Looks like a heatmap, and most likely generated by R, a powerful free statistical software.

1. Here is a link to show 1)what is a heatmap and 2) step by step how to generate a heatmap in R:

http://flowingdata.com/2010/01/21/how-to-make-a-heatmap-a-quick-and-easy-solution/

2. In Stata, it's pretty easy to create a heatmap, see the following example:
use http://www.stata-press.com/data/r13/sandstone.dta, clear
twoway contour depth northing easting, heatmap           //you have to use Stata 13 to use the option "heatmap"


Good luck

Thanks a lot！