New to mapping.
Trying to create a heat map with data that updates every hour for US Counties with leaflet.js similar to http://leaflet.cloudmade.com/examples/choropleth-example.html. But, adding all the US Counties in 1 shot makes map jerky in IE.
So found this example of using GeoJSON tiles with leaflet.js, http://bl.ocks.org/3725681
Only problem is that many tiles are not rendered completely. I think some of the z/x/y.json files are missing coordinates, but not sure. Can someone point me to the right direction of the problem here.