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ee.FeatureCollection.size
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。
返回集合中的元素数量。
| 用法 | 返回 |
|---|
FeatureCollection.size() | 整数 |
| 参数 | 类型 | 详细信息 |
|---|
此：collection | FeatureCollection | 要统计的集合。 |
示例
代码编辑器 (JavaScript)
// FeatureCollection of power plants in Belgium.
var fc = ee.FeatureCollection('WRI/GPPD/power_plants')
.filter('country_lg == "Belgium"');
print('Number of power plants in Belgium', fc.size());
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)
# FeatureCollection of power plants in Belgium.
fc = ee.FeatureCollection('WRI/GPPD/power_plants').filter(
'country_lg == "Belgium"')
print('Number of power plants in Belgium:', fc.size().getInfo())
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 number of elements (features) within a given FeatureCollection.\u003c/p\u003e\n"],["\u003cp\u003eThe method is called using \u003ccode\u003esize()\u003c/code\u003e on a FeatureCollection and returns an Integer value.\u003c/p\u003e\n"],["\u003cp\u003eUsage examples are provided in JavaScript and Python demonstrating how to retrieve the size of a FeatureCollection.\u003c/p\u003e\n"]]],["The `size()` method calculates the number of elements within a `FeatureCollection`. It takes the collection as input and returns an integer representing the total count. For instance, when applied to a `FeatureCollection` of power plants in Belgium, `fc.size()` returns the number of power plants. Examples provided demonstrate its usage in both JavaScript and Python environments, showcasing how to retrieve and print the collection's size.\n"],null,["# ee.FeatureCollection.size\n\nReturns the number of elements in the collection.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|----------------------------|---------|\n| FeatureCollection.size`()` | Integer |\n\n| Argument | Type | Details |\n|--------------------|-------------------|--------------------------|\n| this: `collection` | FeatureCollection | The collection to count. |\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('Number of power plants in Belgium', fc.size());\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('Number of power plants in Belgium:', fc.size().getInfo())\n```"]]
