A system for the determination of the percentage of area of a parcel of land available for development or preservation which comprises at least one privately gathered data base having at least one file relating to at least one geographic area and its privately gathered corresponding map, physical, geographic, geologic, edaphic, and flora parameters present in and relating to said geographic area; a Software Decision Control Framework connected to the privately gathered data base; a Geographic Information System connected to and interacting with both the Software Decision Control Framework and the privately gathered data base; a network connected and interfaced to the Software Decision Control Framework and at least one data base interfaced with the network, the data base comprising physical, geographic, geologic, edaphic and flora parameters present in and relating to various geographic areas worldwide, whereby the Software Decision Control Framework interacts with the privately gathered data base, the Geographic Information System, the network and the database to provide an evaluation report which identifies, quantifies and establishes the percentage of area of the parcel of land for development and preservation in conformance to local, federal and state land use regulations and non-governmental land use policies.