Ethics and land use...who gets what?

I have taken an early start on developing some ideas for my thesis. I have lots of time to develop ideas and change directions. At this point, though, I have begun looking at 'land use' and 'ethics'. I am interested in how governments aquire public/private land for public/economic use. Some examples of this are The Great Smoky Mountain National Park, Yosemite Valley, Lafayette Park, and many others.

An article that came out in the past few years shows a different way of approaching the transitioning of slums into housing for the use of economic development. You can find it here.