Comme pour Images, il existe plusieurs façons d'obtenir des informations sur un ImageCollection
. La collection peut être imprimée directement dans la console, mais l'impression de la console est limitée à 5 000 éléments. Les collections de plus de 5 000 images doivent être filtrées avant l'impression. L'impression d'une grande collection sera donc plus lente. L'exemple suivant présente différentes manières d'obtenir des informations sur les collections d'images de manière programmatique:
Éditeur de code (JavaScript)
// Load a Landsat 8 ImageCollection for a single path-row. var collection = ee.ImageCollection('LANDSAT/LC08/C02/T1_TOA') .filter(ee.Filter.eq('WRS_PATH', 44)) .filter(ee.Filter.eq('WRS_ROW', 34)) .filterDate('2014-03-01', '2014-08-01'); print('Collection: ', collection); // Get the number of images. var count = collection.size(); print('Count: ', count); // Get the date range of images in the collection. var range = collection.reduceColumns(ee.Reducer.minMax(), ['system:time_start']) print('Date range: ', ee.Date(range.get('min')), ee.Date(range.get('max'))) // Get statistics for a property of the images in the collection. var sunStats = collection.aggregate_stats('SUN_ELEVATION'); print('Sun elevation statistics: ', sunStats); // Sort by a cloud cover property, get the least cloudy image. var image = ee.Image(collection.sort('CLOUD_COVER').first()); print('Least cloudy image: ', image); // Limit the collection to the 10 most recent images. var recent = collection.sort('system:time_start', false).limit(10); print('Recent images: ', recent);
import ee import geemap.core as geemap
Colab (Python)
# Load a Landsat 8 ImageCollection for a single path-row. collection = ( ee.ImageCollection('LANDSAT/LC08/C02/T1_TOA') .filter(ee.Filter.eq('WRS_PATH', 44)) .filter(ee.Filter.eq('WRS_ROW', 34)) .filterDate('2014-03-01', '2014-08-01') ) display('Collection:', collection) # Get the number of images. count = collection.size() display('Count:', count) # Get the date range of images in the collection. range = collection.reduceColumns(ee.Reducer.minMax(), ['system:time_start']) display('Date range:', ee.Date(range.get('min')), ee.Date(range.get('max'))) # Get statistics for a property of the images in the collection. sun_stats = collection.aggregate_stats('SUN_ELEVATION') display('Sun elevation statistics:', sun_stats) # Sort by a cloud cover property, get the least cloudy image. image = ee.Image(collection.sort('CLOUD_COVER').first()) display('Least cloudy image:', image) # Limit the collection to the 10 most recent images. recent = collection.sort('system:time_start', False).limit(10) display('Recent images:', recent)