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st_makeenvelope function

Applies to: check marked yes Databricks Runtime 18.2 and above

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Returns a GEOMETRY value representing the 2D axis-aligned envelope (minimum bounding box) defined by the two corner coordinates (x1, y1) and (x2, y2).

Syntax​

st_makeenvelope ( x1, y1, x2, y2 )

Arguments​

  • x1: A DOUBLE value, representing the X coordinate of the first corner.
  • y1: A DOUBLE value, representing the Y coordinate of the first corner.
  • x2: A DOUBLE value, representing the X coordinate of the second corner.
  • y2: A DOUBLE value, representing the Y coordinate of the second corner.

Returns​

A value of type GEOMETRY, representing the 2D axis-aligned envelope of the two input corners. The SRID of the returned geometry is 0.

The input corners may be provided in any order; the resulting envelope is the same as if the corners were normalized to (xmin, ymin) and (xmax, ymax).

The type of the returned geometry depends on the input corners:

  • If the box degenerates to a single point (x1 = x2 and y1 = y2), the result is a point.
  • If the box degenerates to a segment (x1 = x2 or y1 = y2, but not both), the result is a linestring with two points.
  • Otherwise, the result is a polygon with five vertices (closed ring).

The function returns NULL if any of the inputs is NULL.

Examples​

SQL
-- Returns the polygon envelope defined by two corners.
> SELECT st_astext(st_makeenvelope(1.0, 2.0, 4.0, 6.0));
  POLYGON((1 2,1 6,4 6,4 2,1 2))
-- Corners may be provided in any order.
> SELECT st_astext(st_makeenvelope(4.0, 6.0, 1.0, 2.0));
  POLYGON((1 2,1 6,4 6,4 2,1 2))
-- Returns a point when the box degenerates to a point.
> SELECT st_astext(st_makeenvelope(3.0, 5.0, 3.0, 5.0));
  POINT(3 5)
-- Returns a linestring when the box degenerates to a horizontal segment.
> SELECT st_astext(st_makeenvelope(1.0, 0.0, 4.0, 0.0));
  LINESTRING(1 0,4 0)
-- Returns a linestring when the box degenerates to a vertical segment.
> SELECT st_astext(st_makeenvelope(0.0, 2.0, 0.0, 7.0));
  LINESTRING(0 2,0 7)
-- The SRID of the returned geometry is always 0.
> SELECT st_srid(st_makeenvelope(0.0, 0.0, 10.0, 10.0));
  0
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