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ee.Geometry.LineString.centroid

  • The centroid method returns a point at the center of the highest-dimension components of a geometry, ignoring lower-dimensional components.

  • TheLineString.centroid() method returns a Geometry.

  • ThemaxError argument specifies the maximum error tolerated during reprojection, and theproj argument specifies the output projection.

  • Examples are provided in both JavaScript and Python for calculating and displaying the centroid of a LineString.

 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
LineString.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 LineString object.varlineString=ee.Geometry.LineString([[-122.09,37.42],[-122.08,37.43]]);// Apply the centroid method to the LineString object.varlineStringCentroid=lineString.centroid({'maxError':1});// Print the result to the console.print('lineString.centroid(...) =',lineStringCentroid);// Display relevant geometries on the map.Map.setCenter(-122.085,37.422,15);Map.addLayer(lineString,{'color':'black'},'Geometry [black]: lineString');Map.addLayer(lineStringCentroid,{'color':'red'},'Result [red]: lineString.centroid');

Python setup

See the Python Environment page for information on the Python API and usinggeemap for interactive development.

importeeimportgeemap.coreasgeemap

Colab (Python)

# Define a LineString object.linestring=ee.Geometry.LineString([[-122.09,37.42],[-122.08,37.43]])# Apply the centroid method to the LineString object.linestring_centroid=linestring.centroid(maxError=1)# Print the result.display('linestring.centroid(...) =',linestring_centroid)# Display relevant geometries on the map.m=geemap.Map()m.set_center(-122.085,37.422,15)m.add_layer(linestring,{'color':'black'},'Geometry [black]: linestring')m.add_layer(linestring_centroid,{'color':'red'},'Result [red]: linestring.centroid')m

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Last updated 2024-06-05 UTC.