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ee.Geometry.MultiLineString.convexHull

  • TheconvexHull method returns the convex hull of a given geometry, which can be a point, line, or polygon depending on the input.

  • For collinear points, the convex hull is a line, and a degenerate polygon with vertices on the same line results in a line segment.

  • The method can take optionalmaxError andproj arguments for specifying tolerance and 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.

UsageReturns
MultiLineString.convexHull(maxError,proj)Geometry
ArgumentTypeDetails
this:geometryGeometryCalculates the convex hull of this geometry.
maxErrorErrorMargin, default: nullThe maximum amount of error tolerated when performing any necessary reprojection.
projProjection, default: nullThe 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 MultiLineString object.varmultiLineString=ee.Geometry.MultiLineString([[[-122.088,37.418],[-122.086,37.422],[-122.082,37.418]],[[-122.087,37.416],[-122.083,37.416],[-122.082,37.419]]]);// Apply the convexHull method to the MultiLineString object.varmultiLineStringConvexHull=multiLineString.convexHull({'maxError':1});// Print the result to the console.print('multiLineString.convexHull(...) =',multiLineStringConvexHull);// Display relevant geometries on the map.Map.setCenter(-122.085,37.422,15);Map.addLayer(multiLineString,{'color':'black'},'Geometry [black]: multiLineString');Map.addLayer(multiLineStringConvexHull,{'color':'red'},'Result [red]: multiLineString.convexHull');

Python setup

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

importeeimportgeemap.coreasgeemap

Colab (Python)

# Define a MultiLineString object.multilinestring=ee.Geometry.MultiLineString([[[-122.088,37.418],[-122.086,37.422],[-122.082,37.418]],[[-122.087,37.416],[-122.083,37.416],[-122.082,37.419]],])# Apply the convexHull method to the MultiLineString object.multilinestring_convex_hull=multilinestring.convexHull(maxError=1)# Print the result.display('multilinestring.convexHull(...) =',multilinestring_convex_hull)# Display relevant geometries on the map.m=geemap.Map()m.set_center(-122.085,37.422,15)m.add_layer(multilinestring,{'color':'black'},'Geometry [black]: multilinestring')m.add_layer(multilinestring_convex_hull,{'color':'red'},'Result [red]: multilinestring.convexHull',)m

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Last updated 2024-07-13 UTC.