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ee.Geometry.LinearRing.convexHull

Page Summary

The convex hull of a geometry is returned, which can be a point, line, or polygon depending on the input geometry.
The method is applied to a geometry object.
Optional arguments include maxError for tolerated error during reprojection and proj for specifying the projection.

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
`LinearRing. 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 LinearRing object. 
 var 
  
 linearRing 
  
 = 
  
 ee 
 . 
 Geometry 
 . 
 LinearRing 
 ( 
  
 [[ 
 - 
 122.091 
 , 
  
 37.420 
 ], 
  
 [ 
 - 
 122.085 
 , 
  
 37.422 
 ], 
  
 [ 
 - 
 122.080 
 , 
  
 37.430 
 ]]); 
 // Apply the convexHull method to the LinearRing object. 
 var 
  
 linearRingConvexHull 
  
 = 
  
 linearRing 
 . 
 convexHull 
 ({ 
 'maxError' 
 : 
  
 1 
 }); 
 // Print the result to the console. 
 print 
 ( 
 'linearRing.convexHull(...) =' 
 , 
  
 linearRingConvexHull 
 ); 
 // Display relevant geometries on the map. 
 Map 
 . 
 setCenter 
 ( 
 - 
 122.085 
 , 
  
 37.422 
 , 
  
 15 
 ); 
 Map 
 . 
 addLayer 
 ( 
 linearRing 
 , 
  
 { 
 'color' 
 : 
  
 'black' 
 }, 
  
 'Geometry [black]: linearRing' 
 ); 
 Map 
 . 
 addLayer 
 ( 
 linearRingConvexHull 
 , 
  
 { 
 'color' 
 : 
  
 'red' 
 }, 
  
 'Result [red]: linearRing.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 LinearRing object. 
 linearring 
 = 
 ee 
 . 
 Geometry 
 . 
 LinearRing 
 ( 
 [[ 
 - 
 122.091 
 , 
 37.420 
 ], 
 [ 
 - 
 122.085 
 , 
 37.422 
 ], 
 [ 
 - 
 122.080 
 , 
 37.430 
 ]] 
 ) 
 # Apply the convexHull method to the LinearRing object. 
 linearring_convex_hull 
 = 
 linearring 
 . 
 convexHull 
 ( 
 maxError 
 = 
 1 
 ) 
 # Print the result. 
 display 
 ( 
 'linearring.convexHull(...) =' 
 , 
 linearring_convex_hull 
 ) 
 # Display relevant geometries on the map. 
 m 
 = 
 geemap 
 . 
 Map 
 () 
 m 
 . 
 set_center 
 ( 
 - 
 122.085 
 , 
 37.422 
 , 
 15 
 ) 
 m 
 . 
 add_layer 
 ( 
 linearring 
 , 
 { 
 'color' 
 : 
 'black' 
 }, 
 'Geometry [black]: linearring' 
 ) 
 m 
 . 
 add_layer 
 ( 
 linearring_convex_hull 
 , 
 { 
 'color' 
 : 
 'red' 
 }, 
 'Result [red]: linearring.convexHull' 
 , 
 ) 
 m

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Page Summary

Examples

Code Editor (JavaScript)

Colab (Python)

ee.Geometry.LinearRing.convexHull