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ee.Geometry.LinearRing.dissolve
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。
返回几何图形的并集。这会使单个几何图形保持不变,并合并多个几何图形。
用法 | 返回 |
---|
LinearRing.dissolve(maxError, proj) | 几何图形 |
参数 | 类型 | 详细信息 |
---|
此:geometry | 几何图形 | 要进行并集的几何图形。 |
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,则在此投影中执行并集。否则,将在球面坐标系中执行。 |
示例
代码编辑器 (JavaScript)
// Define a LinearRing object.
var linearRing = ee.Geometry.LinearRing(
[[-122.091, 37.420],
[-122.085, 37.422],
[-122.080, 37.430]]);
// Apply the dissolve method to the LinearRing object.
var linearRingDissolve = linearRing.dissolve({'maxError': 1});
// Print the result to the console.
print('linearRing.dissolve(...) =', linearRingDissolve);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(linearRing,
{'color': 'black'},
'Geometry [black]: linearRing');
Map.addLayer(linearRingDissolve,
{'color': 'red'},
'Result [red]: linearRing.dissolve');
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 LinearRing object.
linearring = ee.Geometry.LinearRing(
[[-122.091, 37.420], [-122.085, 37.422], [-122.080, 37.430]]
)
# Apply the dissolve method to the LinearRing object.
linearring_dissolve = linearring.dissolve(maxError=1)
# Print the result.
display('linearring.dissolve(...) =', linearring_dissolve)
# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(linearring, {'color': 'black'}, 'Geometry [black]: linearring')
m.add_layer(
linearring_dissolve, {'color': 'red'}, 'Result [red]: linearring.dissolve'
)
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 union of the geometry, leaving single geometries untouched and uniting multi-geometries.\u003c/p\u003e\n"],["\u003cp\u003eAccepts optional \u003ccode\u003emaxError\u003c/code\u003e and \u003ccode\u003eproj\u003c/code\u003e parameters to control reprojection during the union operation.\u003c/p\u003e\n"],["\u003cp\u003eCan be applied to LinearRing geometries to dissolve them into a single geometry.\u003c/p\u003e\n"]]],["The `dissolve` method unions geometries, leaving single geometries unchanged and handling multi-geometries. It takes an optional `maxError` argument, controlling reprojection error tolerance, and a `proj` argument to specify the output projection, defaulting to spherical. The method is applied to a geometry object (`LinearRing` in the examples). It is shown in both javascript and python examples, with visual output of before and after on a map.\n"],null,["# ee.Geometry.LinearRing.dissolve\n\nReturns the union of the geometry. This leaves single geometries untouched, and unions multi geometries.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|------------------------------------------------|----------|\n| LinearRing.dissolve`(`*maxError* `, `*proj*`)` | Geometry |\n\n| Argument | Type | Details |\n|------------------|----------------------------|--------------------------------------------------------------------------------------------------------------------------------|\n| this: `geometry` | Geometry | The geometry to union. |\n| `maxError` | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |\n| `proj` | Projection, default: null | If specified, the union will be performed in this projection. Otherwise it will be performed in a spherical coordinate system. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Define a LinearRing object.\nvar linearRing = ee.Geometry.LinearRing(\n [[-122.091, 37.420],\n [-122.085, 37.422],\n [-122.080, 37.430]]);\n\n// Apply the dissolve method to the LinearRing object.\nvar linearRingDissolve = linearRing.dissolve({'maxError': 1});\n\n// Print the result to the console.\nprint('linearRing.dissolve(...) =', linearRingDissolve);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(linearRing,\n {'color': 'black'},\n 'Geometry [black]: linearRing');\nMap.addLayer(linearRingDissolve,\n {'color': 'red'},\n 'Result [red]: linearRing.dissolve');\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 LinearRing object.\nlinearring = ee.Geometry.LinearRing(\n [[-122.091, 37.420], [-122.085, 37.422], [-122.080, 37.430]]\n)\n\n# Apply the dissolve method to the LinearRing object.\nlinearring_dissolve = linearring.dissolve(maxError=1)\n\n# Print the result.\ndisplay('linearring.dissolve(...) =', linearring_dissolve)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(linearring, {'color': 'black'}, 'Geometry [black]: linearring')\nm.add_layer(\n linearring_dissolve, {'color': 'red'}, 'Result [red]: linearring.dissolve'\n)\nm\n```"]]