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ee.Geometry.Rectangle.centroid
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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 | Rectangle.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 Rectangle object.
var rectangle = ee.Geometry.Rectangle(-122.09, 37.42, -122.08, 37.43);
// Apply the centroid method to the Rectangle object.
var rectangleCentroid = rectangle.centroid({'maxError': 1});
// Print the result to the console.
print('rectangle.centroid(...) =', rectangleCentroid);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(rectangle,
{'color': 'black'},
'Geometry [black]: rectangle');
Map.addLayer(rectangleCentroid,
{'color': 'red'},
'Result [red]: rectangle.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 Rectangle object.
rectangle = ee.Geometry.Rectangle(-122.09, 37.42, -122.08, 37.43)
# Apply the centroid method to the Rectangle object.
rectangle_centroid = rectangle.centroid(maxError=1)
# Print the result.
display('rectangle.centroid(...) =', rectangle_centroid)
# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(rectangle, {'color': 'black'}, 'Geometry [black]: rectangle')
m.add_layer(
rectangle_centroid, {'color': 'red'}, 'Result [red]: rectangle.centroid'
)
m
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Last updated 2024-06-05 UTC.
[null,null,["Last updated 2024-06-05 UTC."],[[["\u003cp\u003e\u003ccode\u003ecentroid()\u003c/code\u003e returns a point representing the center of the highest dimension components within a geometry, ignoring lower dimensions.\u003c/p\u003e\n"],["\u003cp\u003eThe function prioritizes polygons over lines or points when calculating the center.\u003c/p\u003e\n"],["\u003cp\u003eIt accepts optional \u003ccode\u003emaxError\u003c/code\u003e and \u003ccode\u003eproj\u003c/code\u003e parameters for controlling reprojection and output projection.\u003c/p\u003e\n"],["\u003cp\u003eThe returned point can be accessed as a Geometry object.\u003c/p\u003e\n"]]],["The `centroid` method calculates the center point of a geometry's highest-dimension components, ignoring lower-dimensional ones. It accepts `maxError` to define the tolerated reprojection error and `proj` to specify the output projection; otherwise, it defaults to EPSG:4326. For example, applying `centroid` to a rectangle returns its center point. The method's result, which is a `Geometry` object, can be printed and displayed on a map, as shown in JavaScript and Python code examples.\n"],null,["# ee.Geometry.Rectangle.centroid\n\nReturns 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.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------------------------------|----------|\n| Rectangle.centroid`(`*maxError* `, `*proj*`)` | Geometry |\n\n| Argument | Type | Details |\n|------------------|----------------------------|-----------------------------------------------------------------------------------------|\n| this: `geometry` | Geometry | Calculates the centroid of this geometry. |\n| `maxError` | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |\n| `proj` | Projection, default: null | If specified, the result will be in this projection. Otherwise it will be in EPSG:4326. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Define a Rectangle object.\nvar rectangle = ee.Geometry.Rectangle(-122.09, 37.42, -122.08, 37.43);\n\n// Apply the centroid method to the Rectangle object.\nvar rectangleCentroid = rectangle.centroid({'maxError': 1});\n\n// Print the result to the console.\nprint('rectangle.centroid(...) =', rectangleCentroid);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(rectangle,\n {'color': 'black'},\n 'Geometry [black]: rectangle');\nMap.addLayer(rectangleCentroid,\n {'color': 'red'},\n 'Result [red]: rectangle.centroid');\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\n# Define a Rectangle object.\nrectangle = ee.Geometry.Rectangle(-122.09, 37.42, -122.08, 37.43)\n\n# Apply the centroid method to the Rectangle object.\nrectangle_centroid = rectangle.centroid(maxError=1)\n\n# Print the result.\ndisplay('rectangle.centroid(...) =', rectangle_centroid)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(rectangle, {'color': 'black'}, 'Geometry [black]: rectangle')\nm.add_layer(\n rectangle_centroid, {'color': 'red'}, 'Result [red]: rectangle.centroid'\n)\nm\n```"]]