ee.Geometry.Polygon.convexHull

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
Polygon.convexHull(maxError, proj)Geometry
ArgumentTypeDetails
this: geometryGeometry

Calculates the convex hull of this geometry.

maxErrorErrorMargin, default: null

The maximum amount of error tolerated when performing any necessary reprojection.

projProjection, 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 Polygon object.
var polygon = ee.Geometry.Polygon(
    [[[-122.092, 37.424],
      [-122.086, 37.418],
      [-122.079, 37.425],
      [-122.085, 37.423]]]);

// Apply the convexHull method to the Polygon object.
var polygonConvexHull = polygon.convexHull({'maxError': 1});

// Print the result to the console.
print('polygon.convexHull(...) =', polygonConvexHull);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(polygon,
             {'color': 'black'},
             'Geometry [black]: polygon');
Map.addLayer(polygonConvexHull,
             {'color': 'red'},
             'Result [red]: polygon.convexHull');