TopoJSON

An extension of GeoJSON that encodes topology. It is more compact than GeoJSON and it is used by data journalists and tools like forio D3.js, PowerBI or Looker, etc..

• Specification and Javascript tools: https://github.com/topojson/topojson
• Free online web tool to display, simplify and convert TopoJSON: https://mapshaper.org/
• Tools and demos by Mike Bostock (Javascript):
  • topojson cli tool to create TopoJSON: https://github.com/mbostock/topojson
  • About topojson tool (Javascript) "How To Infer Topology": https://bost.ocks.org/mike/topology/
  • About topojson tool ff.: Converting Sapefiles to TopoJSON
• Programming with GeoJSON and TopoJSON (PDF, deutsch):

https://www.digitale-nachhaltigkeit.unibe.ch/e90958/e490158/e490446/e490536/rightcol490545/OpenData2015_Termin09_Uebung_GastvortragLukasVonlanthen__ger.pdf

Data in TopoJSON format

• Swiss admin. boundaries, lakes and zip code (PLZ) geodata in TopoJSON format:

https://github.com/interactivethings/swiss-maps

• "Choropleth with wealth distribution of Switzerland" by huembelin’s Block: https://bl.ocks.org/huembelin/5452de6dff30c70d642439a7746ec418