In QGIS 2.0, the old “size scale” field has been replaced by data-defined properties which enable us to control many more properties than jut size and rotation. One of the often requested features – for example – is the possibility for data-defined colors:
Today’s example map visualizes a dataset of known meteorite landings published on http://visualizing.org/datasets/meteorite-landings. I didn’t clean the data, so there is quite a bunch of meteorites at 0/0.
To create the map, I used QGIS 2.0 feature blending mode “multiply” as well as data-defined size based on meteorite mass:
Background oceans and graticule by NaturalEarthData.