AI-generated Key Takeaways
-
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 optionalmaxError
andproj
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.
Usage | Returns |
---|---|
Point.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 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');
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