ee.FeatureCollection.select

从集合中的每个 Feature 中选择属性。也可以仅使用字符串实参来调用此函数；这些实参都将被解读为 propertySelectors（可变实参）。

返回具有所选属性的要素集合。

用法	返回
FeatureCollection.select(propertySelectors, newProperties, retainGeometry)	FeatureCollection

参数	类型	详细信息
此：featurecollection	FeatureCollection	FeatureCollection 实例。
propertySelectors	List[String]	一个名称或正则表达式列表，用于指定要选择的属性。
newProperties	List[String]，可选	输出属性的新名称列表。必须与所选属性的数量一致。
retainGeometry	布尔值，可选	如果为 false，结果将具有 NULL 几何图形。默认值为 true。

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"');

// Select a single property.
var singleProp = fc.select('fuel1');
print('Single property selected',
      singleProp.first());

// Select multiple properties.
var multiProp = fc.select(['fuel1', 'capacitymw']);
print('Multiple properties selected',
      multiProp.first());

// Select multiple properties and rename them.
var multiPropRename = fc.select({
  propertySelectors: ['fuel1', 'capacitymw'],
  newProperties: ['Fuel_1', 'Capacity_MW']
});
print('Multiple properties selected, renamed',
      multiPropRename.first());

// Select multiple properties, remove geometry.
var multiPropNoGeom = fc.select({
  propertySelectors: ['fuel1', 'capacitymw'],
  retainGeometry: false
});
print('Multiple properties selected, geometry removed',
      multiPropNoGeom.first());

Python 设置

如需了解 Python API 和如何使用 geemap 进行交互式开发，请访问 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"')

# Select a single property.
single_prop = fc.select('fuel1')
display('Single property selected:', single_prop.first())

# Select multiple properties.
multi_prop = fc.select(['fuel1', 'capacitymw'])
display('Multiple properties selected:', multi_prop.first())

# Select multiple properties and rename them.
multi_prop_rename = fc.select(**{
    'propertySelectors': ['fuel1', 'capacitymw'],
    'newProperties': ['Fuel_1', 'Capacity_MW']
    })
display('Multiple properties selected, renamed:',
        multi_prop_rename.first())

# Select multiple properties, remove geometry.
multi_prop_no_geom = fc.select(**{
    'propertySelectors': ['fuel1', 'capacitymw'],
    'retainGeometry': False
    })
display('Multiple properties selected, geometry removed:',
        multi_prop_no_geom.first())