ee.Geometry.BBox.convexHull

  • Returns the smallest convex Geometry that contains all the points in the input Geometry.

  • Accepts optional arguments for maximum error and projection for reprojection.

  • Returns the input Geometry itself if it is a single point or a line.

  • A degenerate polygon with all vertices on the same line will be reduced to a line segment.

  • Useful for finding the outer boundary of a set of points or geometries.

 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
BBox.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 BBox object.
var bBox = ee.Geometry.BBox(-122.09, 37.42, -122.08, 37.43);

// Apply the convexHull method to the BBox object.
var bBoxConvexHull = bBox.convexHull({'maxError': 1});

// Print the result to the console.
print('bBox.convexHull(...) =', bBoxConvexHull);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(bBox,
             {'color': 'black'},
             'Geometry [black]: bBox');
Map.addLayer(bBoxConvexHull,
             {'color': 'red'},
             'Result [red]: bBox.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 BBox object.
bbox = ee.Geometry.BBox(-122.09, 37.42, -122.08, 37.43)

# Apply the convexHull method to the BBox object.
bbox_convex_hull = bbox.convexHull(maxError=1)

# Print the result.
display('bbox.convexHull(...) =', bbox_convex_hull)

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