Get the convex hull of a geometry

Supported in: Batch, Streaming

Given a valid GeoJSON input string, return a GeoJSON string that is the convex hull for the geometry. The convex hull is the smallest convex polygon containing the geometry.

Expression categories: Geospatial

Declared arguments

Expression - GeoJSON values for which the convex hull is calculated.
Expression<Geometry>

Output type: Geometry

Examples

Example 1: Base case

Argument values:

Expression: geometry

geometry	Output
{"type":"Polygon","coordinates":[[[0.0,0.0],[2.0,0.0],[2.0,1.0],[1.0,1.0],[1.0,2.0],[0.0,2.0],[0.0,0.0]]]}	{"type":"Polygon", "coordinates":[[[0.0, 0.0], [0.0, 2.0], [1.0, 2.0], [2.0, 1.0], [2.0, 0.0], [0.0, 0.0]]]}
null	null

Example 2: Base case

Argument values:

Expression: geometry

geometry	Output
{"type":"Polygon","coordinates":[[[0.0,0.0],[1.0,0.0],[0.0,1.0],[0.0,0.0]]]}	{"type":"Polygon","coordinates":[[[0.0, 0.0], [0.0, 1.0], [1.0, 0.0], [0.0, 0.0]]]}

Example 3: Base case

Argument values:

Expression: geometry

geometry	Output
{"type":"MultiPolygon","coordinates":[[[[0.0,0.0],[1.0,0.0],[1.0,1.0],[0.0,1.0],[0.0,0.0]]],[[[2.0,0.0],[3.0,0.0],[3.0,1.0],[2.0,1.0],[2.0,0.0]]]]}	{"type":"Polygon", "coordinates":[[[0.0, 0.0], [0.0, 1.0], [3.0, 1.0], [3.0, 0.0],[0.0, 0.0]]]}

Example 4: Base case

Argument values:

Expression: geometry

geometry	Output
{"type":"MultiPoint","coordinates":[[0.0,0.0],[0.0,1.0],[2.0,0.0], [2.0,1.0]]}	{"type":"Polygon","coordinates":[[[0.0, 0.0], [0.0, 1.0], [2.0, 1.0], [2.0, 0.0], [0.0, 0.0]]]}