一片空地 and 一片草原 - what's the difference/relation Can anyone explain what the difference or relation between 一片空地 and 一片草原 might be?

Are these two expressions the same?
“一片草原” - obviously there must be grass growing there; 



“一片空地” - just open space/ground without any building or trees, so you can put something there or build something there, or even play baseball there.