The base of the land value tax is the value of the land though. If the land is in the middle of a high population density area then the land is worth more and it generates more tax revenue.
The difference between this and property tax is that if you have a 12 story building on one piece of land and a 2 story building on the adjacent one, otherwise identical piece of land, they both pay the same tax, giving the second property owner more incentive to build.
You only do this in the places where you want everything to become skyscrapers. There is no real need for it in Des Monies or other places that already have reasonable housing costs.
The difference between this and property tax is that if you have a 12 story building on one piece of land and a 2 story building on the adjacent one, otherwise identical piece of land, they both pay the same tax, giving the second property owner more incentive to build.