province name (i.e. a.properties.provincie !== b.properties.provincie)
2. the arc is only used by a single geometry (i.e. a === b). This is the case for all external, national boundaries.

TWIAV

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 \