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ee.Geometry.MultiPoint.convexHull

AI-generated Key Takeaways

convexHull() returns the convex hull of a given geometry, which can be a point, line, or polygon depending on the input.
The method can take optional maxError and proj arguments to control reprojection and the coordinate system used for the operation.
Example code is provided in both JavaScript and Python demonstrating how to use the convexHull() method on a MultiPoint object.

Returns the convex hull of the given geometry. The convex hull of a single point is the point itself, the convex hull of collinear points is a line, and the convex hull of everything else is a polygon. Note that a degenerate polygon with all vertices on the same line will result in a line segment.

Usage	Returns
`MultiPoint. convexHull ( maxError , proj )`	Geometry

Argument	Type	Details
this: `geometry`	Geometry	Calculates the convex hull of this geometry.
`maxError`	ErrorMargin, default: null	The maximum amount of error tolerated when performing any necessary reprojection.
`proj`	Projection, default: null	The projection in which to perform the operation. If not specified, the operation will be performed in a spherical coordinate system, and linear distances will be in meters on the sphere.

Examples

Code Editor (JavaScript)

 // Define a MultiPoint object. 
 var 
  
 multiPoint 
  
 = 
  
 ee 
 . 
 Geometry 
 . 
 MultiPoint 
 ([[ 
 - 
 122.082 
 , 
  
 37.420 
 ], 
  
 [ 
 - 
 122.081 
 , 
  
 37.426 
 ]]); 
 // Apply the convexHull method to the MultiPoint object. 
 var 
  
 multiPointConvexHull 
  
 = 
  
 multiPoint 
 . 
 convexHull 
 ({ 
 'maxError' 
 : 
  
 1 
 }); 
 // Print the result to the console. 
 print 
 ( 
 'multiPoint.convexHull(...) =' 
 , 
  
 multiPointConvexHull 
 ); 
 // Display relevant geometries on the map. 
 Map 
 . 
 setCenter 
 ( 
 - 
 122.085 
 , 
  
 37.422 
 , 
  
 15 
 ); 
 Map 
 . 
 addLayer 
 ( 
 multiPoint 
 , 
  
 { 
 'color' 
 : 
  
 'black' 
 }, 
  
 'Geometry [black]: multiPoint' 
 ); 
 Map 
 . 
 addLayer 
 ( 
 multiPointConvexHull 
 , 
  
 { 
 'color' 
 : 
  
 'red' 
 }, 
  
 'Result [red]: multiPoint.convexHull' 
 );

Python setup

See the Python Environment page for information on the Python API and using geemap for interactive development.

 import 
  
 ee 
 import 
  
 geemap.core 
  
 as 
  
 geemap

Colab (Python)

 # Define a MultiPoint object. 
 multipoint 
 = 
 ee 
 . 
 Geometry 
 . 
 MultiPoint 
 ([[ 
 - 
 122.082 
 , 
 37.420 
 ], 
 [ 
 - 
 122.081 
 , 
 37.426 
 ]]) 
 # Apply the convexHull method to the MultiPoint object. 
 multipoint_convex_hull 
 = 
 multipoint 
 . 
 convexHull 
 ( 
 maxError 
 = 
 1 
 ) 
 # Print the result. 
 display 
 ( 
 'multipoint.convexHull(...) =' 
 , 
 multipoint_convex_hull 
 ) 
 # Display relevant geometries on the map. 
 m 
 = 
 geemap 
 . 
 Map 
 () 
 m 
 . 
 set_center 
 ( 
 - 
 122.085 
 , 
 37.422 
 , 
 15 
 ) 
 m 
 . 
 add_layer 
 ( 
 multipoint 
 , 
 { 
 'color' 
 : 
 'black' 
 }, 
 'Geometry [black]: multipoint' 
 ) 
 m 
 . 
 add_layer 
 ( 
 multipoint_convex_hull 
 , 
 { 
 'color' 
 : 
 'red' 
 }, 
 'Result [red]: multipoint.convexHull' 
 , 
 ) 
 m

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AI-generated Key Takeaways

Examples

Code Editor (JavaScript)

Colab (Python)

ee.Geometry.MultiPoint.convexHull