I've been playing with Mapbox's blog post about converting heat maps to contour lines, and I'm stuck at the extraction part of this process.
I used the CSV plugin to create a vector layer of points, then a heat map raster layer based on that, but I can't seem to be able to see the contour lines based on that raster layer after that. When I looked at the properties and selected categorized, it didn't seem to have any symbols listed.
I'm guessing this is probably some kind of type error since I had to create the raster layer based off of map units and not meters, but I don't know how to correct it. What am I missing?
Here's a screenshot. It's a map of racially charged geographic locations based on their name. The main difference being that I've stripped any instances of Arroyo Negro, but left in more explicit cases.