A land use map is a map that shows human utilization to which land is put at a given duration. There are a couple of applications for such maps including the zoning map and maps that show utilization. A zoning map is used to mark out areas that are designated for particular types of land use. Read more on http://www.wisegeek.com/what-are-land-use-maps.htm.
The maps are really handy when trying to rezone areas in a region, it shows which have been utilized for particular purpose like farming, industries, housing, air strips, harbors etc. Right now you see them all around where I live as more & more farm land disapears. God knows we need more malls & less farms