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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.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-06-05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```"]]
