I've read all the posts and docs about the heatmap plugin but can't seem to get it to work.
The map is the size of the United States and has a little over 2000 points. I've tried small radi (1 meter) and large radi (5 million meters), but still get a red hot map.
I'm using QGIS 1.8 and WGS84. The data was initially in a spreadsheet, but I saved it as a .shp vector layer and deleted the old csv layer.
The goal is to convert that to contour lines to map density of these points like in this Mapbox blog post.