ee.Geometry.Point.convexHull

  • Returns the outer boundary of a given geometry, encompassing all its points.

  • The output can be a point, line, or polygon depending on the input geometry.

  • Accepts optional parameters for error tolerance (maxError) and projection (proj).

  • Can be applied to any Geometry object in Earth Engine.

 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
Point.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 Point object.
var point = ee.Geometry.Point(-122.082, 37.42);

// Apply the convexHull method to the Point object.
var pointConvexHull = point.convexHull({'maxError': 1});

// Print the result to the console.
print('point.convexHull(...) =', pointConvexHull);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(point,
             {'color': 'black'},
             'Geometry [black]: point');
Map.addLayer(pointConvexHull,
             {'color': 'red'},
             'Result [red]: point.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 Point object.
point = ee.Geometry.Point(-122.082, 37.42)

# Apply the convexHull method to the Point object.
point_convex_hull = point.convexHull(maxError=1)

# Print the result.
display('point.convexHull(...) =', point_convex_hull)

# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(point, {'color': 'black'}, 'Geometry [black]: point')
m.add_layer(
    point_convex_hull, {'color': 'red'}, 'Result [red]: point.convexHull'
)
m