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ee.ImageCollection.toDictionary
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。
从要素中提取属性作为字典。
用法 | 返回 |
---|
ImageCollection.toDictionary(properties) | 字典 |
参数 | 类型 | 详细信息 |
---|
此:element | 元素 | 要从中提取属性的要素。 |
properties | 列表,默认值:null | 要提取的属性列表。默认为所有非系统属性。 |
示例
代码编辑器 (JavaScript)
// A contrived, empty image collection for simple demonstration.
var col = ee.ImageCollection([]);
print('Collection without properties', col);
// Set collection properties using a dictionary.
col = col.set({
project_name: 'biomass_tracking',
project_id: 3,
plot_ids: ee.Array([7, 11, 20])
});
// Set collection properties using a series of key-value pairs.
col = col.set('project_year', 2018,
'rgb_vis', 'false_color');
print('Collection with properties', col);
// Get a dictionary of collection property keys and values.
print('Property keys and values (ee.Dictionary)', col.toDictionary());
// Get the value of a collection property. To use the result of
// ee.ImageCollection.get in further computation, you need to cast it to the
// appropriate class, for example, ee.Number(result) or ee.String(result).
print('Project ID (ambiguous object)', col.get('project_id'));
// Get the value of a string collection property as an ee.String object.
print('Project name (ee.String)', col.getString('project_name'));
// Get the value of a numeric collection property as an ee.Number object.
print('Project year (ee.Number)', col.getNumber('project_year'));
// Get the value of an ee.Array collection property as an ee.Array object.
print('Plot IDs (ee.Array)', col.getArray('plot_ids'));
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)
# A contrived, empty image collection for simple demonstration.
col = ee.ImageCollection([])
print('Collection without properties:', col.getInfo())
# Set collection properties using a dictionary.
col = col.set({
'project_name': 'biomass_tracking',
'project_id': 3,
'plot_ids': ee.Array([7, 11, 20])
})
# Set collection properties using a series of key-value pairs.
col = col.set('project_year', 2018,
'rgb_vis', 'false_color')
print('Collection with properties:', col.getInfo())
# Get a dictionary of collection property keys and values.
print('Property keys and values (ee.Dictionary):', col.toDictionary().getInfo())
# Get the value of a collection property. To use the result of
# ee.ImageCollection.get in further computation, you need to cast it to the
# appropriate class, for example, ee.Number(result) or ee.String(result).
print('Project ID (ambiguous object):', col.get('project_id').getInfo())
# Get the value of a string collection property as an ee.String object.
print('Project name (ee.String):', col.getString('project_name').getInfo())
# Get the value of a numeric collection property as an ee.Number object.
print('Project year (ee.Number):', col.getNumber('project_year').getInfo())
# Get the value of an ee.Array collection property as an ee.Array object.
print('Plot IDs (ee.Array):', col.getArray('plot_ids').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。"],[],["The `ImageCollection.toDictionary()` method extracts properties from a feature, returning them as a dictionary. You must provide a list of `properties`; otherwise, it will default to all non-system properties. Properties can be added to an image collection with `set()`. Individual property values can be retrieved using `get()`, `getString()`, `getNumber()`, or `getArray()`, and then must be cast into the appropriate data type.\n"],null,[]]