ee.ImageCollection.getString

Trích xuất một thuộc tính từ một đối tượng.

Cách sử dụng	Giá trị trả về
ImageCollection.getString(property)	Chuỗi

Đối số	Loại	Thông tin chi tiết
this: object	Phần tử	Tính năng để trích xuất thuộc tính.
property	Chuỗi	Thuộc tính cần trích xuất.

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([])
display('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')

display('Collection with properties:', col)

# Get a dictionary of collection property keys and values.
display('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).
display('Project ID (ambiguous object):', col.get('project_id'))

# Get the value of a string collection property as an ee.String object.
display('Project name (ee.String):', col.getString('project_name'))

# Get the value of a numeric collection property as an ee.Number object.
display('Project year (ee.Number):', col.getNumber('project_year'))

# Get the value of an ee.Array collection property as an ee.Array object.
display('Plot IDs (ee.Array):', col.getArray('plot_ids'))