ee.Geometry.MultiLineString.centroid

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

  • Accepts an optional maxError for reprojection and an optional proj to specify the output projection (defaults to EPSG:4326).

  • Can be applied to MultiLineString geometries to calculate their 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.

UsageReturns
MultiLineString.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 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