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ee.FeatureCollection.union
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
將指定集合中的所有幾何體合併為一個，並傳回集合，其中包含單一特徵，且只有「union_result」的 ID 和幾何體。
| 用量 | 傳回 |
|---|
FeatureCollection.union(maxError) | FeatureCollection |
| 引數 | 類型 | 詳細資料 |
|---|
這個：collection | FeatureCollection | 要合併的集合。 |
maxError | ErrorMargin，預設值：null | 執行任何必要重投影時允許的最大誤差。如未指定，預設為輸出內容要求的誤差範圍。 |
範例
程式碼編輯器 (JavaScript)
// FeatureCollection of power plants in Belgium.
var fc = ee.FeatureCollection('WRI/GPPD/power_plants')
.filter('country_lg == "Belgium"');
print('Original FeatureCollection', fc);
// Merge all geometries into one. A FeatureCollection with a single feature
// with no properties is returned.
print('All geometries merged into one', fc.union(1));
Python 設定
請參閱
Python 環境頁面，瞭解 Python API 和如何使用 geemap 進行互動式開發。
import ee
import geemap.core as geemap
Colab (Python)
# FeatureCollection of power plants in Belgium.
fc = ee.FeatureCollection('WRI/GPPD/power_plants').filter(
'country_lg == "Belgium"')
print('Original FeatureCollection:', fc.getInfo())
# Merge all geometries into one. A FeatureCollection with a single feature
# with no properties is returned.
print('All geometries merged into one:', fc.union(1).getInfo())
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上次更新時間：2025-07-26 (世界標準時間)。
[null,null,["上次更新時間：2025-07-26 (世界標準時間)。"],[[["\u003cp\u003e\u003ccode\u003eunion()\u003c/code\u003e merges all geometries within a FeatureCollection into a single geometry, returning a new FeatureCollection containing one feature with an ID of 'union_result'.\u003c/p\u003e\n"],["\u003cp\u003eThe resulting FeatureCollection from \u003ccode\u003eunion()\u003c/code\u003e will only have the merged geometry and an ID, discarding any original properties from the input features.\u003c/p\u003e\n"],["\u003cp\u003eAn optional \u003ccode\u003emaxError\u003c/code\u003e argument can be used to specify the maximum allowed error for reprojection during the merge process.\u003c/p\u003e\n"]]],[],null,["# ee.FeatureCollection.union\n\nMerges all geometries in a given collection into one and returns a collection containing a single feature with only an ID of 'union_result' and a geometry.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------------------------|-------------------|\n| FeatureCollection.union`(`*maxError*`)` | FeatureCollection |\n\n| Argument | Type | Details |\n|--------------------|----------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------|\n| this: `collection` | FeatureCollection | The collection being merged. |\n| `maxError` | ErrorMargin, default: null | The maximum error allowed when performing any necessary reprojections. If not specified, defaults to the error margin requested from the output. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// FeatureCollection of power plants in Belgium.\nvar fc = ee.FeatureCollection('WRI/GPPD/power_plants')\n .filter('country_lg == \"Belgium\"');\n\nprint('Original FeatureCollection', fc);\n\n// Merge all geometries into one. A FeatureCollection with a single feature\n// with no properties is returned.\nprint('All geometries merged into one', fc.union(1));\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# FeatureCollection of power plants in Belgium.\nfc = ee.FeatureCollection('WRI/GPPD/power_plants').filter(\n 'country_lg == \"Belgium\"')\n\nprint('Original FeatureCollection:', fc.getInfo())\n\n# Merge all geometries into one. A FeatureCollection with a single feature\n# with no properties is returned.\nprint('All geometries merged into one:', fc.union(1).getInfo())\n```"]]
