TopoJSON Part One
  Duration: 16:48
This Lesson is for subscribers

Topojson_part_one_280x158
Unlock this lesson NOW!
  • Get expert advice on TopoJSON Part One
  • Enjoy access to the complete DashingD3js catalog
  • Start mastering D3.js right now!

Takeaways:

  • Geospatial Topology is the study of rules concerning relationships between points, lines and polygons that represent the features of a geographic region
  • TopoJSON extends GeoJSON by encoding the topology of the geometric objects in GeoJSON
  • The TopoJSON format represents geometries as line segments which are called "arcs"
  • If two Geospatial regions that neighbor each other have 1 border, in GeoJSON this border would be defined in the polygon definitions twice, whereas in TopoJSON this border would be defined in "arcs" only once
  • TopoJSON has four different key value pairs: "type", "transform", "objects", and "arcs"
  • TopoJSON builds line segments made out of the initial coordinates, plus the subsequent deltas as defined in the "arcs" arrays

This Transcript is for subscribers.

Topojson_part_one_280x158
Unlock this D3 Tutorial NOW!
  • Get expert advice on TopoJSON Part One
  • Enjoy access to the complete DashingD3js catalog
  • Start mastering D3.js right now!
<< Back To D3 Screencast and Written Tutorials Index