Spatial Operators

OpenGIS proposes a number of other functions that can produce geometries. They are designed to implement spatial operators.

These functions are not implemented in MySQL.

• Buffer(g,d)

  Returns a geometry that represents all points whose distance from the geometry value g is less than or equal to a distance of d.

• ConvexHull(g)

  Returns a geometry that represents the convex hull of the geometry value g.

• Difference(g1,g2)

  Returns a geometry that represents the point set difference of the geometry value g1 with g2.

• Intersection(g1,g2)

  Returns a geometry that represents the point set intersection of the geometry values g1 with g2.

• SymDifference(g1,g2)

  Returns a geometry that represents the point set symmetric difference of the geometry value g1 with g2.

• Union(g1,g2)

  Returns a geometry that represents the point set union of the geometry values g1 and g2.

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