It really depends on where the land is as it's based on value. If you are talking about replacing property taxes with land value taxes typically it's just a rate on the value but in this case it's just the land value so a higher rate but only applies to land. If you could figure out the total land value in your neighbourhood you could figure it out.
As for who is affected, single family homes on the outskirts probably see a drop in taxes while those in the inner city and vacant plots see a large increase.