ee.Geometry.centroid

  • Returns a central point based on the highest-dimension components of a geometry, ignoring lower dimensions.

  • centroid() can be applied to a Geometry object to compute its center point.

  • Optional parameters maxError and proj control reprojection tolerance and output projection, respectively.

  • The default projection for the returned centroid is EPSG:4326 if proj is not specified.

 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
Geometry.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 Geometry object.
var geometry = ee.Geometry({
  'type': 'Polygon',
  'coordinates':
    [[[-122.081, 37.417],
      [-122.086, 37.421],
      [-122.084, 37.418],
      [-122.089, 37.416]]]
});

// Apply the centroid method to the Geometry object.
var geometryCentroid = geometry.centroid({'maxError': 1});

// Print the result to the console.
print('geometry.centroid(...) =', geometryCentroid);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(geometry,
             {'color': 'black'},
             'Geometry [black]: geometry');
Map.addLayer(geometryCentroid,
             {'color': 'red'},
             'Result [red]: geometry.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 Geometry object.
geometry = ee.Geometry({
    'type': 'Polygon',
    'coordinates': [[
        [-122.081, 37.417],
        [-122.086, 37.421],
        [-122.084, 37.418],
        [-122.089, 37.416],
    ]],
})

# Apply the centroid method to the Geometry object.
geometry_centroid = geometry.centroid(maxError=1)

# Print the result.
display('geometry.centroid(...) =', geometry_centroid)

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