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ee.Geometry.Point.convexHull
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
返回给定几何图形的凸包。单个点的凸包是该点本身,共线点的凸包是一条线,而其他任何点的凸包都是一个多边形。请注意,如果退化多边形的所有顶点都位于同一条直线上,则会生成线段。
用法 | 返回 |
---|
Point.convexHull(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凸包。 |
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 | 执行操作的投影。如果未指定,则操作将在球面坐标系中执行,并且球面上的直线距离将以米为单位。 |
示例
代码编辑器 (JavaScript)
// Define a Point object.
var point = ee.Geometry.Point(-122.082, 37.42);
// Apply the convexHull method to the Point object.
var pointConvexHull = point.convexHull({'maxError': 1});
// Print the result to the console.
print('point.convexHull(...) =', pointConvexHull);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(point,
{'color': 'black'},
'Geometry [black]: point');
Map.addLayer(pointConvexHull,
{'color': 'red'},
'Result [red]: point.convexHull');
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 convexHull method to the Point object.
point_convex_hull = point.convexHull(maxError=1)
# Print the result.
display('point.convexHull(...) =', point_convex_hull)
# 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_convex_hull, {'color': 'red'}, 'Result [red]: point.convexHull'
)
m
如未另行说明,那么本页面中的内容已根据知识共享署名 4.0 许可获得了许可,并且代码示例已根据 Apache 2.0 许可获得了许可。有关详情,请参阅 Google 开发者网站政策。Java 是 Oracle 和/或其关联公司的注册商标。
最后更新时间 (UTC):2025-07-26。
[null,null,["最后更新时间 (UTC):2025-07-26。"],[[["\u003cp\u003eReturns the outer boundary of a given geometry, encompassing all its points.\u003c/p\u003e\n"],["\u003cp\u003eThe output can be a point, line, or polygon depending on the input geometry.\u003c/p\u003e\n"],["\u003cp\u003eAccepts optional parameters for error tolerance (\u003ccode\u003emaxError\u003c/code\u003e) and projection (\u003ccode\u003eproj\u003c/code\u003e).\u003c/p\u003e\n"],["\u003cp\u003eCan be applied to any Geometry object in Earth Engine.\u003c/p\u003e\n"]]],[],null,["# ee.Geometry.Point.convexHull\n\nReturns the convex hull of the given geometry. The convex hull of a single point is the point itself, the convex hull of collinear points is a line, and the convex hull of everything else is a polygon. Note that a degenerate polygon with all vertices on the same line will result in a line segment.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|---------------------------------------------|----------|\n| Point.convexHull`(`*maxError* `, `*proj*`)` | Geometry |\n\n| Argument | Type | Details |\n|------------------|----------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| this: `geometry` | Geometry | Calculates the convex hull of this geometry. |\n| `maxError` | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |\n| `proj` | Projection, default: null | The projection in which to perform the operation. If not specified, the operation will be performed in a spherical coordinate system, and linear distances will be in meters on the sphere. |\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 convexHull method to the Point object.\nvar pointConvexHull = point.convexHull({'maxError': 1});\n\n// Print the result to the console.\nprint('point.convexHull(...) =', pointConvexHull);\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(pointConvexHull,\n {'color': 'red'},\n 'Result [red]: point.convexHull');\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 convexHull method to the Point object.\npoint_convex_hull = point.convexHull(maxError=1)\n\n# Print the result.\ndisplay('point.convexHull(...) =', point_convex_hull)\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(\n point_convex_hull, {'color': 'red'}, 'Result [red]: point.convexHull'\n)\nm\n```"]]