As in, all the places with a karst topography in one color, all the places with a population density of more than 1000/sq km another color, and those places wit

As in, all the places with a karst topography in one color, all the places with a population density of more than 1000/sq km another color, and those places with wild rabbit populations a third? In other words, what does "similar" mean, how many people would agree with your definition, and why should Google do this?