Announcement: On November 13, 2024, all users will need to use a Cloud project in order to access Earth Engine. After this date, continued individual access without a Cloud project will require an exception.

ee.Geometry.MultiLineString.centroid

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.

Usage	Returns
`MultiLineString.centroid(maxError, proj)`	Geometry

Argument	Type	Details
this: `geometry`	Geometry	Calculates the centroid of this geometry.
`maxError`	ErrorMargin, default: null	The maximum amount of error tolerated when performing any necessary reprojection.
`proj`	Projection, default: null	If specified, the result will be in this projection. Otherwise it will be in EPSG:4326.

Examples

Code Editor (JavaScript)

// Define a MultiLineString object.
var multiLineString = ee.Geometry.MultiLineString(
   [[[-122.088, 37.418], [-122.086, 37.422], [-122.082, 37.418]],
    [[-122.087, 37.416], [-122.083, 37.416], [-122.082, 37.419]]]);

// Apply the centroid method to the MultiLineString object.
var multiLineStringCentroid = multiLineString.centroid({'maxError': 1});

// Print the result to the console.
print('multiLineString.centroid(...) =', multiLineStringCentroid);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(multiLineString,
             {'color': 'black'},
             'Geometry [black]: multiLineString');
Map.addLayer(multiLineStringCentroid,
             {'color': 'red'},
             'Result [red]: multiLineString.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 MultiLineString object.
multilinestring = ee.Geometry.MultiLineString([
    [[-122.088, 37.418], [-122.086, 37.422], [-122.082, 37.418]],
    [[-122.087, 37.416], [-122.083, 37.416], [-122.082, 37.419]],
])

# Apply the centroid method to the MultiLineString object.
multilinestring_centroid = multilinestring.centroid(maxError=1)

# Print the result.
display('multilinestring.centroid(...) =', multilinestring_centroid)

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