Create geometries

The following geometry creation functions are available:

Function	Description
`ST_Accum`	Construct an array of Geometries
`ST_BoundingCircle`	Return the minimum bounding circle of a Geometry
`ST_Expand`	Expand a Geometry's envelope
`ST_MakeEllipse`	Construct an ellipse
`ST_MakeEnvelope`	Create a rectangular Polygon
`ST_MakeGrid`	Calculate a regular grid of `POLYGON`s based on a Geometry or a table of Geometries
`ST_MakeGridPoints`	Calculate a regular grid of `POINT`s based on a Geometry or a table of Geometries
`ST_MakeLine`	`(MULTI)POINT` → `LINESTRING`
`ST_MakePoint`	Construct a `POINT` from two or three coordinates
`ST_MakePolygon`	`LINESTRING` → `POLYGON`
`ST_MinimumDiameter`	Return the minimum diameter of a Geometry
`ST_MinimumRectangle`	Return the minimum rectangle enclosing a Geometry
`ST_OctogonalEnvelope`	Return the octogonal envelope of a Geometry
`ST_Point`	Construct a `POINT` from two or three coordinates
`ST_RingBuffer`	Return a `MULTIPOLYGON` of buffers centered at a Geometry and of increasing buffer Size