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ee.Geometry.Point.centroid
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根据您的偏好保存内容并对其进行分类。
返回几何图形的最高维度组件中心的点。系统会忽略低维度的组成部分,因此包含两个多边形、三条线和一个点的几何图形的形心与仅包含这两个多边形的几何图形的形心相同。
用法 | 返回 |
---|
Point.centroid(maxError, proj) | 几何图形 |
参数 | 类型 | 详细信息 |
---|
此:geometry | 几何图形 | 计算相应几何图形的形心。 |
maxError | ErrorMargin,默认值:null | 执行任何必要的重新投影时可容忍的最大误差量。 |
proj | 投影,默认值:null | 如果指定了此参数,结果将采用此投影。否则,它将采用 EPSG:4326。 |
示例
代码编辑器 (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');
Python 设置
如需了解 Python API 和如何使用 geemap
进行交互式开发,请参阅
Python 环境页面。
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
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最后更新时间 (UTC):2025-07-26。
[null,null,["最后更新时间 (UTC):2025-07-26。"],[[["\u003cp\u003eReturns a point at the center of the geometry's highest-dimension components, ignoring lower-dimensional ones.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003ecentroid()\u003c/code\u003e method can be applied to a Geometry object with optional \u003ccode\u003emaxError\u003c/code\u003e and \u003ccode\u003eproj\u003c/code\u003e parameters for error tolerance and projection, respectively.\u003c/p\u003e\n"],["\u003cp\u003eIt's primarily used to find the central point of polygons but also works for other geometries, prioritizing higher dimensions.\u003c/p\u003e\n"],["\u003cp\u003eThe resulting centroid is a Geometry object, which can be further used in analysis or visualization.\u003c/p\u003e\n"]]],[],null,["# ee.Geometry.Point.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| Point.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 Point object.\nvar point = ee.Geometry.Point(-122.082, 37.42);\n\n// Apply the centroid method to the Point object.\nvar pointCentroid = point.centroid({'maxError': 1});\n\n// Print the result to the console.\nprint('point.centroid(...) =', pointCentroid);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(point,\n {'color': 'black'},\n 'Geometry [black]: point');\nMap.addLayer(pointCentroid,\n {'color': 'red'},\n 'Result [red]: point.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 Point object.\npoint = ee.Geometry.Point(-122.082, 37.42)\n\n# Apply the centroid method to the Point object.\npoint_centroid = point.centroid(maxError=1)\n\n# Print the result.\ndisplay('point.centroid(...) =', point_centroid)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(point, {'color': 'black'}, 'Geometry [black]: point')\nm.add_layer(point_centroid, {'color': 'red'}, 'Result [red]: point.centroid')\nm\n```"]]