Bildinformationen und -metadaten

In Google Colab ausführen

Quellcode auf GitHub ansehen

Drucken Sie Bildobjekte aus, um Bandnamen, Projektionsinformationen, Eigenschaften und andere Metadaten zu sehen. In den folgenden Beispielen wird gezeigt, wie Sie alle Bildmetadaten drucken und bestimmte Metadatenelemente programmatisch anfordern.

Metadaten aufrufen

Code-Editor (JavaScript)

// Load an image.
var image = ee.Image('LANDSAT/LC08/C02/T1/LC08_044034_20140318');

// Display all metadata.
print('All metadata:', image);

// Get information about the bands as a list.
var bandNames = image.bandNames();
print('Band names:', bandNames);  // ee.List of band names

// Get projection information from band 1.
var b1proj = image.select('B1').projection();
print('Band 1 projection:', b1proj);  // ee.Projection object

// Get scale (in meters) information from band 1.
var b1scale = image.select('B1').projection().nominalScale();
print('Band 1 scale:', b1scale);  // ee.Number

// Note that different bands can have different projections and scale.
var b8scale = image.select('B8').projection().nominalScale();
print('Band 8 scale:', b8scale);  // ee.Number

// Get a list of all metadata properties.
var properties = image.propertyNames();
print('Metadata properties:', properties);  // ee.List of metadata properties

// Get a specific metadata property.
var cloudiness = image.get('CLOUD_COVER');
print('CLOUD_COVER:', cloudiness);  // ee.Number

// Get version number (ingestion timestamp as microseconds since Unix epoch).
var version = image.get('system:version');
print('Version:', version);  // ee.Number
print('Version (as ingestion date):',
      ee.Date(ee.Number(version).divide(1000)));  // ee.Date

// Get the timestamp and convert it to a date.
var date = ee.Date(image.get('system:time_start'));
print('Timestamp:', date);  // ee.Date

Python einrichten

Auf der Seite Python-Umgebung finden Sie Informationen zur Python API und zur Verwendung von geemap für die interaktive Entwicklung.

import ee
import geemap.core as geemap

Colab (Python)

# Load an image.
image = ee.Image('LANDSAT/LC08/C02/T1/LC08_044034_20140318')

# All metadata.
display('All metadata:', image)

# Get information about the bands as a list.
band_names = image.bandNames()
display('Band names:', band_names)  # ee.List of band names

# Get projection information from band 1.
b1_proj = image.select('B1').projection()
display('Band 1 projection:', b1_proj)  # ee.Projection object

# Get scale (in meters) information from band 1.
b1_scale = image.select('B1').projection().nominalScale()
display('Band 1 scale:', b1_scale)  # ee.Number

# Note that different bands can have different projections and scale.
b8_scale = image.select('B8').projection().nominalScale()
display('Band 8 scale:', b8_scale)  # ee.Number

# Get a list of all metadata properties.
properties = image.propertyNames()
display('Metadata properties:', properties)  # ee.List of metadata properties

# Get a specific metadata property.
cloudiness = image.get('CLOUD_COVER')
display('CLOUD_COVER:', cloudiness)  # ee.Number

# Get version number (ingestion timestamp as microseconds since Unix epoch).
version = image.get('system:version')
display('Version:', version)  # ee.Number
display(
    'Version (as ingestion date):',
    ee.Date(ee.Number(version).divide(1000)).format(),
)  # ee.Date

# Get the timestamp.
ee_date = ee.Date(image.get('system:time_start'))
display('Timestamp:', ee_date)  # ee.Date

# Date objects transferred to the client are milliseconds since UNIX epoch;
# convert to human readable date with ee.Date.format().
display('Datetime:', ee_date.format())  # ISO standard date string