On: Mapping with D3

[mbostock]

As mentioned in the post, take a look at TopoJSON's topology-preserving simplification:

https://github.com/mbostock/topojson/wiki

TopoJSON's --simplify flag uses Visvalingam's algorithm. And, since it's the mesh that is simplified rather than independent features, shared borders between features will be preserved. Without this feature, you end up with something that resembles shattered glass:

http://twitter.yfrog.com/z/mn13gp