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Sigma KEE - SurfaceGroundArea
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SurfaceGroundArea
SurfaceGroundArea is a subclass of GeographicArea that is restricted to regions whose surface is solid ground. A SurfaceGroundArea may be a discontinuous region overlapping a larger, continuous GeographicArea but excluding any WaterAreas enclosed therein. Rivers, lakes, reservoirs and other surface water areas are not part of any SurfaceGroundArea.
Relationships      
Parents 地理的地域 A geographic location, generally having definite boundaries. Note that this differs from its immediate superclass Region in that a GeographicArea is a three-dimensional Region of the earth. Accordingly, all astronomical objects other than earth and all one-dimensional and two-dimensional Regions are not classed under GeographicArea.


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