ee.Geometry.Point.centroid

  • Returns a point at the center of the geometry's highest-dimension components, ignoring lower-dimensional ones.

  • The centroid() method can be applied to a Geometry object with optional maxError and proj parameters for error tolerance and projection, respectively.

  • It's primarily used to find the central point of polygons but also works for other geometries, prioritizing higher dimensions.

  • The resulting centroid is a Geometry object, which can be further used in analysis or visualization.

Returns a point at the center of the highest-dimension components of the geometry. Lower-dimensional components are ignored, so the centroid of a geometry containing two polygons, three lines and a point is equivalent to the centroid of a geometry containing just the two polygons.

UsageReturns
Point.centroid(maxError, proj)Geometry
ArgumentTypeDetails
this: geometryGeometryCalculates the centroid of this geometry.
maxErrorErrorMargin, default: nullThe maximum amount of error tolerated when performing any necessary reprojection.
projProjection, default: nullIf specified, the result will be in this projection. Otherwise it will be in EPSG:4326.

Examples

Code Editor (JavaScript)

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

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

// Print the result to the console.
print('point.centroid(...) =', pointCentroid);

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

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 centroid method to the Point object.
point_centroid = point.centroid(maxError=1)

# Print the result.
display('point.centroid(...) =', point_centroid)

# 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_centroid, {'color': 'red'}, 'Result [red]: point.centroid')
m