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ee.Geometry.LineString.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 | LineString.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 LineString object.
var lineString = ee.Geometry.LineString([[-122.09, 37.42], [-122.08, 37.43]]);
// Apply the centroid method to the LineString object.
var lineStringCentroid = 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 using
geemap for interactive development.
import ee
import geemap.core as geemap
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.
[null,null,["Last updated 2024-06-05 UTC."],[[["\u003cp\u003eReturns a point representing the center of the highest-dimension components of a geometry, ignoring lower-dimensional ones.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003ecentroid()\u003c/code\u003e method can be applied to geometries and takes optional \u003ccode\u003emaxError\u003c/code\u003e and \u003ccode\u003eproj\u003c/code\u003e arguments for customization.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003emaxError\u003c/code\u003e controls the tolerance for reprojection errors, while \u003ccode\u003eproj\u003c/code\u003e specifies the output projection (defaults to EPSG:4326).\u003c/p\u003e\n"],["\u003cp\u003eIt is demonstrated with examples using both JavaScript and Python within the Google Earth Engine environment.\u003c/p\u003e\n"]]],["The `centroid` method calculates the center point of a geometry's highest-dimensional components, disregarding lower-dimensional ones. It accepts optional `maxError` and `proj` arguments to control error tolerance and output projection. For a `LineString` object, the method returns a `Geometry` object representing the centroid. Example code shows defining a `LineString`, applying `centroid`, and visualizing both on a map. The function is shown in Javascript and Python.\n"],null,["# ee.Geometry.LineString.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| LineString.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 LineString object.\nvar lineString = ee.Geometry.LineString([[-122.09, 37.42], [-122.08, 37.43]]);\n\n// Apply the centroid method to the LineString object.\nvar lineStringCentroid = lineString.centroid({'maxError': 1});\n\n// Print the result to the console.\nprint('lineString.centroid(...) =', lineStringCentroid);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(lineString,\n {'color': 'black'},\n 'Geometry [black]: lineString');\nMap.addLayer(lineStringCentroid,\n {'color': 'red'},\n 'Result [red]: lineString.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 LineString object.\nlinestring = ee.Geometry.LineString([[-122.09, 37.42], [-122.08, 37.43]])\n\n# Apply the centroid method to the LineString object.\nlinestring_centroid = linestring.centroid(maxError=1)\n\n# Print the result.\ndisplay('linestring.centroid(...) =', linestring_centroid)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(linestring, {'color': 'black'}, 'Geometry [black]: linestring')\nm.add_layer(\n linestring_centroid, {'color': 'red'}, 'Result [red]: linestring.centroid'\n)\nm\n```"]]