I used to have this utility for hacking saved games. "civedit" I believe that is what it was called. BUT you can't edit land types (I don't even know what you are talking about with this one...) but you can change diffulity levels, money, tech, yadda, yadda, yadda....enjoy!
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"Imagine the disincentive to software development if after months of work another company could come along and copy your work and market it under its own name...without legal restraints to such copying, companies like Apple could not afford to advance the state of the art."
- Bill Gates, 1983 (New York Times, 25 Sep 1983, p. F2)