ee.ImageCollection.set
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Ghi đè một hoặc nhiều thuộc tính siêu dữ liệu của một Phần tử.
Trả về phần tử có các thuộc tính được chỉ định bị ghi đè.
Cách sử dụng | Giá trị trả về |
---|
ImageCollection.set(var_args) | Phần tử |
Đối số | Loại | Thông tin chi tiết |
---|
this: element | Phần tử | Thực thể Phần tử. |
var_args | VarArgs<Object> | Một từ điển thuộc tính hoặc một chuỗi vararg thuộc tính, ví dụ: key1, value1, key2, value2, ... |
Ví dụ
Trình soạn thảo mã (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'));
Thiết lập Python
Hãy xem trang
Môi trường Python để biết thông tin về API Python và cách sử dụng geemap
cho quá trình phát triển tương tác.
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())
Trừ phi có lưu ý khác, nội dung của trang này được cấp phép theo Giấy phép ghi nhận tác giả 4.0 của Creative Commons và các mẫu mã lập trình được cấp phép theo Giấy phép Apache 2.0. Để biết thông tin chi tiết, vui lòng tham khảo Chính sách trang web của Google Developers. Java là nhãn hiệu đã đăng ký của Oracle và/hoặc các đơn vị liên kết với Oracle.
Cập nhật lần gần đây nhất: 2025-07-25 UTC.
[null,null,["Cập nhật lần gần đây nhất: 2025-07-25 UTC."],[[["\u003cp\u003eThe \u003ccode\u003eset()\u003c/code\u003e method allows you to override metadata properties of an Element, such as an ImageCollection, using either a dictionary or key-value pairs.\u003c/p\u003e\n"],["\u003cp\u003eIt returns a new Element with the updated properties, leaving the original Element unchanged.\u003c/p\u003e\n"],["\u003cp\u003eYou can retrieve property values using methods like \u003ccode\u003eget()\u003c/code\u003e, \u003ccode\u003egetString()\u003c/code\u003e, \u003ccode\u003egetNumber()\u003c/code\u003e, and \u003ccode\u003egetArray()\u003c/code\u003e, and the \u003ccode\u003etoDictionary()\u003c/code\u003e method provides all properties as a dictionary.\u003c/p\u003e\n"],["\u003cp\u003eWhen using \u003ccode\u003eget()\u003c/code\u003e to retrieve a property value, it's crucial to cast the result to the appropriate data type (e.g., ee.Number, ee.String) for use in further computations.\u003c/p\u003e\n"]]],[],null,["# ee.ImageCollection.set\n\n\u003cbr /\u003e\n\nOverrides one or more metadata properties of an Element.\n\n\u003cbr /\u003e\n\nReturns the element with the specified properties overridden.\n\n| Usage | Returns |\n|---------------------------------|---------|\n| ImageCollection.set`(var_args)` | Element |\n\n| Argument | Type | Details |\n|-----------------|-------------------|-------------------------------------------------------------------------------------------------------------|\n| this: `element` | Element | The Element instance. |\n| `var_args` | VarArgs\\\u003cObject\\\u003e | Either a dictionary of properties, or a vararg sequence of properties, e.g. key1, value1, key2, value2, ... |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// A contrived, empty image collection for simple demonstration.\nvar col = ee.ImageCollection([]);\nprint('Collection without properties', col);\n\n// Set collection properties using a dictionary.\ncol = col.set({\n project_name: 'biomass_tracking',\n project_id: 3,\n plot_ids: ee.Array([7, 11, 20])\n});\n\n// Set collection properties using a series of key-value pairs.\ncol = col.set('project_year', 2018,\n 'rgb_vis', 'false_color');\n\nprint('Collection with properties', col);\n\n// Get a dictionary of collection property keys and values.\nprint('Property keys and values (ee.Dictionary)', col.toDictionary());\n\n// Get the value of a collection property. To use the result of\n// ee.ImageCollection.get in further computation, you need to cast it to the\n// appropriate class, for example, ee.Number(result) or ee.String(result).\nprint('Project ID (ambiguous object)', col.get('project_id'));\n\n// Get the value of a string collection property as an ee.String object.\nprint('Project name (ee.String)', col.getString('project_name'));\n\n// Get the value of a numeric collection property as an ee.Number object.\nprint('Project year (ee.Number)', col.getNumber('project_year'));\n\n// Get the value of an ee.Array collection property as an ee.Array object.\nprint('Plot IDs (ee.Array)', col.getArray('plot_ids'));\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# A contrived, empty image collection for simple demonstration.\ncol = ee.ImageCollection([])\nprint('Collection without properties:', col.getInfo())\n\n# Set collection properties using a dictionary.\ncol = col.set({\n 'project_name': 'biomass_tracking',\n 'project_id': 3,\n 'plot_ids': ee.Array([7, 11, 20])\n})\n\n# Set collection properties using a series of key-value pairs.\ncol = col.set('project_year', 2018,\n 'rgb_vis', 'false_color')\n\nprint('Collection with properties:', col.getInfo())\n\n# Get a dictionary of collection property keys and values.\nprint('Property keys and values (ee.Dictionary):', col.toDictionary().getInfo())\n\n# Get the value of a collection property. To use the result of\n# ee.ImageCollection.get in further computation, you need to cast it to the\n# appropriate class, for example, ee.Number(result) or ee.String(result).\nprint('Project ID (ambiguous object):', col.get('project_id').getInfo())\n\n# Get the value of a string collection property as an ee.String object.\nprint('Project name (ee.String):', col.getString('project_name').getInfo())\n\n# Get the value of a numeric collection property as an ee.Number object.\nprint('Project year (ee.Number):', col.getNumber('project_year').getInfo())\n\n# Get the value of an ee.Array collection property as an ee.Array object.\nprint('Plot IDs (ee.Array):', col.getArray('plot_ids').getInfo())\n```"]]