How is the geometry of the oceans determined ?
The following list contains commonly used functions built into PostGIS , a free geodatabase which is a PostgreSQL extension ( the term ' geometry ' refers to a point , line , box or other two or three dimensional shape ) :Function prototype : " functionName ( parameter ( s )) : return type " Distance ( geometry , geometry ) : number Equals ( geometry , geometry ) : boolean Disjoint ( geometry , geometry ) : boolean Intersects ( geometry , geometry ) : boolean Touches ( geometry , geometry ) : boolean Crosses ( geometry , geometry ) : boolean Overlaps ( geometry , geometry ) : boolean Contains ( geometry , geometry ) : boolean Length ( geometry ) : number Area ( geometry ) : number Centroid ( geometry ) : geometry