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ee.Geometry.perimeter
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。
返回几何图形的多边形部分的周长。多几何图形的周长是其组成部分的周长之和。
用法 | 返回 |
---|
Geometry.perimeter(maxError, proj) | 浮点数 |
参数 | 类型 | 详细信息 |
---|
此:geometry | 几何图形 | 输入几何图形。 |
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,结果将采用相应投影的坐标系的单位。否则将以米为单位。 |
示例
代码编辑器 (JavaScript)
// Define a Geometry object.
var geometry = ee.Geometry({
'type': 'Polygon',
'coordinates':
[[[-122.081, 37.417],
[-122.086, 37.421],
[-122.084, 37.418],
[-122.089, 37.416]]]
});
// Apply the perimeter method to the Geometry object.
var geometryPerimeter = geometry.perimeter({'maxError': 1});
// Print the result to the console.
print('geometry.perimeter(...) =', geometryPerimeter);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(geometry,
{'color': 'black'},
'Geometry [black]: geometry');
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 Geometry object.
geometry = ee.Geometry({
'type': 'Polygon',
'coordinates': [[
[-122.081, 37.417],
[-122.086, 37.421],
[-122.084, 37.418],
[-122.089, 37.416],
]],
})
# Apply the perimeter method to the Geometry object.
geometry_perimeter = geometry.perimeter(maxError=1)
# Print the result.
display('geometry.perimeter(...) =', geometry_perimeter)
# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(geometry, {'color': 'black'}, 'Geometry [black]: geometry')
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 the length of the perimeter of a geometry, including the sum of perimeters for multi-geometries.\u003c/p\u003e\n"],["\u003cp\u003eAccepts optional \u003ccode\u003emaxError\u003c/code\u003e and \u003ccode\u003eproj\u003c/code\u003e arguments for reprojection and unit specification.\u003c/p\u003e\n"],["\u003cp\u003eResults are in meters unless a projection is specified with the \u003ccode\u003eproj\u003c/code\u003e argument.\u003c/p\u003e\n"],["\u003cp\u003eCan be applied to \u003ccode\u003eee.Geometry\u003c/code\u003e objects in both JavaScript and Python environments within Google Earth Engine.\u003c/p\u003e\n"]]],["The `Geometry.perimeter()` method calculates the perimeter length of a geometry's polygonal parts. For multi-geometries, it sums the perimeters of each component. It accepts an optional `maxError` argument for reprojection tolerance and a `proj` argument to specify the output projection units; otherwise, it defaults to meters. The input geometry and the output length are the key information provided.\n"],null,["# ee.Geometry.perimeter\n\nReturns the length of the perimeter of the polygonal parts of the geometry. The perimeter of multi geometries is the sum of the perimeters of their components.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------------------------------|---------|\n| Geometry.perimeter`(`*maxError* `, `*proj*`)` | Float |\n\n| Argument | Type | Details |\n|------------------|----------------------------|----------------------------------------------------------------------------------------------------------------------------|\n| this: `geometry` | Geometry | The input 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 the units of the coordinate system of this projection. Otherwise it will be in meters. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Define a Geometry object.\nvar geometry = ee.Geometry({\n 'type': 'Polygon',\n 'coordinates':\n [[[-122.081, 37.417],\n [-122.086, 37.421],\n [-122.084, 37.418],\n [-122.089, 37.416]]]\n});\n\n// Apply the perimeter method to the Geometry object.\nvar geometryPerimeter = geometry.perimeter({'maxError': 1});\n\n// Print the result to the console.\nprint('geometry.perimeter(...) =', geometryPerimeter);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(geometry,\n {'color': 'black'},\n 'Geometry [black]: geometry');\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 Geometry object.\ngeometry = ee.Geometry({\n 'type': 'Polygon',\n 'coordinates': [[\n [-122.081, 37.417],\n [-122.086, 37.421],\n [-122.084, 37.418],\n [-122.089, 37.416],\n ]],\n})\n\n# Apply the perimeter method to the Geometry object.\ngeometry_perimeter = geometry.perimeter(maxError=1)\n\n# Print the result.\ndisplay('geometry.perimeter(...) =', geometry_perimeter)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(geometry, {'color': 'black'}, 'Geometry [black]: geometry')\nm\n```"]]