No, that's Third Ward and then South Park. Pearland is south of the Beltway (you can kind of see the freeway lines). These are from 2000, too, so the new ones should be interesting. Aside from a few areas, Houston is just a swirl of colors.
Wouldn't it be nice if the whole image was just a blur of all the different colors? Why do people of the same color choose the same patch of land to live on?
For the most part, that's what Houston is (just a blur of colors). As far as the patches go, that's just for historical reasons. **** happens. Houston is hardly the only city with this though, and is actually one of the least segregated cities that the guy mapped out (he has a bunch of other cities he did, too).
Houston may be the least segregated but is still segregated. I could spot 3rd and 5th ward a mile away.
Some of it is definitely economic. It's easier for some folks to live in different parts of Houston than it is for them to live in Manhatten. That said, if you overlaid economic data with these dots, you'd certainly see some correlations.