ee.Geometry.MultiPolygon.centroid
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Gibt einen Punkt in der Mitte der Komponenten mit der höchsten Dimension der Geometrie zurück. Komponenten mit niedrigerer Dimension werden ignoriert. Der Schwerpunkt einer Geometrie mit zwei Polygonen, drei Linien und einem Punkt entspricht also dem Schwerpunkt einer Geometrie, die nur die beiden Polygone enthält.
Nutzung | Ausgabe |
---|
MultiPolygon.centroid(maxError, proj) | Geometrie |
Argument | Typ | Details |
---|
So gehts: geometry | Geometrie | Berechnet den Schwerpunkt dieser Geometrie. |
maxError | ErrorMargin, Standardwert: null | Die maximale Fehlergröße, die bei einer erforderlichen Rückprojektion toleriert wird. |
proj | Projektion, Standardwert: null | Falls angegeben, wird das Ergebnis in dieser Projektion zurückgegeben. Andernfalls wird EPSG:4326 verwendet. |
Beispiele
Code-Editor (JavaScript)
// Define a MultiPolygon object.
var multiPolygon = ee.Geometry.MultiPolygon(
[[[[-122.092, 37.424],
[-122.086, 37.418],
[-122.079, 37.425],
[-122.085, 37.423]]],
[[[-122.081, 37.417],
[-122.086, 37.421],
[-122.089, 37.416]]]]);
// Apply the centroid method to the MultiPolygon object.
var multiPolygonCentroid = multiPolygon.centroid({'maxError': 1});
// Print the result to the console.
print('multiPolygon.centroid(...) =', multiPolygonCentroid);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(multiPolygon,
{'color': 'black'},
'Geometry [black]: multiPolygon');
Map.addLayer(multiPolygonCentroid,
{'color': 'red'},
'Result [red]: multiPolygon.centroid');
Python einrichten
Informationen zur Python API und zur Verwendung von geemap
für die interaktive Entwicklung finden Sie auf der Seite
Python-Umgebung.
import ee
import geemap.core as geemap
Colab (Python)
# Define a MultiPolygon object.
multipolygon = ee.Geometry.MultiPolygon([
[[
[-122.092, 37.424],
[-122.086, 37.418],
[-122.079, 37.425],
[-122.085, 37.423],
]],
[[[-122.081, 37.417], [-122.086, 37.421], [-122.089, 37.416]]],
])
# Apply the centroid method to the MultiPolygon object.
multipolygon_centroid = multipolygon.centroid(maxError=1)
# Print the result.
display('multipolygon.centroid(...) =', multipolygon_centroid)
# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(
multipolygon, {'color': 'black'}, 'Geometry [black]: multipolygon'
)
m.add_layer(
multipolygon_centroid,
{'color': 'red'},
'Result [red]: multipolygon.centroid',
)
m
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Zuletzt aktualisiert: 2025-07-26 (UTC).
[null,null,["Zuletzt aktualisiert: 2025-07-26 (UTC)."],[[["\u003cp\u003eReturns a point representing the center of the highest-dimension components within a geometry, ignoring lower dimensions.\u003c/p\u003e\n"],["\u003cp\u003eAccepts optional \u003ccode\u003emaxError\u003c/code\u003e and \u003ccode\u003eproj\u003c/code\u003e arguments for error tolerance during reprojection and specifying the output projection, respectively.\u003c/p\u003e\n"],["\u003cp\u003eThe default projection for the returned centroid is EPSG:4326 if \u003ccode\u003eproj\u003c/code\u003e is not specified.\u003c/p\u003e\n"],["\u003cp\u003eCan be applied to MultiPolygon objects to calculate their center point.\u003c/p\u003e\n"]]],["The `centroid()` method calculates the center point of a geometry's highest-dimensional components, ignoring lower-dimensional ones. It accepts `maxError` for reprojection tolerance and `proj` for specifying the output projection. By default it returns a Geometry in EPSG:4326. Example provided how to generate the centroid of a `MultiPolygon` using both JavaScript and Python code. The example code displays the input polygon and the resulting centroid on a map.\n"],null,["# ee.Geometry.MultiPolygon.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| MultiPolygon.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 MultiPolygon object.\nvar multiPolygon = ee.Geometry.MultiPolygon(\n [[[[-122.092, 37.424],\n [-122.086, 37.418],\n [-122.079, 37.425],\n [-122.085, 37.423]]],\n [[[-122.081, 37.417],\n [-122.086, 37.421],\n [-122.089, 37.416]]]]);\n\n// Apply the centroid method to the MultiPolygon object.\nvar multiPolygonCentroid = multiPolygon.centroid({'maxError': 1});\n\n// Print the result to the console.\nprint('multiPolygon.centroid(...) =', multiPolygonCentroid);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(multiPolygon,\n {'color': 'black'},\n 'Geometry [black]: multiPolygon');\nMap.addLayer(multiPolygonCentroid,\n {'color': 'red'},\n 'Result [red]: multiPolygon.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 MultiPolygon object.\nmultipolygon = ee.Geometry.MultiPolygon([\n [[\n [-122.092, 37.424],\n [-122.086, 37.418],\n [-122.079, 37.425],\n [-122.085, 37.423],\n ]],\n [[[-122.081, 37.417], [-122.086, 37.421], [-122.089, 37.416]]],\n])\n\n# Apply the centroid method to the MultiPolygon object.\nmultipolygon_centroid = multipolygon.centroid(maxError=1)\n\n# Print the result.\ndisplay('multipolygon.centroid(...) =', multipolygon_centroid)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(\n multipolygon, {'color': 'black'}, 'Geometry [black]: multipolygon'\n)\nm.add_layer(\n multipolygon_centroid,\n {'color': 'red'},\n 'Result [red]: multipolygon.centroid',\n)\nm\n```"]]